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PRELIMINARY ENGINEERING REPORT
Technical Information Report
Longacres Business Center II
Renton, WA
PREPARED FOR:
Ryan Companies
3900 East Camelback Road, Suite 100
Phoenix, AZ 85018
(602) 322-6100
PREPARED BY:
COUGHLIN PORTER LUNDEEN
801 Second Avenue, Suite 900
Seattle, WA 98104
P 206.343.0460
CONTACT / Jeff Peterson, P.E.
Tim Brockway, P.E.
PRELIMINARY ENGINEERING REPORT
Technical Information Report
Longacres Business Center II
Renton, WA
PREPARED FOR:
Ryan Companies
3900 East Camelback Road, Suite 100
Phoenix, AZ 85018
(602) 322-6100
PREPARED BY:
COUGHLIN PORTER LUNDEEN
801 Second Avenue, Suite 900
Seattle, WA 98104
P 206.343.0460
CONTACT / Tim Brockway, P.E.
Preliminary Drainage Report
Longacres Business Center Phase II
Coughlin Porter Lundeen
Project Number: P15TBB-004
August 21, 2015
TABLE OF CONTENTS
TABLE OF Contents ......................................................................................................................................... 1
LIST OF FIGURES ......................................................................................................................................... 1
LIST OF TABLES ........................................................................................................................................... 1
I. PROJECT OVERVIEW ..................................................................................................................................... 1
General Description .......................................................................................................................................... 1
Existing Conditions ........................................................................................................................................... 1
Proposed Drainage System .............................................................................................................................. 1
II. CONDITIONS AND REQUIREMENTS SUMMARY ........................................................................................ 3
City of Renton Amendments to the King County Surface Water Management Design Manual Core
Requirements: .................................................................................................................................................. 3
Special Requirements: ..................................................................................................................................... 3
Project Specific Requirements: ........................................................................................................................ 4
III. OFF-SITE ANALYSIS ..................................................................................................................................... 5
Task 1 – Study Area Definition and Maps ........................................................................................................ 5
Task 2 - Resource Review ............................................................................................................................... 5
Task 3 - Field Inspection .................................................................................................................................. 5
Task 4 - Drainage System Description and Problem Descriptions ................................................................... 5
Upstream Analysis ........................................................................................................................................ 5
Downstream Analysis ................................................................................................................................... 6
Task 5 – Mitigation of Existing or Potential Problems ...................................................................................... 6
IV. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN ....................................... 7
Existing Site Hydrology (Part A) ....................................................................................................................... 7
Developed Site Hydrology (Part B) ................................................................................................................... 7
Performance Standards and Flow Control System (Parts C and D) ................................................................ 7
Hydrologic modeling method ............................................................................................................................ 8
Water Quality System (Part E) ......................................................................................................................... 9
V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN ..................................................................................... 9
Standard Requirements (based on KCSWDM and SAO): ............................................................................... 9
On-site Conveyance ....................................................................................................................................... 10
Existing Conditions: .................................................................................................................................... 10
Developed Storm system description: ........................................................................................................ 10
Conveyance / Backwater Analysis: ............................................................................................................. 10
VI. SPECIAL REPORTS AND STUDIES .......................................................................................................... 11
VII. OTHER PERMITS ....................................................................................................................................... 12
VIII. CSWPPP ANALYSIS AND DESIGN ......................................................................................................... 13
Standard Requirements .................................................................................................................................. 13
SOUTHPORT HOTEL
IX. BOND QUANTITY, FACILITY SUMMARIES, AND DECLARATION OF COVENANT .............................. 14
X. OPERATION AND MAINTENANCE MANUAL ............................................................................................ 15
Standard Maintenance ................................................................................................................................... 15
Figures .............................................................................................................................................................. 27
Appendix A ....................................................................................................................................................... 28
Appendix B ....................................................................................................................................................... 29
Appendix C ....................................................................................................................................................... 30
LIST OF FIGURES
FIGURE 1 – TIR WORKSHEET
FIGURE 2 – PARCEL CONDITIONS
FIGURE 3 – SITE LOCATION
FIGURE 4 – PROPOSED CONDITIONS
FIGURE 5 – DRAINAGE BASIN MAP
FIGURE 6 – FLOW CONTROL MAP
FIGURE 7 – KING COUNTY IMAP - FLOODPLAIN
FIGURE 8 – CITY OF RENTON SOIL SURVEY MAP
FIGURE 9 – DRAINAGE COMPLAINTS MAP
LIST OF TABLES
TABLE 1 - EXISTING SITE CONDITIONS AREA BREAKDOWN
TABLE 2 - DEVELOPED SITE CONDITIONS AREA BREAKDOWN
TABLE 3 – STORMWATER DETENTION WETPOND
I. PROJECT OVERVIEW
GENERAL DESCRIPTION
The following preliminary Technical Information Report (TIR) provides the technical information and design
analysis required for developing the Drainage Plan and the Temporary Erosion and Sedimentation Control
Plan (TESC) for the Longacres Business Center Phase II. The stormwater design for the project was based on
the Development Agreement and supplemental amendments to that document between the City of Renton
and The Boeing Company. This agreement has adopted the 1990 King County Surface Water Design Manual
(KCSWDM) (See Figure 1 – Technical Information Report Worksheet) as the design standard for this site.
The Longacres Business Center Phase II project is located at SW 27th St and Naches Ave SW in the City of
Renton (See Figure 3 – Site Location). The site is in the NE ¼ of NW ¼ and NW ¼ of NE ¼ of Section 25,
Township 23 North, Range 4 East, Willamette Meridian. The site will occupy lots 088670-0090, -0100, -0150, -
0160, -0180, -0190, and -0380 for a total of 15.96 acres.
Overall, the project will include a 3-story 50,000 square-foot building and a 4-story 39,000 square-foot building
and general site improvements including landscaping, a temporary surface parking area, and a perimeter fire
lane. The existing site consists of 2.14 acres of impervious area and 13.82 acres of pervious area. The
proposed conditions will consist of approximately 12.09 acres of impervious area and 3.87 acres of pervious
area. Soils for the area were mapped using the King County Soil Survey maps (See Figure 8 – Soil Survey
Map).
This project proposes to construct a drainage system with a new network of underground pipes, catch basins,
curbs and gutter, to collect surface water runoff throughout the site and direct it to a detention wetpond for
water quality treatment and detention. Runoff from the site will be discharged to the north, into the previously
developed Longacres Office Park drainage system within the Boeing property. From here the drainage flows
into Springbrook Creek and ultimately the Duwamish River.
EXISTING CONDITIONS
The existing site consists of gravel roads and asphalt areas as well as open grassy areas. The existing site
consists of mostly open grassy areas as well as some remaining asphalt and gravel areas. See Table 1 for site
surface cover information. The site was previously home to the Longacres Race Track outbuilding stable and
support services area, which was demolished during the development of the Longacres Office Park. Minimal
conveyance systems exist within the project site area. However, the existing pond system is located to the
north.
PROPOSED DRAINAGE SYSTEM
This project proposed to construct a drainage system with a new network of underground pipes, catch basins,
curbs and gutter, to collect surface water runoff throughout the site and direct it to a detention wetpond located
LONGACRES BUSINESS CENTER PHASE II 2
on Boeing’s Tract B for both water quality treatment and detention. Water quality will be provided with a
permanent wetpond below the required live storage. The runoff will leave the site at the pre-developed rates or
less through an outlet in the wetpond and discharge into the South Pond on the Boeing site.
Conveyance for the site will be a combination of closed 12-inch to 24-inch pipes and sheet flow. Storm water
runoff from the parking areas will be captured by a series of catch basins and routed beneath the Seattle
waterline right of way at the site’s northern edge into the wetpond in Tract B. All conveyance on site will be
designed according to Chapter 4 of the City of Renton Amendments to the KCSWDM.
LONGACRES BUSINESS CENTER PHASE II 3
II. CONDITIONS AND REQUIREMENTS SUMMARY
This section will address the requirements set forth by the Core and Special Requirements listed in Chapter 1
of the City of Renton’s Amendments to the King County Surface Water Design Manual.
CITY OF RENTON AMENDMENTS TO THE KING COUNTY SURFAC E
WATER MANAGEMENT DESIGN MANUAL CORE REQUIREMENTS:
1. Discharge at the Natural Location (1.2.1): All runoff from the site will be conveyed to the natural
discharge location (existing wetlands located at Tract B).
2. Off-site Analysis (1.2.2): Refer to Sections III and IV. A Level 1 downstream analysis has been
performed.
3. Flow Control (1.2.3.1): Refer to Section IV. The project is required to comply with the 1990
KCSWDM per the Development Agreement for the Longacres Office Park.
4. Conveyance System (1.2.4): Refer to Section V. Closed pipe systems have been provided for on-
site stormwater conveyance.
5. Erosion and Sedimentation Control (1.2.5): Refer to Section VIII. The project will construct a series
of sediment controls to address the specific conditions at the site.
6. Maintenance and Operations (1.2.6): Refer to Section X. The proposed storm drainage system will
be owned, operated and maintained by the owner. The wetpond in Tract B will be owned by the
Boeing Company with maintenance provided per an agreement to be developed between Boeing and
this project’s owner.
7. Financial Guarantees and Liability (1.2.7): The owner and contractor will obtain all necessary
permits and bonds prior to the beginning of construction.
8. Water Quality (1.2.8): Refer to Section IV.E. Water quality treatment for runoff from target pollution
generating surfaces will be provided by a wet detention pond in accordance with the 1990 King
County Surface Water Design Manual. In lieu of adding a biofiltration system to the water quality
control measures, a 50% Factor of Safety was added to the wetpool volume by request from the City
of Renton. Water quality treatment for runoff from target pollution generating surfaces that cannot be
captured by the site’s conveyance system and routed to the wetpond will be provided by a cartridge
system meeting the City of Renton’s requirements.
SPECIAL REQUIREMENTS:
Special Requirement #1. Other Adopted Area-Specific Requirements Section 1.3.1
· Critical Drainage Areas (CDAs): Not Applicable
· Master Drainage Plans (MDPs): The Development Agreement in place for the Longacres Office Park
governs drainage requirements for this property.
· Basin Plans (BPs): The project is located within Black River Drainage Basin.
· Lake Management Plans(LMPs): Not Applicable
LONGACRES BUSINESS CENTER PHASE II 4
· Shared Facility Drainage Plans(SFDPs): Not Applicable
· Salmon Conservation Plans (SCPs): Not Applicable
· Flood Hazard Reduction Plan Updates (FHRPs):
Special Requirement #2. Flood Hazard Area Delineation, Section 1.3.2: See Figure 7 for 100-yr flood zone.
Filling is planned for within the 100-yr flood zone. Compensatory volume is being provided in the footprint of
the combination wetpond in Tract B, at the elevations above the overflow detention line.
Special Requirement #3. Flood Protection Facilities, Section 1.3.3: Not Applicable
Special Requirement #4. Source Controls, Section 1.3.4: An Activity Worksheet and Required BMP’s will be
provided in the TIR at time of full permit application.
Special Requirement #5. Oil Control: Minimal traffic is anticipated in this area. No oil control is required.
Special Requirement #6. Aquifer Projection Area: Project is not within an Aquifer Projection Area Zone.
Special Requirement #5. Special Water Quality Controls: 50% increase in wetpond volume in lieu of
biofiltration.
PROJECT SPECIFIC REQUIREMENTS:
There are no additional requirements for this portion of the project. Design and construction will abide by
requirements set forth in these documents.
LONGACRES BUSINESS CENTER PHASE II 5
III. OFF-SITE ANALYSIS
TASK 1 – STUDY AREA DEFINITION AND MAPS
The Renton drainage basin map was used to verify that the site was fully in the Black River drainage basin
(See Figure 4 – Drainage Basin Map).
TASK 2 - RESOURCE REVIEW
a) Adopted Basin Plans Black River Drainage Basin
b) Floodplain/floodway (FEMA) Maps Site is not located in the floodplain (See Figure 7)
c) Off-site Analysis Reports N/A
d) Sensitive Areas Folio See Figures 7 – King County iMAP
e) Drainage Complaints and Studies See Figure 9
f) Road Drainage Problems N/A
g) King County Soils Survey: See Figure 8 – City of Renton Soil Survey Map
h) Wetland Inventory Maps: No Wetlands present on site
i) Migrating Rivers Study N/A
j) DOE’s Section 303d List of Polluted Waters
k) KC Designated Water Quality Problems No WQ Problems
l) City of Renton critical maps: 100-year floodplain extents shown in topo survey.
TASK 3 - FIELD INSPECTION
Site visits have been made to gather information including an analysis of the discharge from the site. Please
refer to Task 4, Downstream Analysis below for more information.
TASK 4 - DRAINAGE SYSTEM DESCRIPTION AND PROBLEM
DESCRIPTIONS
Runoff from the site will be conveyed to a new combination wetpond in Tract B to the north, then into an
existing storm system that discharges directly to the south pond in the Boeing property. This site’s runoff will
be treated and detained in the combination wetpond being constructed with this project. From there the runoff
connects into the Boeing property’s drainage system, Springbrook Creek and ultimately the Duwamish River.
Upstream Analysis
The site is within the Black River and specifically the Springbrook Creek drainage basin. This site is located
generally at the high point of the area topography, with a limited area of train track embankment to the west
that drains onto this site perimeter. Runoff from this area will be directed north or south as it currently does
into offsite areas. To the east is Oakesdale Avenue which is improved and provides no runoff to the site. To
the south is the 27th Street corridor which is mostly below the site in the western and eastern portions, with a
limited area at the intersection with the site driveway that may end up draining towards this project.
LONGACRES BUSINESS CENTER PHASE II 6
Downstream Analysis
The site discharges to the managed stormwater system within the Boeing property which was constructed in
anticipation of receiving runoff from this site. That system drains to Springbrook Creek in accordance with the
Development Agreement and associated Master Drainage Plan for the Longacres Office Park that was
previously permitted by the City and State. Springbrook Creek in turn drains to the Black River and ultimately
the Duwamish River and Puget Sound.
TASK 5 – MITIGATION OF EXISTING OR POTENTIAL PROBLE MS
Boeing is currently doing an assessment of their internal drainage systems with the intent of determining if it
may be possible to accommodate undetained runoff from this project in lieu of constructing the detention in
Tract B. The results of that analysis are expected to be known prior to permit submittal for this project.
LONGACRES BUSINESS CENTER PHASE II 7
IV. FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS
AND DESIGN
EXISTING SITE HYDROLOGY (PART A)
The existing site totals 15.96 acres and consists of existing asphalt and gravel roads and grassed fields. The
site generally slopes to the north with drainage described in Section III Downstream Analysis. These
conditions are summarized in Table 1 below.
TABLE 1 - EXISTING SITE CONDITIONS AREA BREAKDOWN
LAND COVER AREA (ACRES) DESCRIPTION
Impervious Area 2.14 acres Gravel road
Pervious& Landscape 13.82 acres Grass field
Total Project Area 15.96 acres Total site area
Percentage of Impervious Area 34%
DEVELOPED SITE HYDROLOGY (PART B)
The developed site hydrology will increase the amount of impervious area by approximately 8.93 acres. A
summary of the basin information is shown in Table 2.
TABLE 2 - DEVELOPED SITE CONDITIONS AREA BREAKDOWN
LAND COVER AREA (ACRES) DESCRIPTION
Impervious Area 11.07 acres Building roof, parking areas, drive aisles, fire lane
Pervious & Landscape 4.89 acres Associated landscaping, undisturbed areas
Total Project Area 15.96 acres Total site area
Percentage of Impervious Area 69%
PERFORMANCE STANDARDS AND FLOW CONTROL SYSTEM (PART S
C AND D)
According to Section 1.2.3.1 (and the Flow Control Basin Map) of the City of Renton Amendments to the
KCSWM, this project is located within the Peak Flow Control area. However, since this project is within the
LONGACRES BUSINESS CENTER PHASE II 8
area covered by the Development Agreement for the Longacres Office Park, detention standards are required
to meet the 1990 King County SWDM criteria.
HYDROLOGIC MODELING METHOD
Hydrologic analysis was performed using the computer-modeling program StormSHED3G™, Assembly
Version 10.0.5666.34827, using the Santa Barbara Urban Hydrograph (SBUH) methodology. The program
models pre-developed and developed runoff conditions using hydrographs for each basin. The computer
model parametrically calculates the peak rates and total volumes to produce runoff hydrographs based on
characters of the basin (i.e. area, curve number (CN), time of concentration (Tc), etc.). The StormSHED
software program enables users to propose conveyance system and/or detention facility to route the
hydrographs generated from the basin analysis through. The modeled peak flows and volumes were used in
the analysis of the proposed drainage system and to size the flow control outlet structure and detention
wetpond.
