HomeMy WebLinkAboutSWP272794 2 ?9q
CITY OF RENTON
ECONOMIC DEVELOPMENT
NEIGHBORHOODS, AND STRATEGIC PLANNING
MEMORANDUM
DATE: July 2, 1999
TO: Mike Dotson
FROM: Arneta Henninger X7298
SUBJECT: STORM DRAINAGE REPORT KLINEFELTER
Attached (hand delivered) is the above report for the Klinefelter Short Plat. The short plat is
located on the east side of Meadow Av N near N 40th St. This report is for your files. Thank
you.
cc: Neil W.
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STORM DRAINAGE REPORT
PROPOSED SHORT PLAT
KLINEFELTER SHORT PLAT
SECTION 32 , T. 24 N, R. 5 E. W.M.
RENTON, WASHINGTON 98055
JOB NO. 763-001-981
Prepared by
Touma Engineers
6632 S . 191ST Pl
Suite E-102
Seattle Wa. 98188
PH. 206-251-0665
1
G`�YC of-WA
I . PROJECT OVERVIEW
This project involves about 19, 304 square feet of plat and about
536 square feet of R/W dedication. The site is situated in the
southeast quarter of the northwest quarter of Section 32,
Township 24 North, Range 5 East W. M. This proposal is for the
creation of a 4 lot "Fill In" short plat subdivision on this
property. The streets are to have 16' of paving, curb and
gutter, with 5' sidewalks placed along the frontage. The proposed
plat lies east of Meadow Ave. N. , between N 38th St and N. 40th
St, and adjacent to the west margin of State Highway 1-405 .
The existing site was cleared some years ago for an existing
house for yard and pasture . We note that the site is presently
vegetated with a few fruit trees with grass and brush for ground
cover. The King County Soil Survey notes the soils on the site
are composed of Indianola, ( InC) and Ragnar, (RdE) sandy loams.
(see attached map) These soils are type 1 soils generally
suitable for storm drainage infiltration systems . The soil is
characterized by the following;
• Permeability is moderately rapid
• Runoff is medium
• Erosion hazard is moderate
The site slopes are relatively flat sloping down slightly to the
northwest to the shoulder and shallow roadside swales along
Meadow Ave. The easterly margin of the property slopes sharply
down to I-405 due to the excavation for said highway
II . PRELIMINARY CONDITIONS SUMMARY
CORE REQUIREMENTS 1-5
CORE REQUIREMENT 41 : DISCHARGE AT NATURAL LOCATION
The allowable outflows from the site will be discharged to there
natural locations and not rerouted to other drainage basins .
CORE REQUIREMENT #2 : OFF-SITE ANALYSIS
A level one downstream analysis is a portion of this report . See
the analysis later in this report below.
Pg. - 1
CORE REQUIREMENT #3 : RUNOFF CONTROL
The increased peak runoff, due to any change in pervious
conditions and increase of impervious areas, will be attenuated
using infiltration systems. The houses will direct all their
runoff to infiltration trenches. Any remaining impervious
surfacing will be less than 5000 square feet and thus exempt from
any further detention or peak runoff controls .
CORE REQUIREMENT #4 : CONVEYANCE SYSTEM
The conveyance system will be designed using the rational method.
The drainage system will be designed to the City of Renton
standards and specifications .
CORE REQUIREMENT #5 : EROSION/SEDIMENTATION CONTROL PLAN
The erosion control plan will be designed using the King County
Surface Water Design Manual .
SPECIAL REQUIREMENTS : THOSE APPLICABLE TO PROJECT
1 . Critical Drainage Area - N/A
2 . Compliance with existing Master Drainage Plan - N/A
3 . Conditions Requiring Master Drainage Plan - N/A
4 . Adopted Basin or Community Plans - N/A
5 . Special Water Quality Controls - N/A
6. Coalescing Plate Oil/Water Separators - N/A
7 . Closed Depressions - N/A
8 . Use of Lakes, Wetlands, or Depressions for Detention - N/A
9. Delineation of 100 Year Flood Plain - N/A
10. Flood Protection for Type 1 and 2 Streams - N/A
11 . Geotechnical Analysis and Report - N/A
12 . Soils Analysis and Report - N/A
Pg. - 2
III . OFF-SITE .ANALYSIS
CORE REQUIREMENT #2 : OFF-SITE ANALYSIS
LEVEL 1 ANALYSIS
A: UPSTREAM ANALYSIS
This proposed short plat does not have any significant or
concentrated runoff entering from adjacent or offsite properties.
Note the accompanying offsite topo map which illustrates the
surrounding topography information.
B: DOWNSTREAM ANALYSIS
The surface drainage from the site flows in a northerly and
northwesterly direction. We did not note any concentrated flows
entering or leaving the subject property. The drainage from the
upstream basins and the site sheet flows across the site and
continues northwesterly. The existing conveyance system along
Meadow Ave N. consists of roadside ditches on the east and west
margins of the road. Any surface flows from adjacent properties
will follow these ditches to the north then west along N. 40th
street .