For the proposed project, the 2-year, 10-year, and 100-year, 24-hour design storm events were analyzed in
accordance with the King County requirements. The proposed system was developed to mitigate peak runoff
rates with one detention wetpond to serve the site. The calculated detention facility volume capacity was
increased by 30% for the 2-year and 10-year storm events, in accordance with the 2009 KC-SWDM Section
1.2.3.
The design volume for the live storage in the wetpond, according to the size of the development is 57,757 CF.
A detention pond with dimensions of 130’x130’x10’ and 3:1 side slopes was used in the StormSHED for the
calculations. The following table summarizes the resulting detention volumes for different rainfall events:
RAINFALL EVENT VOLUME (CF)
2 year 20,779
10 year 31,752
100 year 44,428
The constructed detention wetpond will contain two cells, in accordance with 2009 KC-SWDM Section 6.4.1.2.
The two celled pond was modeled as a single unit in StormSHED due to both ponds being hydraulically
connected through a berm, in accordance with the 2009 KC-SWDM. The design volume for the live storage
will be increased by a factor of safety of 30%. The required volume calculated by StormSHED is 44,429 CF
and the required volume, including the Factor of Safety, is 57,757 CF.
LONGACRES BUSINESS CENTER PHASE II 9
WATER QUALITY SYSTEM (PART E)
The wetpond must contain a Dead Storage volume equal to or greater than1/3 of the precipitation value of the
2-year, 24-hour event, equaling 23,612 CF, utilizing the 1990 KC-SWDM design criteria. In lieu of a biofiltration
swale, an additional 50% factor of safety was incorporated into the Dead Storage volume, in accordance with
the Development Agreement. The required Dead Storage volume must be equal or greater than 35,418 CF.
The pond design submitted for permit after this initial Site Approval submittal will include the breakout of the
cell geometry, though at this time our plans do not yet reflect this. The design surface area at elevation
24,128.5 SF, in accordance with the 1990 KC-SWDM Section 1.3.5, which states the surface area at the top of
the dead storage must be equal to 1% of the impervious area contributing to the detention wetpond. The
required surface area is 4,826 SF.
The following table summarizes the Pre-Developed and Post-Developed runoff peak rates for the wet
detention pond:
TABLE 3 – STORMWATER DETENTION WETPOND
RAINFALL
EVENT
PRE-DEVELOPED SITE
(CFS)
DEVELOPED SITE
(CFS)
RELEASE RATES
(CFS)
2 year 1.406 5.4632 1.405
10 year 2.9927 8.5904 2.9937
100 year 5.1051 12.3639 5.1043
V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN
This section discusses the criteria that will be used to analyze and design the proposed storm conveyance
system.
STANDARD REQUIREMENTS (BASED ON KCSWDM AND SAO):
1. Facilities must convey the 100-year flow without overtopping the crown of the roadway,
flooding buildings, and if sheet flow occurs it must pass through a drainage easement. All
stormwater conveyance has been designed such that the 100-year flow is conveyed without
overtopping the crown of the roadway (or drive aisle) or flooding any building.
2. New pipe systems and culverts must convey the 25-year flow with at least 0.5 feet of
freeboard. (1.2.4-1). The new pipe systems have been designed to convey the 25-year flow with at
least 0.5 feet of freeboard.
LONGACRES BUSINESS CENTER PHASE II 10
3. Bridges must convey the 100-year flow and provide a minimum of two feet, varying up to six
feet, of clearance based on 25% of the mean channel width. (1.2.4-2)(4.3.5-6). N/A. This project
does not propose a bridge.
4. Drainage ditches must convey the 25-year flow with 0.5 feet of freeboard and the 100-year flow
without overtopping. (1.2.4-2). N/A This project does not propose a drainage ditch.
5. Floodplain Crossings must not increase the base flood elevation by more than 0.01 feet
[41(83.C)] and shall not reduce the flood storage volume [37(82.A)]. Piers shall not be
constructed in the FEMA floodway. [41(83.F.1)]. No work is being proposed within the base flood
elevation or within the FEMA floodway.
6. Stream Crossings shall require a bridge for class 1 streams that does not disturb or banks. For
type 2 and type 3 steams, open bottom culverts or other method may be used that will not
harm the stream or inhibit fish passage. [60(95.B)]. There are no new stream (river) crossings
associated with the construction of this project.
7. Discharge at natural location is required and must produce no significant impacts to the
downstream property (1.2.1-1). The project will discharge to the existing storm system.
ON-SITE CONVEYANCE
Existing Conditions:
Runoff from the existing site is generally conveyed as sheet flow to the north into the Master Drainage Plan
designed pond in the Boeing site.
Developed Storm system description:
Runoff from the building roof will be collected into roof drains and routed directly to the detention wetpond via
pipe flow. Site runoff will generally be collected by catch basins and trench drains before being routed to the
detention wetpond.
Conveyance / Backwater Analysis:
A preliminary conveyance analysis has been performed on each sub-basin within the site, per the King County
Surface Water Design Manual . See Appendix A for more information.
LONGACRES BUSINESS CENTER PHASE II 11
VI. SPECIAL REPORTS AND STUDIES
Geotechnical Report – Longacres Phase II, SW 27th Avenue and Naches Avenue SW Renton, Washington,
dated May 19th, 2015; By Terra Associates, Inc. See Appendix B.
LONGACRES BUSINESS CENTER PHASE II 12
VII. OTHER PERMITS
This project will require building and demolition permits from the City of Renton and a CSWPPP. The Permit
submittal TIR will contain this information in Section 8 for the CSWPPP.
LONGACRES BUSINESS CENTER PHASE II 13
VIII. CSWPPP ANALYSIS AND DESIGN
This section lists the requirements that will be used when designing the TESC plan for this site. A copy of the
SWPPP will be included in Appendix C at time of Permit submittal.
STANDARD REQUIREMENTS
Erosion/Sedimentation Plan shall include the following:
1. Facilities required include: Catch basin filter socks. (1.2.5-1). The project will provide sediment
protection at existing and proposed catch basins.
2. Timing - For the period between November 1 through March 1 disturbed areas greater than
5,000 square feet left undisturbed for more than 12 hours must be covered with mulch,
sodding, or plastic covering. A construction phasing plan shall be provided to ensure that
erosion control measures are installed prior to clearing and grading. (1.2.5-1). The TESC plan
will include provisions for disturbed areas to be covered in accordance with City of Renton
requirements and that all TESC measures are in place before any construction activity occurs.
3. Planning - Plan shall limit tributary drainage to an area to be cleared and graded. Delineate
dimension, stake and flag clearing limits (1.2.5-1). The clearing limits will be indicated on the
TESC plan.
4. Revegetation - Revegetate areas to be cleared as soon as practicable after grading. (1.2.5-1).
Notes addressing this item will be included on the TESC plan.
LONGACRES BUSINESS CENTER PHASE II 14
IX. BOND QUANTITY, FACILITY SUMMARIES, AND DECLARATION
OF COVENANT
A Bond Quantity Worksheet, if required, is not included at this time.
A Water Quality Facility Summary Sheet outlining the proposed water quality system will be submitted
following approval of the plans, if required.
Any required Declarations of Covenant, if required, will be included prior to issuance of the permit.
LONGACRES BUSINESS CENTER PHASE II 15
X. OPERATION AND MAINTENANCE MANUAL
STANDARD MAINTENANCE
Per standards set forth in the King County Surface Water Design Manual, the owner will maintain facilities.
Sections of the King County Storm Water Management Design Manual outlining the Operations and
Maintenance of these facilities have been included in this section on the following pages.
LONGACRES BUSINESS CENTER PHASE II 16
MAINTENANCE STANDARDS FOR
PRIVATELY MAINTAINED DRAINAGE
FACILITIES AT LONGACRES BUSINESS
CENTER PHASE II
NO. 1 – DETENTION PONDS
Maintenance
Component
Defect or Problem Conditions When Maintenance Is Needed Results Expected When
Maintenance Is Performed
Site Trash and debris Any trash and debris which exceed 1 cubic
foot per 1,000 square feet (this is about
equal to the amount of trash it would take to
fill up one standard size office garbage
can). In general, there should be no visual
evidence of dumping.
Trash and debris cleared from site.
Noxious weeds Any noxious or nuisance vegetation which
may constitute a hazard to County
personnel or the public.
Noxious and nuisance vegetation
removed according to applicable
regulations. No danger of
noxious vegetation where County
personnel or the public might
normally be.
Contaminants and
pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or
paint.
Materials removed and disposed
of according to applicable
regulations. Source control BMPs
implemented if appropriate. No
contaminants present other than
a surface oil film.
Grass/groundcover Grass or groundcover exceeds 18 inches in
height.
Grass or groundcover mowed to a
height no greater than 6 inches.
Top or Side
Slopes of Dam,
Berm or
Embankment
Rodent holes Any evidence of rodent holes if facility is
acting as a dam or berm, or any evidence of
water piping through dam or berm via rodent
holes.
Rodents removed or destroyed
and dam or berm repaired.
Tree growth Tree growth threatens integrity of slopes,
does not allow maintenance access, or
interferes with maintenance activity. If trees
are not a threat or not interfering with
access or maintenance, they do not need to
be removed.
Trees do not hinder facility
performance or maintenance
activities.
Erosion Eroded damage over 2 inches deep where
cause of damage is still present or where
there is potential for continued erosion. Any
erosion observed on a compacted slope.
Slopes stabilized using
appropriate erosion control
measures. If erosion is occurring
on compacted slope, a licensed
civil engineer should be consulted
to resolve source of erosion.
Settlement Any part of a dam, berm or embankment that
has settled 4 inches lower than the design
elevation.
Top or side slope restored to
design dimensions. If settlement
is significant, a licensed civil
engineer should be consulted to
determine the cause of the
settlement.
LONGACRES BUSINESS CENTER PHASE II 17
Storage Area Sediment
accumulation
Accumulated sediment that exceeds 10% of
the designed pond depth.
Sediment cleaned out to designed
pond shape and depth; pond
reseeded if necessary to control
erosion.
Liner
damaged (If
Applicable)
Liner is visible or pond does not hold water
as designed.
Liner repaired or replaced.
Inlet/Outlet Pipe. Sediment
accumulation
Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment.
Trash and debris Trash and debris accumulated in inlet/outlet
pipes (includes floatables and non-
floatables).
No trash or debris in pipes.
Damaged Cracks wider than ½-inch at the joint of the
inlet/outlet pipes or any evidence of soil
entering at the joints of the inlet/outlet pipes.
No cracks more than ¼-inch wide
at the joint of the inlet/outlet pipe.
Emergency
Overflow/Spillway
Tree growth Tree growth impedes flow or threatens stability
of spillway.
Trees removed.
Rock missing Only one layer of rock exists above native soil
in area five square feet or larger or any
exposure of native soil on the spillway.
Spillway restored to design
standards.
NO. 4 – CONTROL STRUCTURE/FLOW RESTRICTOR
Maintenance
Component
Defect or
Problem
Condition When Maintenance is Needed Results Expected When
Maintenance is Performed
Structure Trash and debris Trash or debris of more than ½ cubic foot which
is located immediately in front of the structure
opening or is blocking capacity of the structure
by more than 10%.
No Trash or debris blocking or
potentially blocking entrance to
structure.
Trash or debris in the structure that exceeds 1/ 3
the depth from the bottom of basin to invert the
lowest pipe into or out of the basin.
No trash or debris in the structure.
Deposits of garbage exceeding 1 cubic foot in
volume.
No condition present which would
attract or support the breeding of
insects or rodents.
Sediment Sediment exceeds 60% of the depth from the
bottom of the structure to the invert of the lowest
pipe into or out of the structure or the bottom of
the FROP-T section or is within 6 inches of the
invert of the lowest pipe into or out of the
structure or the bottom of the FROP-T section.
Sump of structure contains no
sediment.
Damage to
frame and/or
top slab
Corner of frame extends more than ¾ inch past
curb face into the street (If applicable).
Frame is even with curb.
Top slab has holes larger than 2 square inches
or cracks wider than ¼ inch.
Top slab is free of holes and cracks.
Frame not sitting flush on top slab, i.e.,
separation of more than ¾ inch of the frame
from the top slab.
Frame is sitting flush on top slab.
Cracks in walls
or bottom
Cracks wider than ½ inch and longer than 3
feet, any evidence of soil particles entering
structure through cracks, or maintenance
person judges that structure is unsound.
Structure is sealed and structurally
sound.
LONGACRES BUSINESS CENTER PHASE II 18
Cracks wider than ½ inch and longer than 1 foot
at the joint of any inlet/outlet pipe or any
evidence of soil particles entering structure
through cracks.
No cracks more than 1/ inch wide at 4
the joint of inlet/outlet pipe.
Settlement/
misalignment
Structure has settled more than 1 inch or has
rotated more than 2 inches out of alignment.
Basin replaced or repaired to design
standards.
Damaged pipe
joints
Cracks wider than ½-inch at the joint of the
inlet/outlet pipes or any evidence of soil entering
the structure at the joint of the inlet/outlet pipes.
No cracks more than ¼-inch wide at
the joint of inlet/outlet pipes.
Contaminants
and pollution
Any evidence of contaminants or pollution such
as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of
according to applicable regulations.
Source control BMPs implemented if
appropriate. No contaminants
present other than a surface oil film.
Ladder rungs
missing or
unsafe
Ladder is unsafe due to missing rungs,
misalignment, rust, cracks, or sharp edges.
Ladder meets design standards and
allows maintenance person safe
access.
FROP-T Section Damage T section is not securely attached to structure
wall and outlet pipe structure should support at
least 1,000 lbs of up or down pressure.
T section securely attached to wall
and outlet pipe.
Structure is not in upright position (allow up to
10% from plumb).
Structure in correct position.
Connections to outlet pipe are not watertight or
show signs of deteriorated grout.
Connections to outlet pipe are water
tight; structure repaired or replaced
and works as designed.
Any holes—other than designed holes—in the
structure.
Structure has no holes other than
designed holes.
Cleanout Gate Damaged or
missing
Cleanout gate is missing. Replace cleanout gate.
Cleanout gate is not watertight. Gate is watertight and works as
designed.
Gate cannot be moved up and down by one
maintenance person.
Gate moves up and down easily and
is watertight.
Chain/rod leading to gate is missing or damaged. Chain is in place and works as
designed.
Orifice Plate Damaged or
missing
Control device is not working properly due to
missing, out of place, or bent orifice plate.
Plate is in place and works as
designed.
Obstructions Any trash, debris, sediment, or vegetation
blocking the plate.
Plate is free of all obstructions and
works as designed.
Overflow Pipe Obstructions Any trash or debris blocking (or having the
potential of blocking) the overflow pipe.
Pipe is free of all obstructions and
works as designed.
Deformed or
damaged lip
Lip of overflow pipe is bent or deformed. Overflow pipe does not allow
overflow at an elevation lower than
design
Inlet/Outlet Pipe Sediment
accumulation
Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment.
Trash and debris Trash and debris accumulated in inlet/outlet
pipes (includes floatables and non-floatables).
No trash or debris in pipes.
Damaged Cracks wider than ½-inch at the joint of the
inlet/outlet pipes or any evidence of soil entering
at the joints of the inlet/outlet pipes.
No cracks more than ¼-inch wide at
the joint of the inlet/outlet pipe.
LONGACRES BUSINESS CENTER PHASE II 19
Metal
Grates (If
Applicable)
Unsafe grate
opening
Grate with opening wider than 7/ inch. 8 Grate opening meets design
standards.
Trash and debris Trash and debris that is blocking more than
20% of grate surface.
Grate free of trash and debris.
footnote to guidelines for disposal
Damaged or
missing
Grate missing or broken member(s) of the grate. Grate is in place and meets design
standards.
Manhole Cover/
Lid
Cover/lid not in
place
Cover/lid is missing or only partially in place.
Any open structure requires urgent
maintenance.
Cover/lid protects opening to
structure.
Locking
mechanism Not
Working
Mechanism cannot be opened by one
maintenance person with proper tools. Bolts
cannot be seated. Self-locking cover/lid does not
work.
Mechanism opens with proper tools.
Cover/lid
difficult to
Remove
One maintenance person cannot remove
cover/lid after applying 80 lbs. of lift.
Cover/lid can be removed and
reinstalled by one maintenance
person.
NO. 5 – CATCH BASINS AND MANHOLES
Maintenance
Component
Defect or Problem Condition When Maintenance is Needed Results Expected When
Maintenance is Performed
Structure Sediment Sediment exceeds 60% of the depth from the
bottom of the catch basin to the invert of the
lowest pipe into or out of the catch basin or is
within 6 inches of the invert of the lowest pipe
into or out of the catch basin.
Sump of catch basin contains no
sediment.
Trash and debris Trash or debris of more than ½ cubic foot which
is located immediately in front of the catch basin
opening or is blocking capacity of the catch
basin by more than 10%.
No Trash or debris blocking or
potentially blocking entrance to
catch basin.
Trash or debris in the catch basin that exceeds 1/ the depth from the bottom of basin to invert the 3
lowest pipe into or out of the basin.
No trash or debris in the catch basin.
Dead animals or vegetation that could generate
odors that could cause complaints or
dangerous gases (e.g., methane).
No dead animals or vegetation
present within catch basin.
Deposits of garbage exceeding 1 cubic foot in
volume.
No condition present which would
attract or support the breeding of
insects or rodents.
Damage to
frame and/or top
slab
Corner of frame extends more than ¾ inch past
curb face into the street (If applicable).
Frame is even with curb.
Top slab has holes larger than 2 square inches
or cracks wider than ¼ inch.
Top slab is free of holes and cracks.
Frame not sitting flush on top slab, i.e.,
separation of more than ¾ inch of the frame
from the top slab.
Frame is sitting flush on top slab.
Cracks in walls
or bottom
Cracks wider than ½ inch and longer than 3
feet, any evidence of soil particles entering
catch basin through cracks, or maintenance
person judges that catch basin is unsound.
Catch basin is sealed and
structurally sound.
LONGACRES BUSINESS CENTER PHASE II 20
Cracks wider than ½ inch and longer than 1 foot
at the joint of any inlet/outlet pipe or any
evidence of soil particles entering catch basin
through cracks.
No cracks more than 1/ inch wide at 4
the joint of inlet/outlet pipe.
Settlement/
misalignment
Catch basin has settled more than 1 inch or has
rotated more than 2 inches out of alignment.
Basin replaced or repaired to design
standards.
Damaged pipe
joints
Cracks wider than ½-inch at the joint of the
inlet/outlet pipes or any evidence of soil entering
the catch basin at the joint of the inlet/outlet
pipes.
No cracks more than ¼-inch wide at
the joint of inlet/outlet pipes.
Contaminants
and pollution
Any evidence of contaminants or pollution such
as oil, gasoline, concrete slurries or paint.
Materials removed and disposed of
according to applicable regulations.
Source control BMPs implemented if
appropriate. No contaminants
present other than a surface oil film.
Inlet/Outlet Pipe Sediment
accumulation
Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment.
Trash and debris Trash and debris accumulated in inlet/outlet
pipes (includes floatables and non-floatables).
No trash or debris in pipes.
Damaged Cracks wider than ½-inch at the joint of the
inlet/outlet pipes or any evidence of soil entering
at the joints of the inlet/outlet pipes.
No cracks more than ¼-inch wide at
the joint of the inlet/outlet pipe.
Metal Grates
(Catch
Basins)
Unsafe grate
opening
Grate with opening wider than 7/ inch. 8 Grate opening meets design
standards.
Trash and debris Trash and debris that is blocking more than
20% of grate surface.
Grate free of trash and debris.
footnote to guidelines for disposal
Damaged or
missing
Grate missing or broken member(s) of the grate.
Any open structure requires urgent
maintenance.
Grate is in place and meets design
standards.
Manhole
Cover/Lid
Cover/lid not in
place
Cover/lid is missing or only partially in place.
Any open structure requires urgent
maintenance.
Cover/lid protects opening to
structure.
Locking
mechanism Not
Working
Mechanism cannot be opened by one
maintenance person with proper tools. Bolts
cannot be seated. Self-locking cover/lid does not
work.
Mechanism opens with proper tools.
Cover/lid difficult
to Remove
One maintenance person cannot remove
cover/lid after applying 80 lbs. of lift.
Cover/lid can be removed and
reinstalled by one maintenance
person.
NO. 6 – CONVEYANCE PIPES AND DITCHES
Maintenance
Component
Defect or Problem Conditions When Maintenance is
Needed
Results Expected When
Maintenance is Performed
Pipes Sediment &
debris
accumulation
Accumulated sediment or debris that
exceeds 20% of the diameter of the pipe.
Water flows freely through pipes.
Vegetation/roots Vegetation/roots that reduce free
movement of water through pipes.
Water flows freely through pipes.
LONGACRES BUSINESS CENTER PHASE II 21
Contaminants
and pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or
paint.
Materials removed and
disposed of according to
applicable regulations. Source
control BMPs implemented if
appropriate. No contaminants
present other than a surface oil
film.
Damage to
protective
coating or
corrosion
Protective coating is damaged; rust or
corrosion is weakening the structural
integrity of any part of pipe.
Pipe repaired or replaced.
Damaged Any dent that decreases the cross section
area of pipe by more than 20% or is
determined to have weakened structural
integrity of the pipe.
Pipe repaired or replaced.
Ditches Trash and debris Trash and debris exceeds 1 cubic foot per
1,000 square feet of ditch and slopes.
Trash and debris cleared from
ditches.
Sediment
accumulation
Accumulated sediment that exceeds 20%
of the design depth.
Ditch cleaned/flushed of all
sediment and debris so that it
matches design.
Noxious weeds Any noxious or nuisance vegetation
which may constitute a hazard to County
personnel or the public.
Noxious and nuisance
vegetation removed according
to applicable regulations. No
danger of noxious vegetation
where County personnel or the
public might normally be.
Contaminants
and pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or
paint.
Materials removed and
disposed of according to
applicable regulations. Source
control BMPs implemented if
appropriate. No contaminants
present other than a surface oil
film.
Vegetation Vegetation that reduces free movement of
water through ditches.
Water flows freely through
ditches.
Erosion damage
to slopes
Any erosion observed on a ditch slope. Slopes are not eroding.
Rock lining out of
place or missing
(If Applicable)
One layer or less of rock exists above
native soil area 5 square feet or more, any
exposed native soil.
Replace rocks to design
standards.
NO. 7 – DEBRIS BARRIERS
Maintenance
Component
Defect or Problem Condition When Maintenance is Needed Results Expected When
Maintenance is Performed.
Site Trash and debris Trash or debris plugging more than 20% of
the area of the barrier.
Barrier clear to receive capacity
flow.
Sediment
accumulation
Sediment accumulation of greater than 20%
of the area of the barrier
Barrier clear to receive capacity
flow.
Structure Cracked broken or
loose
Structure which bars attached to is damaged
- pipe is loose or cracked or concrete
structure is cracked, broken of loose.
Structure barrier attached to is
sound.
Bars Bar spacing Bar spacing exceeds 6 inches. Bars have at most 6 inche spacing.
LONGACRES BUSINESS CENTER PHASE II 22
Damaged or
missing bars
Bars are bent out of shape more than 3 inches. Bars in place with no bends more
than ¾ inch.
Bars are missing or entire barrier missing. Bars in place according to design.
Bars are loose and rust is causing 50%
deterioration to any part of barrier.
Repair or replace barrier to
design standards.
NO. 8 – ENERGY DISSIPATERS
Maintenance
Component
Defect or Problem Conditions When Maintenance is Needed Results Expected When
Maintenance is Performed.
Site Trash and debris Trash and/or debris accumulation. Dissipater clear of trash and/or
debris.
Contaminants and
pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or
paint.
Materials removed and disposed
of according to applicable
regulations. Source control BMPs
implemented if appropriate. No
contaminants present other than
a surface oil film.
Rock Pad Missing or moved
Rock
Only one layer of rock exists above native soil
in area five square feet or larger or any
exposure of native soil.
Rock pad prevents erosion.
Dispersion Trench Pipe plugged with
sediment
Accumulated sediment that exceeds 20% of
the design depth.
Pipe cleaned/flushed so that it
matches design.
Not discharging
water properly
Visual evidence of water discharging at
concentrated points along trench (normal
condition is a “sheet flow” of water along
trench).
Water discharges from feature by
sheet flow.
Perforations plugged. Over 1/4 of perforations in pipe are plugged
with debris or sediment.
Perforations freely discharge flow.
Water flows out top
of “distributor”
catch basin.
Water flows out of distributor catch basin
during any storm less than the design storm.
No flow discharges from
distributor catch basin.
Receiving area
over- saturated
Water in receiving area is causing or has
potential of causing landslide problems.
No danger of landslides.
Gabions Damaged mesh Mesh of gabion broken, twisted or deformed
so structure is weakened or rock may fall
out.
Mesh is intact, no rock missing.
Corrosion Gabion mesh shows corrosion through more
than
¼ of its gage.
All gabion mesh capable of
containing rock and retaining
designed form.
Collapsed or
deformed baskets
Gabion basket shape deformed due to any
cause.
All gabion baskets intact,
structure stands as designed.
Missing rock Any rock missing that could cause gabion to
loose structural integrity.
No rock missing.
Manhole/Chamber Worn or damaged
post, baffles or side
of chamber
Structure dissipating flow deteriorates to ½
or original size or any concentrated worn
spot exceeding one square foot which would
make structure unsound.
Structure is in no danger of failing.
Damage to wall,
frame, bottom,
and/or top slab
Cracks wider than ½-inch or any evidence of
soil entering the structure through cracks, or
maintenance inspection personnel
determines that the structure is not
structurally sound.
Manhole/chamber is sealed and
structurally sound.
LONGACRES BUSINESS CENTER PHASE II 23
Damaged pipe joints Cracks wider than ½-inch at the joint of the
inlet/outlet pipes or any evidence of soil
entering the structure at the joint of the
inlet/outlet pipes.
No soil or water enters and no
water discharges at the joint of
inlet/outlet pipes.
NO. 9 – FENCING
Maintenance
Component
Defect or Problem Conditions When Maintenance is Needed Results Expected When
Maintenance is Performed
Site Erosion or holes
under fence
Erosion or holes more than 4 inches high and
12- 18 inches wide permitting access through
an opening under a fence.
No access under the fence.
Wood Posts,
Boards and Cross
Members
Missing or
damaged parts
Missing or broken boards, post out of plumb
by more than 6 inches or cross members
broken
No gaps on fence due to missing
or broken boards, post plumb to
within 1½ inches, cross
members sound.
Weakened by
rotting or insects
Any part showing structural deterioration due
to rotting or insect damage
All parts of fence are structurally
sound.
Damaged or failed
post foundation
Concrete or metal attachments deteriorated
or unable to support posts.
Post foundation capable of
supporting posts even in strong
wind.
Metal Posts, Rails
and Fabric
Damaged parts Post out of plumb more than 6 inches. Post plumb to within 1½ inches.
Top rails bent more than 6 inches. Top rail free of bends greater
than 1 inch.
Any part of fence (including post, top rails,
and fabric) more than 1 foot out of design
alignment.
Fence is aligned and meets
design standards.
Missing or loose tension wire. Tension wire in place and
holding fabric.
Deteriorated paint
or protective
coating
Part or parts that have a rusting or scaling
condition that has affected structural
adequacy.
Structurally adequate posts or
parts with a uniform protective
coating.
Openings in fabric Openings in fabric are such that an 8-inch
diameter ball could fit through.
Fabric mesh openings within 50%
of grid size.
NO. 11 – GROUNDS (LANDSCAPING)
Maintenance
Component
Defect or Problem Conditions When Maintenance is Needed Results Expected When
Maintenance is Performed
Site Trash or litter Any trash and debris which exceed 1 cubic
foot per 1,000 square feet (this is about
equal to the amount of trash it would take to
fill up one standard size office garbage can).
In general, there should be no visual
evidence of dumping.
Trash and debris cleared from site.
Noxious weeds Any noxious or nuisance vegetation which
may constitute a hazard to County
personnel or the public.
Noxious and nuisance vegetation
removed according to applicable
regulations. No danger of
noxious vegetation where County
personnel or the public might
normally be.
LONGACRES BUSINESS CENTER PHASE II 24
Contaminants and
pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or
paint.
Materials removed and disposed
of according to applicable
regulations. Source control BMPs
implemented if appropriate. No
contaminants present other than
a surface oil film.
Grass/groundcover Grass or groundcover exceeds 18 inches in
height.
Grass or groundcover mowed to
a height no greater than 6 inches.
Trees and Shrubs Hazard Any tree or limb of a tree identified as having
a potential to fall and cause property damage
or threaten human life. A hazard tree
identified by a qualified arborist must be
removed as soon as possible.
No hazard trees in facility.
Damaged Limbs or parts of trees or shrubs that are
split or broken which affect more than 25%
of the total foliage of the tree or shrub.
Trees and shrubs with less than
5% of total foliage with split or
broken limbs.
Trees or shrubs that have been blown down
or knocked over.
No blown down vegetation or
knocked over vegetation. Trees
or shrubs free of injury.
Trees or shrubs which are not adequately
supported or are leaning over, causing
exposure of the roots.
Tree or shrub in place and
adequately supported; dead or
diseased trees removed.
NO. 12 – ACCESS ROADS
Maintenance
Component
Defect or Problem Condition When Maintenance is Needed Results Expected When
Maintenance is Performed
Site Trash and debris Trash and debris exceeds 1 cubic foot per
1,000 square feet (i.e., trash and debris
would fill up one standards size garbage
can).
Roadway drivable by
maintenance vehicles.
Debris which could damage vehicle tires or
prohibit use of road.
Roadway drivable by
maintenance vehicles.
Contaminants and
pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or
paint.
Materials removed and disposed
of according to applicable
regulations. Source control BMPs
implemented if appropriate. No
contaminants present other than
a surface oil film.
Blocked roadway Any obstruction which reduces clearance
above road surface to less than 14 feet.
Roadway overhead clear to 14
feet high.
Any obstruction restricting the access to a
10- to 12 foot width for a distance of more
than 12 feet or any point restricting access
to less than a 10 foot width.
At least 12-foot of width on
access road.
Road Surface Erosion,
settlement,
potholes, soft
spots, ruts
Any surface defect which hinders or
prevents maintenance access.
Road drivable by maintenance
vehicles.
Vegetation on road
surface
Trees or other vegetation prevent access to
facility by maintenance vehicles.
Maintenance vehicles can access
facility.
Shoulders and
Ditches
Erosion Erosion within 1 foot of the roadway more
than 8 inches wide and 6 inches deep.
Shoulder free of erosion and
matching the surrounding road.
Weeds and brush Weeds and brush exceed 18 inches in height
or hinder maintenance access.
Weeds and brush cut to 2 inches
in height or cleared in such a way
as to allow maintenance access.
LONGACRES BUSINESS CENTER PHASE II 25
Modular Grid
Pavement
Contaminants and
pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or
paint.
Materials removed and disposed
of according to applicable
regulations. Source control BMPs
implemented if appropriate. No
contaminants present other than
a surface oil film.
Damaged or missing Access surface compacted because of
broken on missing modular block.
Access road surface restored so
road infiltrates.
NO. 16 – WETPONDS
Maintenance
Component
Defect or Problem Condition When Maintenance is Needed Results Expected When
Maintenance Is Performed
Site Trash and debris Any trash and debris accumulated on the
wetpond site.
Wetpond site free of any trash or
debris.
Noxious weeds Any noxious or nuisance vegetation which
may constitute a hazard to County
personnel or the public.
Noxious and nuisance vegetation
removed according to applicable
regulations. No danger of
noxious vegetation where County
personnel or the public might
normally be.
Contaminants and
pollution
Any evidence of contaminants or pollution
such as oil, gasoline, concrete slurries or
paint.
Materials removed and disposed
of according to applicable
regulations. Source control BMPs
implemented if appropriate. No
contaminants present other than
a surface oil film.
Grass/groundcover Grass or groundcover exceeds 18 inches in
height.
Grass or groundcover mowed to
a height no greater than 6 inches.
Side Slopes of
Dam, Berm,
internal berm or
Embankment
Rodent holes Any evidence of rodent holes if facility is
acting as a dam or berm, or any evidence of
water piping through dam or berm via rodent
holes.