Thence runoff flows westerly along N. 40th street in roadside
ditches. There does not appear to be any substantial flow as the
ditches are small with grass lining, and with no signs of erosion
or washing. The conveyance to Lake Washington Blvd. is primarily
ditches with 12" driveway culverts .
The City of Renton is in the design and contract stages for
installation of a piped conveyance system along Meadow Ave. N.
and N. 40th Street . Any private road improvements that create
runoff will be connected to this new proposed public system.
Pg . - 3
IV. RETENTION/DETENTION ANALYSIS AND DESIGN
The soils on the property consist primarily of Indianola, InC.
These are delineated as type 1 soils in the K.C. S.W.D.M. , which
are well suited for infiltration systems . We anticipate the
design and installation of roof downspout infiltation trenches
for each of the four new houses on these lots. The drainage from
the new private driveway will be less than 2400 square feet and
thus is exempt from peak rate runoff controls, per page 1 . 2 . 3-5
of the K.C. S.W.D.M.
Pg. - 4
Page 1 of 2
King County Building and Land Development Division
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
PART i - • • • •ir:m LoCATION
PROJECT
•
.ProjectOwner Jam�s—J/-Lii EF_Clr _ Project Name LJ-iNE FIFt-Tr2 5N 47- Pktr _
Address Location
���i�'DSG�__.`_:��-�' ^z 7L��_� Township__�
Phone y�
Range ---
ProjectEngineer 1,101A Section
Company .._T.__Ut-!tn11..____G.M_G.irci � �-.- Project Size .....i.qr.��?1_ �— AC • y`�
Addre�s Phone Jo(r3._ __`.i.19 !_S'P� q r? L.vL Upstream Drainage Basin Size _ _AC D,Sk
• • •
oil
[ J Subdivision [XOF/G I IPA [_] Shoreline Management
( Short Subdivision C) COE 404 FJ Rockery
El Grading )_l DOE
Safety [� Structural Vaults
[� Commercial LD FEMA Floodplain U Other
[=_J Other ------_-----..._____—_--__---_-__-- L_) COE Wetlands
CD HPA
PAnT 5 Sift COMMUNITYAND bFIAINAGP.
Community
Drainage Basin
River - LJ Floodplain ------—
E::J Stream
Wetlands ---
0 Critical Stream Reach C) Seeps/Springs
O Depressions/Swales [_—] High Groundwater Table
U Lake ___.—__—.__—-- ------- [ Groundwater Recharge
E--J Steep Slopes -- -- ---- r-) Other - --- -- —
�� Lakeside/Erosion Hazard
Soil Type Slopes Erosion Potential Erosive Velocities
--
CJ Additional Sheets Attatched
Page 2 of 2
King County Building and Land Development Division
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
PANT a bMI-0131VIP-NT LIMItATIONS
REFERENCE LIMITATION/SITE CONSTRAINT
Ch.4-Downstream Analysis__
-------------------
Additional Sheets Attatched
PANT 9 ESC AP-OUIRMENTS
MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS
DURING CONSTRUCTION FOLLOWING CONSTRUCTION
Sedimentation Facilities Stabilize Exposed Surface
I$I Stabilized Construction Entrance Remove and Restore Temporary ESC Facilities
Cl Perimeter Runoff Control Clean and Remove All Silt and Debris
Clearing and Grading Restrictions I-A Ensure Operation of Permanent Facilities
Cover Practices 1--J Flag Limits of NGPES
Construction Sequence LJ Other
Cl Other
PART 10 SUAFACP- WATEA SYS'tP-M
I Grass Lined Channel I--- Tank ICJ Infiltration Method of Analysis
Pipe System Vault Depression
Open Channel I J Energy Dissapalor Flow Dispersal Compensation/Mitigation
I--_- Dry Pond Welland Waiver ofEliml nated Site Storage
Wet Pond Stream Regional Detention
Brief Description of System Operation --,I P -r—e� j
]),J?Au CW Ay 1Zu_t Qrl�� -3- -:--D R -i
Facility Related Silo Limitations
Limitation
Reference Facility J Additional Sheets Attatchad
PANT 111 STRUCTUNAL ANALYSIS PAW12 15ASEMENTSIRAM
(May tequire spatial stfuctufal teview) Drainage Easement
Cast in Place Vault Other Access Easement
Retaining Wall Native Growth Protection Easement
Rockery>4'High Tract
Structural on Steep Slope Other
PANT 114 SIGNAtUht OP 13110PP-9910NAL MGINM
1 or�acivil engineer under my supervision have visited the site. Actual
site conditions as observed were Incorporated into this worksheet and the
attAtchments. To the best of my knowledge the information provided
here Is accurate.
1/90
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