Rodents removed or destroyed
and dam or berm repaired.
Tree growth Tree growth threatens integrity of dams,
berms or slopes, does not allow maintenance
access, or interferes with maintenance
activity. If trees are not a threat to dam, berm
or embankment integrity, are not interfering
with access or maintenance or leaves do not
cause a plugging problem they do not need to
be removed.
Trees do not hinder facility
performance or maintenance
activities.
Erosion Eroded damage over 2 inches deep where
cause of damage is still present or where
there is potential for continued erosion. Any
erosion observed on a compacted slope.
Slopes stabilized using
appropriate erosion control
measures. If erosion is occurring
on compacted slope, a licensed
civil engineer should be consulted
to resolve source of erosion.
Top or Side
Slopes of Dam,
Berm, internal
berm or
Embankment
Settlement Any part of a dam, berm or embankment that
has settled 4 inches lower than the design
elevation.
Top or side slope restored to
design dimensions. If settlement
is significant, a licensed civil
engineer should be consulted to
determine the cause of the
settlement.
Irregular surface on
internal berm
Top of berm not uniform and level. Top of berm graded to design
elevation.
LONGACRES BUSINESS CENTER PHASE II 26
Pond Areas Sediment
accumulation
(except first wetpool
cell)
Accumulated sediment that exceeds 10% of
the designed pond depth.
Sediment cleaned out to
designed pond shape and depth.
Sediment
accumulation (first
wetpool cell)
Sediment accumulations in pond bottom that
exceeds the depth of sediment storage (1
foot) plus 6 inches.
Sediment storage contains no
sediment.
Liner damaged (If
Applicable)
Liner is visible or pond does not hold water
as designed.
Liner repaired or replaced.
Water level (first
wetpool cell)
First cell empty, doesn't hold water. Water retained in first cell for most
of the year.
Algae mats (first
wetpool cell)
Algae mats develop over more than 10% of
the water surface should be removed.
Algae mats removed (usually in
the late summer before Fall rains,
especially in Sensitive Lake
Protection Areas.)
Gravity Drain Inoperable valve Valve will not open and close. Valve opens and closes normally.
Valve won’t seal Valve does not seal completely. Valve completely seals closed.
Emergency
Overflow Spillway
Tree growth Tree growth impedes flow or threatens
stability of spillway.
Trees removed.
Rock missing Only one layer of rock exists above native
soil in area five square feet or larger, or any
exposure of native soil at the top of out flow
path of spillway. Rip-rap on inside slopes
need not be replaced.
Spillway restored to design
standards.
Inlet/Outlet Pipe Sediment
accumulation
Sediment filling 20% or more of the pipe. Inlet/outlet pipes clear of sediment.
Trash and debris Trash and debris accumulated in inlet/outlet
pipes (includes floatables and non-
floatables).
No trash or debris in pipes.
Damaged Cracks wider than ½-inch at the joint of the
inlet/outlet pipes or any evidence of soil
entering at the joints of the inlet/outlet pipes.
No cracks more than ¼-inch wide
at the joint of the inlet/outlet pipe.
LONGACRES BUSINESS CENTER PHASE II 27
Figures
Figure 1 – TIR Worksheet
Figure 2 – Parcel Conditions
Figure 3 – Site Location
Figure 4 – Proposed Conditions
Figure 5 – Drainage Basin Map
Figure 6 – Flow Control Map
Figure 7 – King County iMAP - Floodplain
Figure 8 – City of Renton Soil Survey Map
Figure 9 – Drainage Complaints Map
BN Inc4th
Rainier
Lind3rd
Cedar River
140thPetrovitskyI-405TalbotParkG r a d y
I
-5SR 167108th148thInterurban68thBe
n
s
o
n84thLogan 9 5 t h
144thDuvall78th
16th WellsAndoverOakesdale27th
SR 515Coal
Cr
eek128th
72nd43rd MercerWest Valley8th
May Valley
C arr116th
79th
76thPuget6th 164thRenton Issaquah
134th KirklandFairwood
Renton Maple ValleyMonroe
Southcenter132nd
8
0
t
h
204th
41st East Valley34th 89thLangston
5th
200thUnionWilliamsBeacon 154thHoquiamMaple Valley57th9th
30th
Forest
JonesSeward ParkNewcastle
Aberdeen184thBangor
88th
169th
SR 900194th CornellHarringtonHardieValleyPelly56th
58th183rd121st
161st62nd168th149th64th
Parkside96th63rdGarden186th
Strander
87th19th
Mill
Sunset 176th59thPedestrian156th1 2 th
21st
70th
175thLincoln125th135th
Leo 61st31st
155th92nd
Dixon 118th24th81st
Renton133rd
2nd 166th15th Lakemont160th
1 0 th
1 4 t h
Avon Island CrestTukwilaMa
u
l
eNewcastle Golf Club
171stEdmonds39th
1 4 1 s t
Martin L King Jr
Taft
29th
Blaine1 9 2 n d
180th FieldTobin
Lakeridge
S i dn ey
114th
208th 177th1 9 6 th174th106th53rd38th93rd32nd
83rd
L
a
k
e
Y
o
u
n
g
s
T
r
ailShattuck 142nd
82nd
136thCrestwoodAccess112th
Licorice
143rd23rd
S
o
o
s
C
re
e
k
W
oodsideBronsonHolly
131stNorfolk
138th
104th52ndIndex
159th55thPer
i
met
er
105th1 9 9 t h
178th
6 5 t h
66th
71st
Airport
BurnettRoyal Hills123rd126thOlympiaM
onster
75th Hous
erWoodley
190thIsland 7th
28th
167th35th
Rosario8
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C o al C re e k
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Springbrook CreekCoal Creek Tributary
UnnamedU n n a m e d Coal CreekUnnamedUnnamedUnnamed
UnnamedUnnamedUn
n
a
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dUnnamedKing County
Kent
Tukwila
Newcastle
Seattle
Bellevue
King County
Mercer Island
King County
King County
SeaTac
King County
King County
King County
King County
Kent
Renton City Limits
Potential Annexation Area
Basins
Black River
Duamish
Lake Washington East
Lake Washington West
Lower Cedar River
May Creek
Soos Creek
´
Surface Water UtilityComprehensive PlanPrinted 10/16/2009
Basin Locations 0 10.5
Miles
iMAP
The information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King
County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information.
This document is not intended for use as a survey product. King County shall not be liable for any general, special, indirect, incidental, or consequential
damages including, but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. Any sale of
this map or information on this map is prohibited except by written permission of King County.
Date: 10/10/2013 Source: King County iMAP - Hydrographic Information (http://www.metrokc.gov/GIS/iMAP)
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Madsen CreekGypsy Creek
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kPanther CreekMay
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kMay CreekCoal
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Panther Creek
Groundwater Protection Area Boundary
Aquifer Protection Area Zone 1
Aquifer Protection Area Zone 1 Modified
Renton City Limits
City of Renton Soil Survey Map
Public Works
Surface Water Utility
G. Del Rosario
12/22/2009 ´0 0.5 1
Miles
Reference 11-C
LONGACRES BUSINESS CENTER PHASE II 28
Appendix A
Engineering Calculations
PRE-DEVELOPED BASIN SUMMARY
Friday, August 14, 2015
PRE-DEVELOPED EVENT SUMMARY
Event Peak Q (cfs) Peak T (hrs) Hyd Vol (acft) Area (ac) Method
1/3 2 yr 0.0736 22.00 0.0797 16.27 SBUH
2 yr 24 hr 1.406 8.6667 1.1292 16.27 SBUH
5 year 2.0748 8.50 1.5555 16.27 SBUH
10 year 2.9927 8.50 2.1201 16.27 SBUH
25 year 3.9612 8.50 2.7092 16.27 SBUH
50 year 4.1593 8.50 2.8293 16.27 SBUH
100 year 5.1051 8.50 3.4018 16.27 SBUH
All results based on storm duration of 24.0 hours. This is ok if all precipitations are appropriate for the storm
duration. If some design event precipitations are for different duration storms, those results are incorrect
RECORD ID: PRE-DEVELOPED
Design Method SBUH Rainfall type TYPE1A.RAC
Hyd Intv 10.00 min Peaking Factor 484.00
Storm Duration 24.00 hrs Abstraction Coeff 0.20
Pervious Area 16.27 ac DCIA 0.00 ac
Pervious CN 86.39 DC CN 0.00
Pervious TC 62.3165 min DC TC 0.00 min
Pervious CN Calc
Description SubArea Sub cn
Open spaces, lawns, parks (50-75% grass) 14.13 ac 86.00
Gravel Roads & Parking Lots 2.14 ac 89.00
Pervious Composited CN (AMC 2) 86.3946
Pervious TC Calc
Type Description Length Slope Coeff Misc TT
Sheet Woods or forest with light underbrush. 120.00 ft 1.0% 0.4 1.95 in 41.9977 min
Shallow Short grass, pasture and lawns (n=0.030) 270.00 ft 0.4% 0.03 4.4099 min
Shallow Paved and gravel areas (n=0.012) 635.00 ft 0.17% 0.012 15.909 min
Pervious TC 62.3165 min
PROJECT RECORD 2
DEVELOPED EVENT SUMMARY
Event Peak Q (cfs) Peak T (hrs) Hyd Vol (acft) Area (ac) Method
1/3 2 yr 1.2576 8.00 0.4521 15.96 SBUH
2 yr 24 hr 5.4632 8.00 1.9601 15.96 SBUH
5 year 6.8445 8.00 2.459 15.96 SBUH
10 year 8.5904 8.00 3.0922 15.96 SBUH
25 year 10.3494 8.00 3.7328 15.96 SBUH
50 year 10.7022 8.00 3.8616 15.96 SBUH
100 year 12.3639 8.00 4.4689 15.96 SBUH
All results based on storm duration of 24.0 hours. This is ok if all precipitations are appropriate for the storm
duration. If some design event precipitations are for different duration storms, those results are incorrect
RECORD ID: DEVELOPED
Design Method SBUH Rainfall type TYPE1A.RAC
Hyd Intv 10.00 min Peaking Factor 484.00
Storm Duration 24.00 hrs Abstraction Coeff 0.20
Pervious Area 4.89 ac DCIA 11.07 ac
Pervious CN 87.67 DC CN 98.00
Pervious TC 20.3216 min DC TC 5.6928 min
Pervious CN Calc
Description SubArea Sub cn
Open spaces, lawns, parks (50-75% grass) 2.04 ac 90.00
Open spaces, lawns,parks (>75% grass) 2.85 ac 86.00
Pervious Composited CN (AMC 2) 87.6687
Pervious TC Calc
Type Description Length Slope Coeff Misc TT
Sheet Short prairie grass and lawns. 105.00 ft 1.0% 0.15 0.00 in 17.2209 min
Int Channel Concrete pipe (n=0.012) 95.00 ft 1.0% 0.012 0.3729 min
Int Channel Concrete pipe (n=0.012) 320.00 ft 1.0% 0.012 1.256 min
Int Channel Concrete pipe (n=0.012) 300.00 ft 1.0% 0.012 1.1775 min
Int Channel Concrete pipe (n=0.012) 75.00 ft 1.0% 0.012 0.2944 min
Pervious TC 20.3216 min
PROJECT RECORD 3
DCI - CN Calc
Description SubArea Sub cn
Impervious surfaces (pavements, roofs, etc) 8.96 ac 98.00
Commercial & Business 2.11 ac 98.00
DC Composited CN (AMC 2) 98.00
DCI - TC Calc
Type Description Length Slope Coeff Misc TT
Int Channel Concrete pipe (n=0.012) 312.00 ft 1.0% 0.012 1.2246 min
Int Channel Concrete pipe (n=0.012) 625.00 ft 1.0% 0.012 2.453 min
Sheet Smooth Surfaces. 98.00 ft 1.0% 0.011 1.95 in 2.0152 min
Pervious TC 5.6928 min
DETENTION POND CALCULATIONS
Friday, August 14, 2015
LPOOLCOMPUTE [Detention Pond] SUMMARY using Puls, 24 hr Storm Event
Start of live storage:10 ft
Event Match Q (cfs) Peak Q (cfs) Max Depth (ft) Vol (cf) Vol (acft) Time to Empty (hr)
2 yr 24 hr 1.406 1.405 1.1656 20778.8264 0.477 0.00
10 year 2.9927 2.9937 1.7359 31751.9484 0.7289 0.00
100 year 5.1051 5.1043 2.3619 44428.1197 1.0199 0.00
PROJECT RECORD 4
SUMMARY REPORT OF ALL DETENTION POND DATA
Event Precip (in)
1/3 2 yr 0.65
2 yr 24 hr 1.95
5 year 2.35
10 year 2.85
25 year 3.35
50 year 3.45
100 year 3.92
BASLIST2
[Developed] Using [TYPE1A.RAC] As [2 yr 24 hr] [24.0]
[Developed] Using [TYPE1A.RAC] As [10 year] [24.0]
[Developed] Using [TYPE1A.RAC] As [100 year] [24.0]
[Pre-developed] Using [TYPE1A.RAC] As [2 yr 24 hr] [24.0]
[Developed] Using [TYPE1A.RAC] As [2 yr 24 hr] [24.0]
[Pre-developed] Using [TYPE1A.RAC] As [10 year] [24.0]
[Developed] Using [TYPE1A.RAC] As [10 year] [24.0]
[Pre-developed] Using [TYPE1A.RAC] As [100 year] [24.0]
[Developed] Using [TYPE1A.RAC] As [100 year] [24.0]
LSTEND
PROJECT RECORD 5
BasinID Event Peak Q
(cfs)
Peak T
(hrs)
Peak Vol (ac-
cf)
Area
(ac) Method/Loss Raintype
Developed 2 yr 24
hr 5.4632 8.00 1.9601 15.96 SBUH TYPE1A.RAC
Developed 10 year 8.5904 8.00 3.0922 15.96 SBUH TYPE1A.RAC
Developed 100 year 12.3639 8.00 4.4689 15.96 SBUH TYPE1A.RAC
Pre-
developed
2 yr 24
hr 1.406 8.67 1.1292 16.27 SBUH TYPE1A.RAC
Developed 2 yr 24
hr 5.4632 8.00 1.9601 15.96 SBUH TYPE1A.RAC
Pre-
developed 10 year 2.9927 8.50 2.1201 16.27 SBUH TYPE1A.RAC
Developed 10 year 8.5904 8.00 3.0922 15.96 SBUH TYPE1A.RAC
Pre-
developed 100 year 5.1051 8.50 3.4018 16.27 SBUH TYPE1A.RAC
Developed 100 year 12.3639 8.00 4.4689 15.96 SBUH TYPE1A.RAC
BASLIST
[Developed] [Pre-developed]
LSTEND
RECORD ID: DEVELOPED
Design Method SBUH Rainfall type TYPE1A.RAC
Hyd Intv 10.00 min Peaking Factor 484.00
Storm Duration 24.00 hrs Abstraction Coeff 0.20
Pervious Area 4.89 ac DCIA 11.07 ac
Pervious CN 87.67 DC CN 98.00
Pervious TC 20.3216 min DC TC 5.6928 min
Pervious CN Calc
Description SubArea Sub cn
Open spaces, lawns, parks (50-75% grass) 2.04 ac 90.00
Open spaces, lawns,parks (>75% grass) 2.85 ac 86.00
Pervious Composited CN (AMC 2) 87.6687
Pervious TC Calc
Type Description Length Slope Coeff Misc TT
Sheet Short prairie grass and lawns. 105.00 ft 1.0% 0.15 0.00 in 17.2209 min
Int Channel Concrete pipe (n=0.012) 95.00 ft 1.0% 0.012 0.3729 min
PROJECT RECORD 6
Int Channel Concrete pipe (n=0.012) 320.00 ft 1.0% 0.012 1.256 min
Int Channel Concrete pipe (n=0.012) 300.00 ft 1.0% 0.012 1.1775 min
Int Channel Concrete pipe (n=0.012) 75.00 ft 1.0% 0.012 0.2944 min
Pervious TC 20.3216 min
DCI - CN Calc
Description SubArea Sub cn
Impervious surfaces (pavements, roofs, etc) 8.96 ac 98.00
Commercial & Business 2.11 ac 98.00
DC Composited CN (AMC 2) 98.00
DCI - TC Calc
Type Description Length Slope Coeff Misc TT
Int Channel Concrete pipe (n=0.012) 312.00 ft 1.0% 0.012 1.2246 min
Int Channel Concrete pipe (n=0.012) 625.00 ft 1.0% 0.012 2.453 min
Sheet Smooth Surfaces. 98.00 ft 1.0% 0.011 1.95 in 2.0152 min
Pervious TC 5.6928 min
RECORD ID: PRE-DEVELOPED
Design Method SBUH Rainfall type TYPE1A.RAC
Hyd Intv 10.00 min Peaking Factor 484.00
Storm Duration 24.00 hrs Abstraction Coeff 0.20
Pervious Area 16.27 ac DCIA 0.00 ac
Pervious CN 86.39 DC CN 0.00
Pervious TC 62.3165 min DC TC 0.00 min
Pervious CN Calc
Description SubArea Sub cn
Open spaces, lawns, parks (50-75% grass) 14.13 ac 86.00
Gravel Roads & Parking Lots 2.14 ac 89.00
Pervious Composited CN (AMC 2) 86.3946
Pervious TC Calc
Type Description Length Slope Coeff Misc TT
Sheet Woods or forest with light underbrush. 120.00 ft 1.0% 0.4 1.95 in 41.9977 min
PROJECT RECORD 7
Shallow Short grass, pasture and lawns (n=0.030) 270.00 ft 0.4% 0.03 4.4099 min
Shallow Paved and gravel areas (n=0.012) 635.00 ft 0.17% 0.012 15.909 min
Pervious TC 62.3165 min
HYDLIST SUMMARY
[2 yr 24 hr out] [10 year out] [100 year out] LSTEND
HydID Peak Q (cfs) Peak T (hrs) Peak Vol (ac-ft) Cont Area (ac)
2 yr 24 hr out 1.405 10.17 1.957 15.96
10 year out 2.9937 9.17 3.089 15.96
100 year out 5.1043 8.83 4.4655 15.96
STORLIST
[Pond]
LSTEND
RECORD ID: POND
Descrip: Prototype Record Increment 0.10 ft
Start El. 10.00 ft Max El. 20.00 ft
Void Ratio 100.00
Length 130.00 ft Width 130.00 ft
Length ss1 3.00v:1h Length ss2 3.00v:1h
Width ss1 3.00v:1h Width ss2 3.00v:1h
Consider wetted surface for infiltration
Trap Type Node
DISCHLIST
[Orifice]
LSTEND
RECORD ID: ORIFICE
Multiple Orifice
Descrip: Prototype Structure Increment 0.10 ft
Start El. 10.00 ft Max El. 20.00 ft
Orif Coeff 0.62 Lowest Orif El. 13.50 ft
Lowest Diam 6.9258 in Dist to next 1.20 ft
D2 8.0273 in Dist to next 0.60 ft
D3 7.7461 in Dist to next 0.60 ft
PROJECT RECORD 8
Stage Discharge and Routing Table
Appended on: Friday, August 14, 2015 10:26:04 AM
LPOOLCOMPUTE [Detention Pond] DETAILED using Puls, 24 hr Storm Event
Start of live storage:10 ft
Event Match Q (cfs) Peak Q (cfs) Max Depth (ft) Vol (cf) Vol (acft) Time to Empty (hr)
2 yr 24 hr 1.406 1.405 1.1656 20778.8275 0.477 2.8333
10 year 2.9927 2.9937 1.7359 31751.949 0.7289 4.8333
100 year 5.1051 5.1043 2.3619 44428.1201 1.0199 6.00
STORAGE CHARACTERISTICS TABLE FOR 2 YR 24 HR NODE
Stage (ft) Increm Vol (acft) Storage (acft) Flow (cf) S-Odt/2 S+Odt/2
0.00 0.00 0.00 0.00 0.00 0.00
0.10 0.039 0.038976 0.411623 0.036142 0.041811
0.20 0.0393 0.078313 0.582123 0.074303 0.082322
0.30 0.0397 0.11801 0.712952 0.1131 0.12292
0.40 0.0401 0.158071 0.823246 0.152401 0.163741
0.50 0.0404 0.198496 0.920417 0.192157 0.204835
0.60 0.0408 0.239288 1.008266 0.232344 0.246232
0.70 0.0412 0.280448 1.089052 0.272948 0.287948
0.80 0.0415 0.321978 1.164245 0.313959 0.329996
0.90 0.0419 0.363879 1.234869 0.355374 0.372383
1.00 0.0423 0.406152 1.301666 0.397188 0.415117
1.10 0.0426 0.448801 1.365199 0.439399 0.458203
1.20 0.043 0.491826 1.425904 0.482006 0.501646
1.30 0.0434 0.535229 2.037103 0.521199 0.549258
1.40 0.0438 0.579011 2.322177 0.563018 0.595004
1.50 0.0442 0.623175 2.55199 0.605599 0.640751
1.60 0.0445 0.667722 2.752442 0.648765 0.686678
1.70 0.0449 0.712653 2.933655 0.692449 0.732857
1.80 0.0453 0.75797 3.100875 0.736614 0.779326
1.90 0.0457 0.803676 3.772163 0.777696 0.829655
2.00 0.0461 0.84977 4.13307 0.821306 0.878235
2.10 0.0465 0.896256 4.437062 0.865698 0.926815
2.20 0.0469 0.943135 4.709155 0.910703 0.975568
2.30 0.0473 0.990409 4.959449 0.956253 1.024565
PROJECT RECORD 9
2.40 0.0477 1.038078 5.193351 1.002311 1.073845
2.50 0.0481 1.086146 5.414207 1.048858 1.123433
2.60 0.0485 1.134612 5.62429 1.095878 1.173347
2.70 0.0489 1.18348 5.825236 1.143361 1.223599
2.80 0.0493 1.232751 6.018279 1.191303 1.274199
2.90 0.0497 1.282426 6.204381 1.239696 1.325156
3.00 0.0501 1.332507 6.384312 1.288538 1.376476
3.10 0.0505 1.382996 6.558701 1.337826 1.428166
3.20 0.0509 1.433894 6.728072 1.387557 1.48023
3.30 0.0513 1.485203 6.892865 1.437732 1.532675
3.40 0.0517 1.536925 7.05346 1.488347 1.585502
3.50 0.0521 1.589061 7.21018 1.539404 1.638718
3.60 0.0526 1.641613 7.363311 1.590902 1.692325
3.70 0.053 1.694583 7.513102 1.64284 1.746326
3.80 0.0534 1.747972 7.659773 1.695219 1.800725
3.90 0.0538 1.801782 7.803522 1.748039 1.855525
4.00 0.0542 1.856015 7.944523 1.8013 1.910729
4.10 0.0547 1.910672 8.082936 1.855004 1.966339
4.20 0.0551 1.965754 8.218903 1.90915 2.022358
4.30 0.0555 2.021265 8.352556 1.96374 2.078789
4.40 0.0559 2.077204 8.484012 2.018774 2.135634
4.50 0.0564 2.133574 8.613379 2.074254 2.192895
4.60 0.0568 2.190377 8.740759 2.130179 2.250575
4.70 0.0572 2.247614 8.866242 2.186552 2.308677
4.80 0.0577 2.305287 8.989913 2.243373 2.367201
4.90 0.0581 2.363397 9.11185 2.300644 2.426151
5.00 0.0585 2.421947 9.232128 2.358365 2.485529
5.10 0.059 2.480937 9.350812 2.416537 2.545336
5.20 0.0594 2.54037 9.467967 2.475163 2.605576
5.30 0.0599 2.600246 9.583652 2.534243 2.666249
5.40 0.0603 2.660569 9.697921 2.593779 2.727359
5.50 0.0608 2.721338 9.810827 2.653771 2.788906
5.60 0.0612 2.782557 9.922418 2.714221 2.850893
5.70 0.0617 2.844227 10.03274 2.775131 2.913323
PROJECT RECORD 10
5.80 0.0621 2.906349 10.141836 2.836501 2.976196
5.90 0.0626 2.968924 10.249747 2.898334 3.039515
6.00 0.063 3.031956 10.356512 2.96063 3.103282
6.10 0.0635 3.095445 10.462166 3.023391 3.167498
6.20 0.0639 3.159392 10.566745 3.086619 3.232166
6.30 0.0644 3.223801 10.67028 3.150314 3.297288
6.40 0.0649 3.288671 10.772804 3.214479 3.362864
6.50 0.0653 3.354006 10.874345 3.279114 3.428898
6.60 0.0658 3.419806 10.974932 3.344221 3.495391
6.70 0.0663 3.486073 11.074592 3.409802 3.562345
6.80 0.0667 3.55281 11.17335 3.475858 3.629761
6.90 0.0672 3.620016 11.27123 3.542391 3.697642
7.00 0.0677 3.687695 11.368255 3.609401 3.765989
7.10 0.0682 3.755848 11.464449 3.676892 3.834804
7.20 0.0686 3.824476 11.559832 3.744863 3.904089
7.30 0.0691 3.893581 11.654424 3.813317 3.973846
7.40 0.0696 3.963165 11.748246 3.882255 4.044076
7.50 0.0701 4.03323 11.841316 3.951678 4.114782
7.60 0.0705 4.103777 11.933651 4.021589 4.185964
7.70 0.071 4.174807 12.02527 4.091988 4.257626
7.80 0.0715 4.246323 12.116189 4.162878 4.329768
7.90 0.072 4.318326 12.206423 4.234259 4.402392
8.00 0.0725 4.390817 12.295989 4.306134 4.4755
8.10 0.073 4.463799 12.3849 4.378504 4.549095
8.20 0.0735 4.537273 12.473172 4.45137 4.623176
8.30 0.074 4.611241 12.560817 4.524734 4.697748
8.40 0.0745 4.685704 12.64785 4.598597 4.77281
8.50 0.075 4.760663 12.734282 4.672962 4.848365
8.60 0.0755 4.836122 12.820127 4.747829 4.924415
8.70 0.076 4.912081 12.905396 4.823201 5.000961
8.80 0.0765 4.988541 12.990101 4.899078 5.078005
8.90 0.077 5.065506 13.074252 4.975463 5.155549
9.00 0.0775 5.142975 13.157862 5.052356 5.233594
9.10 0.078 5.220952 13.240939 5.129761 5.312143
PROJECT RECORD 11
9.20 0.0785 5.299437 13.323495 5.207677 5.391196
9.30 0.079 5.378432 13.405538 5.286107 5.470756
9.40 0.0795 5.457939 13.487079 5.365052 5.550825
9.50 0.08 5.537959 13.568126 5.444515 5.631404
9.60 0.0805 5.618495 13.648689 5.524496 5.712494
9.70 0.0811 5.699547 13.728776 5.604996 5.794098
9.80 0.0816 5.781118 13.808396 5.686019 5.876217
9.90 0.0821 5.863209 13.887556 5.767565 5.958853
10.00 0.0826 5.945822 13.966265 5.849635 6.042008
ROUTING TABLE FOR 2 YR 24 HR EVENT
Time (min) Inflow (cfs) AvgI (cf) Stg (ft), S-0dt/2 (acft) S+0dt/2 (acft) Stg (ft) Outflow (cfs)
0.00 0.0007 0.00 0.00 0.00 0.00 0.00 0.00
10.00 0.0182 5.6695 0.00 0.00 0.0001 0.0003 0.0013
20.00 0.0579 22.8565 0.0003 0.0001 0.0006 0.0015 0.0063
30.00 0.1014 47.7974 0.0015 0.0006 0.0016 0.0039 0.0162
40.00 0.1463 74.3127 0.0039 0.0014 0.0031 0.0075 0.0308
50.00 0.1895 100.7497 0.0075 0.0027 0.005 0.012 0.0494
60.00 0.2249 124.3201 0.012 0.0043 0.0072 0.0172 0.0708
70.00 0.2652 147.0295 0.0172 0.0062 0.0096 0.0229 0.0944
80.00 0.3043 170.8595 0.0229 0.0083 0.0122 0.0292 0.1202
90.00 0.3331 191.2423 0.0292 0.0106 0.0149 0.0358 0.1472
100.00 0.3585 207.5005 0.0358 0.0129 0.0177 0.0423 0.1741
110.00 0.3813 221.9563 0.0423 0.0153 0.0204 0.0487 0.2007
120.00 0.4019 234.9635 0.0487 0.0176 0.023 0.055 0.2265
130.00 0.4205 246.716 0.055 0.0199 0.0256 0.0611 0.2516
140.00 0.4374 257.3707 0.0611 0.0221 0.028 0.067 0.2756
150.00 0.4528 267.0602 0.067 0.0242 0.0303 0.0725 0.2986
160.00 0.4809 280.1166 0.0725 0.0262 0.0327 0.0781 0.3214
170.00 0.5095 297.1217 0.0781 0.0282 0.035 0.0838 0.345
180.00 0.5236 309.9383 0.0838 0.0303 0.0374 0.0895 0.3683
190.00 0.566 326.8994 0.0895 0.0323 0.0398 0.0953 0.3922
200.00 0.6105 352.9481 0.0953 0.0344 0.0425 0.1018 0.4147
210.00 0.6251 370.6725 0.1018 0.0368 0.0453 0.1087 0.4265
PROJECT RECORD 12
220.00 0.6687 388.1459 0.1087 0.0395 0.0484 0.1162 0.4392
230.00 0.7147 415.0168 0.1162 0.0423 0.0519 0.1248 0.4539
240.00 0.7305 433.5614 0.1248 0.0456 0.0556 0.1339 0.4695
250.00 0.7793 452.9553 0.1339 0.0491 0.0595 0.1436 0.486
260.00 0.8319 483.351 0.1436 0.0528 0.0639 0.1545 0.5045
270.00 0.852 505.151 0.1545 0.0569 0.0685 0.166 0.5241
280.00 0.905 527.0896 0.166 0.0613 0.0734 0.178 0.5446
290.00 0.9609 559.7654 0.178 0.0659 0.0788 0.1912 0.5671
300.00 0.9822 582.9189 0.1912 0.071 0.0843 0.205 0.5886
310.00 1.0741 616.87 0.205 0.0762 0.0904 0.2199 0.6081
320.00 1.1728 674.058 0.2199 0.082 0.0975 0.2373 0.631
330.00 1.20 711.834 0.2373 0.0888 0.1051 0.2562 0.6556
340.00 1.3359 760.771 0.2562 0.0961 0.1136 0.277 0.6828
350.00 1.4829 845.629 0.277 0.1042 0.1236 0.3016 0.7147
360.00 1.5189 900.5343 0.3016 0.1137 0.1344 0.3281 0.744
370.00 1.6839 960.8397 0.3281 0.1242 0.1462 0.3571 0.7759
380.00 1.8621 1063.7818 0.3571 0.1355 0.1599 0.3907 0.813
390.00 1.9065 1130.5655 0.3907 0.1488 0.1747 0.4267 0.8492
400.00 3.4364 1602.8577 0.4267 0.163 0.1998 0.4878 0.9085
410.00 5.1556 2577.5849 0.4878 0.1873 0.2465 0.6006 1.0087
420.00 5.4632 3185.6397 0.6006 0.2326 0.3057 0.7422 1.1208
430.00 4.3526 2944.7413 0.7422 0.2903 0.3579 0.8658 1.2107
440.00 3.0401 2217.7938 0.8658 0.3412 0.3921 0.9461 1.2657
450.00 2.9237 1789.1346 0.9461 0.3747 0.4157 1.0015 1.3026
460.00 2.5788 1650.7662 1.0015 0.3978 0.4357 1.0478 1.332
470.00 2.2117 1437.1713 1.0478 0.4174 0.4503 1.0818 1.3536
480.00 2.1633 1312.4972 1.0818 0.4317 0.4618 1.1083 1.3703
490.00 1.9294 1227.8071 1.1083 0.443 0.4711 1.1298 1.3833
500.00 1.6787 1082.4443 1.1298 0.4521 0.4769 1.1431 1.3914
510.00 1.6427 996.4109 1.1431 0.4578 0.4806 1.1517 1.3966
520.00 1.564 962.0052 1.1517 0.4614 0.4835 1.1582 1.4005
530.00 1.4846 914.587 1.1582 0.4642 0.4852 1.1621 1.4029
540.00 1.4723 887.0704 1.1621 0.4659 0.4862 1.1645 1.4044
550.00 1.4021 862.3157 1.1645 0.4669 0.4867 1.1656 1.405
PROJECT RECORD 13
560.00 1.3267 818.6203 1.1656 0.4673 0.4861 1.1643 1.4042
570.00 1.3164 792.9285 1.1643 0.4668 0.485 1.1617 1.4026
580.00 1.2691 775.6497 1.1617 0.4657 0.4835 1.1582 1.4005
590.00 1.2185 746.2632 1.1582 0.4642 0.4813 1.1532 1.3975
600.00 1.2117 729.0481 1.1532 0.4621 0.4788 1.1474 1.394
610.00 1.1876 719.7814 1.1474 0.4596 0.4761 1.1413 1.3903
620.00 1.1624 704.9866 1.1413 0.457 0.4732 1.1344 1.3861
630.00 1.1593 696.5126 1.1344 0.4541 0.4701 1.1273 1.3818
640.00 1.1366 688.7897 1.1273 0.451 0.4668 1.1199 1.3773
650.00 1.112 674.5806 1.1199 0.4479 0.4634 1.1119 1.3724
660.00 1.1092 666.3635 1.1119 0.4445 0.4598 1.1036 1.3674
670.00 1.0865 658.714 1.1036 0.4409 0.456 1.095 1.362
680.00 1.0617 644.4517 1.095 0.4373 0.4521 1.0858 1.3562
690.00 1.0587 636.1309 1.0858 0.4334 0.448 1.0763 1.3502
700.00 1.0357 628.3481 1.0763 0.4294 0.4438 1.0666 1.344
710.00 1.0107 613.9194 1.0666 0.4253 0.4394 1.0564 1.3375
720.00 1.0075 605.4355 1.0564 0.421 0.4349 1.0459 1.3308
730.00 1.0068 604.2717 1.0459 0.4166 0.4304 1.0355 1.3242
740.00 1.0069 604.0994 1.0355 0.4122 0.4261 1.0254 1.3178
750.00 1.0074 604.3002 1.0254 0.4079 0.4218 1.0155 1.3115
760.00 0.9856 597.9139 1.0155 0.4037 0.4174 1.0054 1.3051
770.00 0.961 583.9777 1.0054 0.3995 0.4129 0.9947 1.2981
780.00 0.958 575.7007 0.9947 0.395 0.4082 0.9838 1.2909
790.00 0.9574 574.6122 0.9838 0.3904 0.4036 0.9731 1.2837
800.00 0.9574 574.4319 0.9731 0.3859 0.3991 0.9626 1.2767
810.00 0.9578 574.5749 0.9626 0.3815 0.3947 0.9523 1.2698
820.00 0.9358 568.0765 0.9523 0.3772 0.3903 0.9419 1.2628
830.00 0.9108 553.9765 0.9419 0.3729 0.3856 0.9309 1.2555
840.00 0.9076 545.5379 0.9309 0.3683 0.3808 0.9198 1.2481
850.00 0.9068 544.3119 0.9198 0.3636 0.3761 0.9088 1.2407
860.00 0.9066 544.0048 0.9088 0.359 0.3715 0.898 1.2334
870.00 0.9068 544.0281 0.898 0.3545 0.367 0.8874 1.226
880.00 0.8845 537.3931 0.8874 0.3501 0.3625 0.8766 1.2184
890.00 0.8593 523.1298 0.8766 0.3457 0.3577 0.8654 1.2104
PROJECT RECORD 14
900.00 0.8558 514.5402 0.8654 0.341 0.3528 0.8539 1.2023
910.00 0.8548 513.1906 0.8539 0.3363 0.3481 0.8426 1.1944
920.00 0.8545 512.773 0.8426 0.3316 0.3434 0.8316 1.1866
930.00 0.8545 512.694 0.8316 0.327 0.3388 0.8208 1.1789
940.00 0.8548 512.8037 0.8208 0.3226 0.3343 0.8103 1.1715
950.00 0.8553 513.0247 0.8103 0.3182 0.33 0.80 1.1642
960.00 0.8558 513.3113 0.80 0.314 0.3257 0.7899 1.1566
970.00 0.8334 506.7664 0.7899 0.3098 0.3214 0.7797 1.1489
980.00 0.8081 492.4677 0.7797 0.3056 0.3169 0.7689 1.1409
990.00 0.8046 483.8022 0.7689 0.3012 0.3123 0.7579 1.1326
1000.00 0.8034 482.3775 0.7579 0.2967 0.3078 0.7472 1.1245
1010.00 0.8029 481.8806 0.7472 0.2923 0.3034 0.7366 1.1166
1020.00 0.8028 481.7201 0.7366 0.288 0.299 0.7264 1.1089
1030.00 0.78 474.8622 0.7264 0.2838 0.2947 0.716 1.1011
1040.00 0.7544 460.3184 0.716 0.2795 0.2901 0.705 1.0928
1050.00 0.7505 451.4691 0.705 0.275 0.2854 0.6938 1.0841
1060.00 0.7492 449.912 0.6938 0.2704 0.2808 0.6828 1.0752
1070.00 0.7485 449.3114 0.6828 0.266 0.2763 0.672 1.0665
1080.00 0.7483 449.0649 0.672 0.2616 0.2719 0.6615 1.058
1090.00 0.7254 442.1181 0.6615 0.2573 0.2675 0.6509 1.0494
1100.00 0.6995 427.4728 0.6509 0.253 0.2628 0.6398 1.0404
1110.00 0.6956 418.532 0.6398 0.2485 0.2581 0.6285 1.0313
1120.00 0.6941 416.9021 0.6285 0.2439 0.2535 0.6174 1.0223
1130.00 0.6934 416.2379 0.6174 0.2394 0.249 0.6065 1.0135
1140.00 0.6931 415.9333 0.6065 0.235 0.2445 0.5959 1.0047
1150.00 0.693 415.8312 0.5959 0.2307 0.2402 0.5855 0.9956
1160.00 0.6931 415.8498 0.5855 0.2265 0.2361 0.5755 0.9867
1170.00 0.6933 415.9408 0.5755 0.2225 0.232 0.5657 0.9781
1180.00 0.6936 416.075 0.5657 0.2186 0.2281 0.5562 0.9698
1190.00 0.6939 416.2345 0.5562 0.2148 0.2243 0.5471 0.9618
1200.00 0.6942 416.4087 0.5471 0.2111 0.2206 0.5381 0.9539
1210.00 0.6945 416.5912 0.5381 0.2075 0.2171 0.5295 0.9463
1220.00 0.6948 416.778 0.5295 0.204 0.2136 0.5211 0.939
1230.00 0.6951 416.9668 0.5211 0.2006 0.2102 0.513 0.9318
PROJECT RECORD 15
1240.00 0.6954 417.1562 0.513 0.1974 0.207 0.5051 0.9249
1250.00 0.6957 417.3453 0.5051 0.1942 0.2038 0.4975 0.918
1260.00 0.696 417.5335 0.4975 0.1912 0.2007 0.49 0.9107
1270.00 0.6732 410.7871 0.49 0.1882 0.1976 0.4825 0.9034
1280.00 0.6473 396.1733 0.4825 0.1852 0.1943 0.4743 0.8955
1290.00 0.6433 387.2037 0.4743 0.1819 0.1908 0.4659 0.8873
1300.00 0.6418 385.5391 0.4659 0.1786 0.1875 0.4577 0.8793
1310.00 0.641 384.8315 0.4577 0.1754 0.1842 0.4498 0.8716
1320.00 0.6406 384.4781 0.4498 0.1722 0.181 0.442 0.8641
1330.00 0.6405 384.3241 0.442 0.1691 0.1779 0.4345 0.8568
1340.00 0.6405 384.2893 0.4345 0.1661 0.175 0.4273 0.8498
1350.00 0.6406 384.3262 0.4273 0.1632 0.1721 0.4203 0.8429
1360.00 0.6408 384.406 0.4203 0.1605 0.1693 0.4135 0.8364
1370.00 0.6409 384.5114 0.4135 0.1578 0.1666 0.4069 0.83
1380.00 0.6412 384.6318 0.4069 0.1552 0.164 0.4006 0.8238
1390.00 0.3865 308.295 0.4006 0.1526 0.1597 0.3901 0.8124
1400.00 0.0974 145.1693 0.3901 0.1485 0.1519 0.3709 0.7911
1410.00 0.0501 44.2507 0.3709 0.141 0.142 0.3467 0.7644
1420.00 0.0297 23.9303 0.3467 0.1314 0.132 0.3222 0.7375
1430.00 0.018 14.2873 0.3222 0.1218 0.1222 0.2981 0.7105
1440.00 0.0109 8.6449 0.2981 0.1124 0.1126 0.2745 0.6796
1450.00 0.0066 5.2309 0.2745 0.1032 0.1033 0.2518 0.6499
1460.00 0.004 3.1651 0.2518 0.0944 0.0945 0.2299 0.6212
1470.00 0.0024 1.9151 0.2299 0.0859 0.0859 0.2089 0.5938
1480.00 0.0015 1.1588 0.2089 0.0778 0.0778 0.1888 0.5631
1490.00 0.0009 0.7012 0.1888 0.07 0.0701 0.1697 0.5305
1500.00 0.0005 0.4243 0.1697 0.0627 0.0628 0.1517 0.4998
1510.00 0.0003 0.2567 0.1517 0.0559 0.0559 0.1347 0.4708
1520.00 0.0002 0.1553 0.1347 0.0494 0.0494 0.1187 0.4436
1530.00 0.0001 0.094 0.1187 0.0433 0.0433 0.1037 0.4178
1540.00 0.00 0.0354 0.1037 0.0375 0.0375 0.0898 0.3695
1550.00 0.00 0.00 0.0898 0.0324 0.0324 0.0776 0.3194
1560.00 0.00 0.00 0.0776 0.028 0.028 0.0671 0.2761
1570.00 0.00 0.00 0.0671 0.0242 0.0242 0.058 0.2387
PROJECT RECORD 16
1580.00 0.00 0.00 0.058 0.021 0.021 0.0501 0.2063
1590.00 0.00 0.00 0.0501 0.0181 0.0181 0.0433 0.1783
1600.00 0.00 0.00 0.0433 0.0157 0.0157 0.0374 0.1541
1610.00 0.00 0.00 0.0374 0.0135 0.0135 0.0324 0.1332
1620.00 0.00 0.00 0.0324 0.0117 0.0117 0.028 0.1152
1630.00 0.00 0.00 0.028 0.0101 0.0101 0.0242 0.0996
1640.00 0.00 0.00 0.0242 0.0087 0.0087 0.0209 0.0861
1650.00 0.00 0.00 0.0209 0.0076 0.0076 0.0181 0.0744
1660.00 0.00 0.00 0.0181 0.0065 0.0065 0.0156 0.0643
1670.00 0.00 0.00 0.0156 0.0056 0.0056 0.0135 0.0556
1680.00 0.00 0.00 0.0135 0.0049 0.0049 0.0117 0.048
1690.00 0.00 0.00 0.0117 0.0042 0.0042 0.0101 0.0415
1700.00 0.00 0.00 0.0101 0.0036 0.0036 0.0087 0.0359
Routing Table for 10 year Event
Time (min) Inflow (cfs) AvgI (cf) Stg (ft), S-0dt/2 (acft) S+0dt/2 (acft) Stg (ft) Outflow (cfs)
0.00 0.016 0.00 0.00 0.00 0.00 0.00 0.00
10.00 0.0674 25.0356 0.00 0.00 0.0006 0.0014 0.0057
20.00 0.1504 65.3286 0.0014 0.0005 0.002 0.0048 0.0197
30.00 0.2348 115.5585 0.0048 0.0017 0.0044 0.0105 0.0431
40.00 0.3028 161.3027 0.0105 0.0038 0.0075 0.0179 0.0737
50.00 0.3745 203.1939 0.0179 0.0065 0.0111 0.0266 0.1096
60.00 0.4418 244.8868 0.0266 0.0096 0.0152 0.0365 0.1501
70.00 0.4912 279.8879 0.0365 0.0132 0.0196 0.0469 0.193
80.00 0.5511 312.6826 0.0469 0.0169 0.0241 0.0577 0.2375
90.00 0.6088 347.9649 0.0577 0.0209 0.0288 0.069 0.2839
100.00 0.6458 376.3626 0.069 0.0249 0.0336 0.0803 0.3305
110.00 0.6773 396.9152 0.0803 0.029 0.0381 0.0912 0.3754
120.00 0.7049 414.6413 0.0912 0.033 0.0425 0.1016 0.4144
130.00 0.7292 430.234 0.1016 0.0368 0.0466 0.1119 0.432
140.00 0.7509 444.0361 0.1119 0.0407 0.0509 0.1224 0.4498
150.00 0.7702 456.3125 0.1224 0.0447 0.0552 0.133 0.4678
160.00 0.7874 467.2806 0.133 0.0487 0.0595 0.1435 0.4859
170.00 0.8281 484.6523 0.1435 0.0528 0.0639 0.1545 0.5045
180.00 0.8723 510.1083 0.1545 0.0569 0.0686 0.1662 0.5246
PROJECT RECORD 17
190.00 0.8946 530.0652 0.1662 0.0614 0.0736 0.1784 0.5454
200.00 0.9664 558.3066 0.1784 0.0661 0.0789 0.1915 0.5677
210.00 1.0432 602.8832 0.1915 0.0711 0.0849 0.2064 0.5905
220.00 1.0706 634.1349 0.2064 0.0768 0.0913 0.2222 0.6112
230.00 1.1472 665.3411 0.2222 0.0829 0.0982 0.2391 0.6333
240.00 1.2282 712.6263 0.2391 0.0895 0.1058 0.2579 0.6579
250.00 1.257 745.5635 0.2579 0.0968 0.1139 0.2778 0.6838
260.00 1.3365 778.0443 0.2778 0.1045 0.1223 0.2985 0.711
270.00 1.4204 827.0734 0.2985 0.1125 0.1315 0.3211 0.7362
280.00 1.4499 861.0912 0.3211 0.1214 0.1411 0.3447 0.7622
290.00 1.5315 894.4042 0.3447 0.1307 0.1512 0.3692 0.7893
300.00 1.6176 944.7307 0.3692 0.1403 0.162 0.3957 0.8185
310.00 1.6475 979.5303 0.3957 0.1507 0.1732 0.423 0.8456
320.00 1.7898 1031.1718 0.423 0.1616 0.1852 0.4523 0.8741
330.00 1.9437 1120.0355 0.4523 0.1732 0.1989 0.4856 0.9064
340.00 1.9834 1178.1106 0.4856 0.1864 0.2135 0.5209 0.9387
350.00 2.194 1253.2006 0.5209 0.2005 0.2293 0.5591 0.9724
360.00 2.423 1385.0942 0.5591 0.2159 0.2477 0.6036 1.0111
370.00 2.4769 1469.9595 0.6036 0.2338 0.2675 0.6511 1.0495
380.00 2.7307 1562.2809 0.6511 0.2531 0.2889 0.7024 1.0908
390.00 3.0062 1721.0816 0.7024 0.2739 0.3134 0.7606 1.1346
400.00 3.0723 1823.5516 0.7606 0.2978 0.3397 0.8228 1.1803
410.00 5.4372 2552.8505 0.8228 0.3234 0.382 0.9225 1.2499
420.00 8.1065 4063.1143 0.9225 0.3648 0.4581 1.0997 1.365
430.00 8.5904 5009.0633 1.0997 0.4393 0.5543 1.3109 2.0683
440.00 6.8887 4643.7244 1.3109 0.5258 0.6324 1.4817 2.5099
450.00 4.854 3522.8063 1.4817 0.5978 0.6787 1.5826 2.7175
460.00 4.6339 2846.3639 1.5826 0.6412 0.7066 1.6431 2.8306
470.00 4.079 2613.8792 1.6431 0.6676 0.7276 1.6886 2.913
480.00 3.4947 2272.1175 1.6886 0.6875 0.7396 1.7146 2.9581
490.00 3.398 2067.8171 1.7146 0.6989 0.7464 1.7291 2.9823
500.00 3.0275 1927.6516 1.7291 0.7053 0.7495 1.7359 2.9937
510.00 2.633 1698.1612 1.7359 0.7083 0.7473 1.7311 2.9856
520.00 2.5652 1559.4744 1.7311 0.7062 0.742 1.7196 2.9664
PROJECT RECORD 18
530.00 2.4371 1500.6912 1.7196 0.7011 0.7356 1.7058 2.9434
540.00 2.3096 1424.0053 1.7058 0.695 0.7277 1.6888 2.9134
550.00 2.2848 1378.3188 1.6888 0.6876 0.7192 1.6705 2.8801
560.00 2.1742 1337.7099 1.6705 0.6795 0.7103 1.6511 2.845
570.00 2.056 1269.0653 1.6511 0.6711 0.7002 1.6293 2.8055
580.00 2.0364 1227.7236 1.6293 0.6616 0.6897 1.6066 2.7645
590.00 1.9619 1199.4793 1.6066 0.6517 0.6792 1.5837 2.7198
600.00 1.8826 1153.3296 1.5837 0.6417 0.6682 1.5598 2.6719
610.00 1.8694 1125.6044 1.5598 0.6314 0.6573 1.5359 2.624
620.00 1.8309 1110.1126 1.5359 0.6211 0.6466 1.5127 2.5775
630.00 1.7909 1086.5514 1.5127 0.6111 0.636 1.4897 2.5283
640.00 1.7844 1072.5994 1.4897 0.6012 0.6258 1.4674 2.4771
650.00 1.7487 1059.9367 1.4674 0.5917 0.616 1.446 2.4279
660.00 1.71 1037.6172 1.446 0.5826 0.6064 1.425 2.3796
670.00 1.7043 1024.3031 1.425 0.5737 0.5972 1.4047 2.333
680.00 1.6688 1011.9366 1.4047 0.565 0.5883 1.3853 2.2802
690.00 1.6302 989.6924 1.3853 0.5569 0.5796 1.3663 2.226
700.00 1.6243 976.3455 1.3663 0.5489 0.5713 1.3482 2.1746
710.00 1.5886 963.8831 1.3482 0.5414 0.5635 1.3311 2.1259
720.00 1.5497 941.4904 1.3311 0.5342 0.5558 1.3144 2.0781
730.00 1.5436 927.9859 1.3144 0.5272 0.5485 1.2984 2.0275
740.00 1.5415 925.5398 1.2984 0.5206 0.5418 1.2844 1.9418
750.00 1.5408 924.714 1.2844 0.5151 0.5363 1.2728 1.8709
760.00 1.5409 924.5351 1.2728 0.5105 0.5318 1.2633 1.8126
770.00 1.5075 914.5294 1.2633 0.5068 0.5278 1.2549 1.7616
780.00 1.4697 893.1523 1.2549 0.5035 0.524 1.247 1.7133
790.00 1.4642 880.157 1.247 0.5004 0.5206 1.2399 1.6698
800.00 1.4624 877.9627 1.2399 0.4976 0.5178 1.2339 1.6332
810.00 1.4617 877.2313 1.2339 0.4953 0.5154 1.229 1.603
820.00 1.4618 877.0526 1.229 0.4934 0.5135 1.2249 1.578
830.00 1.4281 866.9669 1.2249 0.4918 0.5117 1.221 1.5545
840.00 1.39 845.4424 1.221 0.4903 0.5097 1.2168 1.5288
850.00 1.3843 832.2905 1.2168 0.4886 0.5077 1.2127 1.5037
860.00 1.3822 829.9578 1.2127 0.487 0.506 1.2092 1.4824
PROJECT RECORD 19
870.00 1.3814 829.0962 1.2092 0.4856 0.5047 1.2063 1.4646
880.00 1.3812 828.7931 1.2063 0.4845 0.5035 1.2039 1.4499
890.00 1.3473 818.5662 1.2039 0.4835 0.5023 1.2014 1.4348
900.00 1.3089 796.8741 1.2014 0.4826 0.5009 1.1982 1.4248
910.00 1.303 783.5655 1.1982 0.4812 0.4992 1.1944 1.4225
920.00 1.3007 781.1027 1.1944 0.4796 0.4976 1.1906 1.4202
930.00 1.2997 780.1248 1.1906 0.478 0.4959 1.1868 1.4179
940.00 1.2993 779.7143 1.1868 0.4764 0.4943 1.1831 1.4156
950.00 1.2994 779.6239 1.1831 0.4748 0.4927 1.1794 1.4134
960.00 1.2997 779.7237 1.1794 0.4732 0.4911 1.1758 1.4112
970.00 1.3001 779.9366 1.1758 0.4717 0.4896 1.1722 1.409
980.00 1.2664 769.9514 1.1722 0.4702 0.4878 1.1682 1.4066
990.00 1.228 748.3148 1.1682 0.4685 0.4857 1.1632 1.4036
1000.00 1.222 734.9824 1.1632 0.4663 0.4832 1.1575 1.4001
1010.00 1.2196 732.473 1.1575 0.4639 0.4807 1.1518 1.3967
1020.00 1.2185 731.4315 1.1518 0.4615 0.4783 1.1462 1.3932
1030.00 1.218 730.9477 1.1462 0.4591 0.4759 1.1407 1.3899
1040.00 1.1837 720.4988 1.1407 0.4567 0.4733 1.1347 1.3862
1050.00 1.1448 698.5263 1.1347 0.4542 0.4702 1.1276 1.382
1060.00 1.1384 684.9539 1.1276 0.4512 0.4669 1.12 1.3773
1070.00 1.1358 682.2769 1.12 0.4479 0.4636 1.1124 1.3727
1080.00 1.1345 681.11 1.1124 0.4447 0.4603 1.1049 1.3681
1090.00 1.1339 680.5264 1.1049 0.4415 0.4571 1.0974 1.3636
1100.00 1.0994 669.9807 1.0974 0.4383 0.4537 1.0895 1.3585
1110.00 1.0603 647.9026 1.0895 0.435 0.4499 1.0806 1.3529
1120.00 1.0538 634.2356 1.0806 0.4312 0.4458 1.0712 1.3469
1130.00 1.0511 631.483 1.0712 0.4272 0.4417 1.0617 1.3409
1140.00 1.0497 630.2505 1.0617 0.4233 0.4377 1.0525 1.335
1150.00 1.049 629.6075 1.0525 0.4193 0.4338 1.0433 1.3292
1160.00 1.0487 629.2993 1.0433 0.4155 0.4299 1.0344 1.3235
1170.00 1.0486 629.1914 1.0344 0.4117 0.4261 1.0256 1.3179
1180.00 1.0487 629.2039 1.0256 0.408 0.4224 1.017 1.3124
1190.00 1.0489 629.2885 1.017 0.4044 0.4188 1.0085 1.3071
1200.00 1.0491 629.416 1.0085 0.4008 0.4152 1.0003 1.3019
PROJECT RECORD 20
1210.00 1.0494 629.5687 1.0003 0.3973 0.4118 0.9922 1.2964
1220.00 1.0497 629.7361 0.9922 0.3939 0.4084 0.9842 1.2911
1230.00 1.05 629.9115 0.9842 0.3906 0.405 0.9764 1.2859
1240.00 1.0503 630.0912 0.9764 0.3873 0.4018 0.9688 1.2808
1250.00 1.0506 630.2727 0.9688 0.3842 0.3986 0.9614 1.2759
1260.00 1.0509 630.4547 0.9614 0.381 0.3955 0.9541 1.271
1270.00 1.0512 630.6363 0.9541 0.378 0.3925 0.947 1.2663
1280.00 1.0171 620.492 0.947 0.375 0.3893 0.9396 1.2613
1290.00 0.9781 598.5692 0.9396 0.3719 0.3857 0.9311 1.2556
1300.00 0.9717 584.9472 0.9311 0.3684 0.3818 0.922 1.2496
1310.00 0.969 582.2027 0.922 0.3646 0.3779 0.913 1.2436
1320.00 0.9675 580.952 0.913 0.3608 0.3742 0.9041 1.2376
1330.00 0.9667 580.2751 0.9041 0.3571 0.3704 0.8954 1.2316
1340.00 0.9663 579.9236 0.8954 0.3535 0.3668 0.8868 1.2255
1350.00 0.9662 579.7672 0.8868 0.3499 0.3632 0.8784 1.2196
1360.00 0.9662 579.7281 0.8784 0.3464 0.3597 0.8701 1.2138
1370.00 0.9663 579.7597 0.8701 0.343 0.3563 0.8621 1.2081
1380.00 0.9665 579.8335 0.8621 0.3397 0.353 0.8542 1.2025
1390.00 0.9666 579.9325 0.8542 0.3364 0.3497 0.8466 1.1971
1400.00 0.5877 466.2891 0.8466 0.3332 0.3439 0.8329 1.1875
1410.00 0.1552 222.8521 0.8329 0.3276 0.3327 0.8064 1.1688
1420.00 0.0809 70.8314 0.8064 0.3166 0.3182 0.772 1.1432
1430.00 0.0481 38.7111 0.772 0.3025 0.3034 0.7367 1.1166
1440.00 0.0291 23.1526 0.7367 0.288 0.2885 0.7014 1.0901
1450.00 0.0176 13.9908 0.7014 0.2735 0.2738 0.6662 1.0617
1460.00 0.0106 8.4656 0.6662 0.2592 0.2594 0.6316 1.0338
1470.00 0.0064 5.1223 0.6316 0.2452 0.2453 0.5977 1.0062
1480.00 0.0039 3.0994 0.5977 0.2314 0.2315 0.5644 0.977
1490.00 0.0024 1.8754 0.5644 0.218 0.2181 0.532 0.9485
1500.00 0.0014 1.1348 0.532 0.205 0.205 0.5005 0.9208
1510.00 0.0009 0.6866 0.5005 0.1924 0.1924 0.4697 0.8909
1520.00 0.0005 0.4155 0.4697 0.1801 0.1801 0.4398 0.8619
1530.00 0.0003 0.2514 0.4398 0.1682 0.1682 0.4109 0.8339
1540.00 0.0002 0.1521 0.4109 0.1568 0.1568 0.3829 0.8044
PROJECT RECORD 21
1550.00 0.0001 0.092 0.3829 0.1457 0.1457 0.3558 0.7744
1560.00 0.00 0.0347 0.3558 0.135 0.135 0.3296 0.7456
1570.00 0.00 0.00 0.3296 0.1247 0.1247 0.3045 0.7179
1580.00 0.00 0.00 0.3045 0.1149 0.1149 0.2801 0.687
1590.00 0.00 0.00 0.2801 0.1054 0.1054 0.2568 0.6565
1600.00 0.00 0.00 0.2568 0.0963 0.0963 0.2346 0.6273
1610.00 0.00 0.00 0.2346 0.0877 0.0877 0.2133 0.5995
1620.00 0.00 0.00 0.2133 0.0795 0.0795 0.1929 0.57
1630.00 0.00 0.00 0.1929 0.0716 0.0716 0.1735 0.537
1640.00 0.00 0.00 0.1735 0.0642 0.0642 0.1553 0.5059
1650.00 0.00 0.00 0.1553 0.0572 0.0572 0.1381 0.4765
1660.00 0.00 0.00 0.1381 0.0507 0.0507 0.1219 0.4489
1670.00 0.00 0.00 0.1219 0.0445 0.0445 0.1066 0.4229
1680.00 0.00 0.00 0.1066 0.0387 0.0387 0.0925 0.3806
1690.00 0.00 0.00 0.0925 0.0334 0.0334 0.0799 0.329
1700.00 0.00 0.00 0.0799 0.0289 0.0289 0.0691 0.2844
1710.00 0.00 0.00 0.0691 0.025 0.025 0.0597 0.2458
1720.00 0.00 0.00 0.0597 0.0216 0.0216 0.0516 0.2125
1730.00 0.00 0.00 0.0516 0.0187 0.0187 0.0446 0.1837
1740.00 0.00 0.00 0.0446 0.0161 0.0161 0.0386 0.1588
1750.00 0.00 0.00 0.0386 0.0139 0.0139 0.0333 0.1372
1760.00 0.00 0.00 0.0333 0.0121 0.0121 0.0288 0.1186
1770.00 0.00 0.00 0.0288 0.0104 0.0104 0.0249 0.1025
1780.00 0.00 0.00 0.0249 0.009 0.009 0.0215 0.0886
1790.00 0.00 0.00 0.0215 0.0078 0.0078 0.0186 0.0766
1800.00 0.00 0.00 0.0186 0.0067 0.0067 0.0161 0.0662
1810.00 0.00 0.00 0.0161 0.0058 0.0058 0.0139 0.0572
1820.00 0.00 0.00 0.0139 0.005 0.005 0.012 0.0495
1830.00 0.00 0.00 0.012 0.0043 0.0043 0.0104 0.0428
1840.00 0.00 0.00 0.0104 0.0038 0.0038 0.009 0.037
Routing Table for 100 year Event
Time (min) Inflow (cfs) AvgI (cf) Stg (ft), S-0dt/2 (acft) S+0dt/2 (acft) Stg (ft) Outflow (cfs)
0.00 0.0284 0.00 0.00 0.00 0.00 0.00 0.00
10.00 0.1203 44.6169 0.00 0.00 0.001 0.0024 0.0101
PROJECT RECORD 22
20.00 0.2384 107.6131 0.0024 0.0009 0.0034 0.008 0.033
30.00 0.3717 183.0323 0.008 0.0029 0.0071 0.017 0.0699
40.00 0.5013 261.9179 0.017 0.0061 0.0122 0.0291 0.1196
50.00 0.5928 328.25 0.0291 0.0105 0.018 0.0431 0.1776
60.00 0.6919 385.4143 0.0431 0.0156 0.0244 0.0585 0.2406
70.00 0.7836 442.6327 0.0585 0.0211 0.0313 0.0748 0.308
80.00 0.8439 488.2281 0.0748 0.027 0.0383 0.0915 0.3766
90.00 0.9229 530.021 0.0915 0.0331 0.0452 0.1084 0.426
100.00 0.9985 576.4054 0.1084 0.0394 0.0526 0.1266 0.457
110.00 1.0408 611.776 0.1266 0.0463 0.0603 0.1458 0.4896
120.00 1.0755 634.887 0.1458 0.0536 0.0682 0.1651 0.5226
130.00 1.1076 654.9272 0.1651 0.061 0.076 0.1844 0.5556
140.00 1.1404 674.3942 0.1844 0.0684 0.0838 0.2038 0.587
150.00 1.174 694.3225 0.2038 0.0758 0.0917 0.2231 0.6123
160.00 1.207 714.3019 0.2231 0.0833 0.0997 0.2427 0.638
170.00 1.2387 733.719 0.2427 0.0909 0.1077 0.2626 0.664
180.00 1.3058 763.3557 0.2626 0.0986 0.1161 0.2832 0.691
190.00 1.3753 804.33 0.2832 0.1066 0.125 0.3052 0.7187
200.00 1.408 834.9885 0.3052 0.1151 0.1343 0.3279 0.7437
210.00 1.5135 876.4412 0.3279 0.1241 0.1442 0.3521 0.7704
220.00 1.6257 941.7531 0.3521 0.1336 0.1552 0.3791 0.8002
230.00 1.6628 986.5555 0.3791 0.1442 0.1668 0.4075 0.8305
240.00 1.7724 1030.5749 0.4075 0.1554 0.179 0.4372 0.8594
250.00 1.8887 1098.3333 0.4372 0.1672 0.1924 0.4698 0.8911
260.00 1.927 1144.7072 0.4698 0.1801 0.2064 0.5038 0.9238
270.00 2.0395 1189.9531 0.5038 0.1937 0.221 0.5391 0.9548
280.00 2.1588 1259.4984 0.5391 0.2079 0.2368 0.5772 0.9882
290.00 2.1979 1307.0065 0.5772 0.2232 0.2532 0.6166 1.0217
300.00 2.3125 1353.1121 0.6166 0.2391 0.2702 0.6574 1.0546
310.00 2.4342 1424.0033 0.6574 0.2556 0.2883 0.7009 1.0897
320.00 2.4736 1472.3241 0.7009 0.2733 0.3071 0.7456 1.1233
330.00 2.6756 1544.7646 0.7456 0.2916 0.3271 0.7931 1.1591
340.00 2.8955 1671.3424 0.7931 0.3111 0.3495 0.846 1.1968
350.00 2.95 1753.6427 0.846 0.333 0.3733 0.9021 1.2363
PROJECT RECORD 23
360.00 3.2496 1859.8782 0.9021 0.3563 0.399 0.9622 1.2764
370.00 3.577 2047.9786 0.9622 0.3814 0.4284 1.0308 1.3212
380.00 3.6522 2168.7396 1.0308 0.4102 0.46 1.1041 1.3677
390.00 4.0119 2299.2107 1.1041 0.4411 0.4939 1.1822 1.4151
400.00 4.4034 2524.5872 1.1822 0.4744 0.5324 1.2646 1.8205
410.00 4.4952 2669.5778 1.2646 0.5073 0.5686 1.3423 2.1576
420.00 7.8567 3705.5565 1.3423 0.5389 0.6239 1.4633 2.4676
430.00 11.6648 5856.4583 1.4633 0.59 0.7244 1.6817 2.9005
440.00 12.3639 7208.6108 1.6817 0.6844 0.8499 1.9417 3.9228
450.00 9.9573 6696.3573 1.9417 0.7959 0.9496 2.1468 4.5644
460.00 7.0552 5103.7713 2.1468 0.8868 1.0039 2.2579 4.854
470.00 6.702 4127.1754 2.2579 0.9371 1.0318 2.3147 4.9939
480.00 5.8903 3777.682 2.3147 0.963 1.0498 2.3511 5.079
490.00 5.0419 3279.6605 2.3511 0.9798 1.0551 2.3619 5.1043
500.00 4.8832 2977.5562 2.3619 0.9848 1.0531 2.358 5.095
510.00 4.347 2769.0652 2.358 0.983 1.0465 2.3446 5.0637
520.00 3.779 2437.7992 2.3446 0.9768 1.0327 2.3166 4.9982
530.00 3.6711 2235.049 2.3166 0.9639 1.0152 2.2809 4.9116
540.00 3.4827 2146.1433 2.2809 0.9475 0.9968 2.2434 4.8177
550.00 3.2968 2033.8372 2.2434 0.9305 0.9771 2.2032 4.7172
560.00 3.2562 1965.8917 2.2032 0.9122 0.9573 2.1625 4.6072
570.00 3.0969 1905.9252 2.1625 0.8938 0.9376 2.1221 4.4972
580.00 2.9272 1807.2252 2.1221 0.8757 0.9171 2.0801 4.3765
590.00 2.8959 1746.9178 2.0801 0.8569 0.897 2.0385 4.2502
600.00 2.7886 1705.3325 2.0385 0.8384 0.8776 1.9986 4.1281
610.00 2.6748 1639.0131 1.9986 0.8207 0.8583 1.959 3.9852
620.00 2.6537 1598.5658 1.959 0.8034 0.8401 1.9216 3.85
630.00 2.5978 1575.4728 1.9216 0.7871 0.8233 1.8873 3.6871
640.00 2.5399 1541.3265 1.8873 0.7725 0.8079 1.8567 3.4816
650.00 2.5291 1520.7092 1.8567 0.7599 0.7948 1.8308 3.3076
660.00 2.4777 1502.0392 1.8308 0.7493 0.7837 1.8088 3.1599
670.00 2.4222 1469.9649 1.8088 0.7402 0.774 1.7885 3.0816
680.00 2.4127 1450.4774 1.7885 0.7315 0.7648 1.7688 3.0487
690.00 2.3619 1432.40 1.7688 0.7228 0.7557 1.7492 3.0159
PROJECT RECORD 24
700.00 2.3067 1400.5808 1.7492 0.7142 0.7463 1.729 2.9821
710.00 2.2972 1381.1684 1.729 0.7052 0.737 1.7088 2.9484
720.00 2.2463 1363.0603 1.7088 0.6963 0.7276 1.6887 2.9132
730.00 2.1908 1331.1334 1.6887 0.6875 0.7181 1.668 2.8756
740.00 2.1812 1311.5878 1.668 0.6785 0.7086 1.6474 2.8383
750.00 2.1773 1307.5419 1.6474 0.6695 0.6995 1.6277 2.8027
760.00 2.1756 1305.8713 1.6277 0.6609 0.6909 1.6091 2.7689
770.00 2.175 1305.1792 1.6091 0.6527 0.6827 1.5913 2.735
780.00 2.1277 1290.8228 1.5913 0.645 0.6746 1.5738 2.6999
790.00 2.0741 1260.5635 1.5738 0.6375 0.6664 1.5558 2.6639
800.00 2.0656 1241.9125 1.5558 0.6297 0.6582 1.538 2.6282
810.00 2.0623 1238.35 1.538 0.622 0.6504 1.5211 2.5943
820.00 2.0608 1236.9139 1.5211 0.6147 0.6431 1.5051 2.5623
830.00 2.0603 1236.3068 1.5051 0.6078 0.6362 1.49 2.5291
840.00 2.0128 1221.9237 1.49 0.6014 0.6294 1.4752 2.495
850.00 1.959 1191.5522 1.4752 0.595 0.6224 1.4599 2.4598
860.00 1.9502 1172.7666 1.4599 0.5885 0.6154 1.4447 2.4248
870.00 1.9467 1169.0785 1.4447 0.582 0.6089 1.4303 2.3919
880.00 1.945 1167.5204 1.4303 0.5759 0.6027 1.4169 2.361
890.00 1.9443 1166.7945 1.4169 0.5702 0.597 1.4044 2.3322
900.00 1.8966 1152.276 1.4044 0.5649 0.5913 1.392 2.2993
910.00 1.8425 1121.7436 1.392 0.5597 0.5854 1.379 2.2624
920.00 1.8335 1102.8064 1.379 0.5542 0.5796 1.3662 2.226
930.00 1.8298 1098.9914 1.3662 0.5489 0.5741 1.3544 2.1921
940.00 1.8279 1097.3197 1.3544 0.5439 0.5691 1.3434 2.1609
950.00 1.827 1096.4891 1.3434 0.5394 0.5645 1.3334 2.1323
960.00 1.8267 1096.1358 1.3334 0.5352 0.5603 1.3242 2.1061
970.00 1.8268 1096.0674 1.3242 0.5313 0.5565 1.3158 2.0821
980.00 1.8271 1096.1693 1.3158 0.5278 0.553 1.3081 2.0602
990.00 1.7799 1082.0835 1.3081 0.5246 0.5494 1.3004 2.0382
1000.00 1.7259 1051.7268 1.3004 0.5214 0.5455 1.2921 1.9889
1010.00 1.7169 1032.8399 1.2921 0.5181 0.5418 1.2844 1.9416
1020.00 1.7132 1029.023 1.2844 0.5151 0.5387 1.2778 1.9015
1030.00 1.7112 1027.3158 1.2778 0.5125 0.5361 1.2723 1.868
PROJECT RECORD 25
1040.00 1.7102 1026.4297 1.2723 0.5104 0.5339 1.2678 1.8402
1050.00 1.6621 1011.707 1.2678 0.5086 0.5318 1.2633 1.813
1060.00 1.6076 980.9129 1.2633 0.5068 0.5293 1.2582 1.7815
1070.00 1.5982 961.7261 1.2582 0.5048 0.5269 1.253 1.7499
1080.00 1.5942 957.7059 1.253 0.5028 0.5248 1.2486 1.7227
1090.00 1.592 955.8527 1.2486 0.501 0.523 1.2448 1.6998
1100.00 1.5908 954.8555 1.2448 0.4996 0.5215 1.2417 1.6806
1110.00 1.5426 940.0314 1.2417 0.4983 0.5199 1.2384 1.6605
1120.00 1.4879 909.132 1.2384 0.497 0.5179 1.2342 1.6348
1130.00 1.4783 889.8523 1.2342 0.4954 0.5158 1.2298 1.608
1140.00 1.4742 885.7581 1.2298 0.4937 0.514 1.226 1.5847
1150.00 1.4719 883.8413 1.226 0.4922 0.5125 1.2228 1.565
1160.00 1.4707 882.7869 1.2228 0.4909 0.5112 1.22 1.5484
1170.00 1.4701 882.2243 1.22 0.4899 0.5101 1.2178 1.5346
1180.00 1.4698 881.9565 1.2178 0.489 0.5092 1.2159 1.5232
1190.00 1.4698 881.8663 1.2159 0.4882 0.5085 1.2144 1.5137
1200.00 1.4699 881.8827 1.2144 0.4876 0.5079 1.2131 1.506
1210.00 1.47 881.963 1.2131 0.4871 0.5074 1.2121 1.4996
1220.00 1.4702 882.0812 1.2121 0.4867 0.507 1.2112 1.4944
1230.00 1.4705 882.2217 1.2112 0.4864 0.5066 1.2105 1.4901
1240.00 1.4708 882.3749 1.2105 0.4861 0.5064 1.2099 1.4867
1250.00 1.471 882.5352 1.2099 0.4859 0.5062 1.2095 1.4839
1260.00 1.4713 882.699 1.2095 0.4857 0.506 1.2091 1.4816
1270.00 1.4716 882.8644 1.2091 0.4856 0.5058 1.2088 1.4798
1280.00 1.4719 883.03 1.2088 0.4855 0.5057 1.2086 1.4784
1290.00 1.4243 868.8517 1.2086 0.4854 0.5053 1.2077 1.473
1300.00 1.3699 838.2621 1.2077 0.485 0.5043 1.2055 1.4596
1310.00 1.3605 819.1232 1.2055 0.4842 0.503 1.2028 1.4429
1320.00 1.3565 815.095 1.2028 0.4831 0.5018 1.2003 1.428
1330.00 1.3542 813.1962 1.2003 0.4821 0.5008 1.1981 1.4247
1340.00 1.3529 812.1309 1.1981 0.4812 0.4998 1.1958 1.4234
1350.00 1.3522 811.5399 1.1958 0.4802 0.4989 1.1936 1.422
1360.00 1.3519 811.2337 1.1936 0.4793 0.4979 1.1914 1.4207
1370.00 1.3518 811.0992 1.1914 0.4783 0.4969 1.1892 1.4193
PROJECT RECORD 26
1380.00 1.3518 811.0681 1.1892 0.4774 0.496 1.187 1.418
1390.00 1.3519 811.0991 1.187 0.4765 0.4951 1.1849 1.4168
1400.00 1.352 811.1673 1.1849 0.4756 0.4942 1.1829 1.4155
1410.00 0.8257 653.3174 1.1829 0.4747 0.4897 1.1725 1.4092
1420.00 0.2234 314.7385 1.1725 0.4703 0.4775 1.1445 1.3922
1430.00 0.1173 102.212 1.1445 0.4583 0.4607 1.1057 1.3687
1440.00 0.0698 56.1296 1.1057 0.4418 0.4431 1.065 1.343
1450.00 0.0422 33.5898 1.065 0.4246 0.4254 1.0239 1.3168
1460.00 0.0255 20.2992 1.0239 0.4073 0.4077 0.9827 1.2901
1470.00 0.0154 12.2827 0.9827 0.39 0.3902 0.9418 1.2628
1480.00 0.0093 7.432 0.9418 0.3728 0.373 0.9015 1.2359
1490.00 0.0057 4.4969 0.9015 0.356 0.3561 0.8616 1.2077
1500.00 0.0034 2.721 0.8616 0.3395 0.3395 0.8225 1.1801
1510.00 0.0021 1.6464 0.8225 0.3233 0.3233 0.7841 1.1523
1520.00 0.0013 0.9962 0.7841 0.3074 0.3075 0.7464 1.1239
1530.00 0.0008 0.6028 0.7464 0.292 0.292 0.7096 1.0963
1540.00 0.0005 0.3647 0.7096 0.2769 0.2769 0.6735 1.0677
1550.00 0.0003 0.2207 0.6735 0.2622 0.2622 0.6383 1.0392
1560.00 0.0002 0.1335 0.6383 0.2479 0.2479 0.604 1.0115
1570.00 0.0001 0.0808 0.604 0.234 0.234 0.5703 0.9822
1580.00 0.00 0.0305 0.5703 0.2204 0.2204 0.5377 0.9535
1590.00 0.00 0.00 0.5377 0.2073 0.2073 0.5059 0.9256
1600.00 0.00 0.00 0.5059 0.1945 0.1945 0.475 0.8961
1610.00 0.00 0.00 0.475 0.1822 0.1822 0.4449 0.8669
1620.00 0.00 0.00 0.4449 0.1703 0.1703 0.4159 0.8387
1630.00 0.00 0.00 0.4159 0.1587 0.1587 0.3877 0.8097
1640.00 0.00 0.00 0.3877 0.1476 0.1476 0.3604 0.7795
1650.00 0.00 0.00 0.3604 0.1368 0.1368 0.3341 0.7505
1660.00 0.00 0.00 0.3341 0.1265 0.1265 0.3087 0.7226
1670.00 0.00 0.00 0.3087 0.1165 0.1165 0.2843 0.6924
1680.00 0.00 0.00 0.2843 0.107 0.107 0.2608 0.6616
1690.00 0.00 0.00 0.2608 0.0979 0.0979 0.2383 0.6323
1700.00 0.00 0.00 0.2383 0.0892 0.0892 0.2169 0.6042
1710.00 0.00 0.00 0.2169 0.0808 0.0808 0.1964 0.5759
PROJECT RECORD 27
1720.00 0.00 0.00 0.1964 0.0729 0.0729 0.1768 0.5425
1730.00 0.00 0.00 0.1768 0.0654 0.0654 0.1583 0.5111
1740.00 0.00 0.00 0.1583 0.0584 0.0584 0.141 0.4815
1750.00 0.00 0.00 0.141 0.0518 0.0518 0.1246 0.4535
1760.00 0.00 0.00 0.1246 0.0455 0.0455 0.1092 0.4273
1770.00 0.00 0.00 0.1092 0.0396 0.0396 0.0948 0.3902
1780.00 0.00 0.00 0.0948 0.0343 0.0343 0.082 0.3373
1790.00 0.00 0.00 0.082 0.0296 0.0296 0.0708 0.2916
1800.00 0.00 0.00 0.0708 0.0256 0.0256 0.0612 0.252
1810.00 0.00 0.00 0.0612 0.0221 0.0221 0.0529 0.2179
1820.00 0.00 0.00 0.0529 0.0191 0.0191 0.0458 0.1883
1830.00 0.00 0.00 0.0458 0.0165 0.0165 0.0395 0.1628
1840.00 0.00 0.00 0.0395 0.0143 0.0143 0.0342 0.1407
1850.00 0.00 0.00 0.0342 0.0124 0.0124 0.0295 0.1216
1860.00 0.00 0.00 0.0295 0.0107 0.0107 0.0255 0.1051
1870.00 0.00 0.00 0.0255 0.0092 0.0092 0.0221 0.0909
1880.00 0.00 0.00 0.0221 0.008 0.008 0.0191 0.0786
1890.00 0.00 0.00 0.0191 0.0069 0.0069 0.0165 0.0679
1900.00 0.00 0.00 0.0165 0.006 0.006 0.0143 0.0587
1910.00 0.00 0.00 0.0143 0.0052 0.0052 0.0123 0.0507
1920.00 0.00 0.00 0.0123 0.0045 0.0045 0.0107 0.0439
1930.00 0.00 0.00 0.0107 0.0039 0.0039 0.0092 0.0379
PROJECT RECORD 28
Southport Wetvault Sizing Calculations
Following the procedure outlined in 6.4.1.1 of the King County Stormwater Design Manual:
Step 1: Identify required wetpool volume factor
= 3 ( )
Step 2: Determine rainfall (R) for the mean annual storm
6.4.1.,
= 0.47" = 0.039′
PROJECT RECORD 29
Step 3: Calculate runoff from the mean annual storm
= !0.9 "+ 0.25 &’+ 0.10 &(+ 0.01 )*
"= 190,000 +
&’= 0.00 +
&(= 0.00 +
)= 0.00 +
=( 0.039 ,)(0.9)(190,000 +)
= 6,669 -
Step 4: Calculate required wetpool volume
.=
.=(3)(6,669 -)
.= 20,007 -
With inside dimensions of 178.5’ x 25’, and a live storage depth of 4.8’, the provided volume of the existing
vault is approximately 21,420 CF, so,
21,420 - > 20,007 -
0 )1"232 > 345" 32
Therefore, the existing vault is adequate for reuse as a wetvault to provide basic water quality
treatment.
Additionally, the existing wetvault must meet the requirements of City of Renton Amendment to KCSWDM
Section 6.4.2.
PROJECT Southport Hotel DESIGNED BY BGG DATE 04/01/2015
PROJECT NUMBER C140507-01 CLIENT MG2 CHECKED BY BSB SHEET OF
LONGACRES BUSINESS CENTER PHASE II 29
Appendix B
Geotechnical Report, Long Acres Phase II
Prepared for Ryan Companies by Terra Associates, Inc.
Dated May 19, 2015
LONGACRES BUSINESS CENTER PHASE II 30
Appendix C
STORMWATER POLLUTION PREVENTION PLAN (SWPPP)
TO BE INCLUDED AT TIME OF PERMIT SUBMITTAL