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Home My WebLink AboutTechnical Information Report.pdf Kiwanis Park Improvements Technical Information Report Prepared for: City of Renton Parks, Planning, and Natural Resources 1055 S. Grady Way Renton, WA 98057 Contact: Alan J. Wyatt Phone: (425) 430-6600 Prepared through: Bruce Dees & Associates 222 East 26th Street, Suite 202 Tacoma, WA Contact: Bruce Dees, FASLA Phone: (253) 627-7947 Prepared by: Sitts & Hill Engineers, Inc. 4815 Center Street Tacoma, Washington 98409 Contact: Don Davis, P.E. Phone: (253) 474-9449 September 2021 Revised January 2022 S&H Job Number 18,551 DEVELOPMENT ENGINEERING jchavez 03/17/2022 Kiwanis Park Improvements Technical Information Report Prepared for: City of Renton Parks, Planning, and Natural Resources 1055 S. Grady Way Renton, WA 98057 Contact: Alan J. Wyatt Phone: (425) 430-6600 Prepared through: Bruce Dees & Associates 222 East 26th Street, Suite 202 Tacoma, WA Contact: Bruce Dees, FASLA Phone: (253) 627-7947 Prepared by: Sitts & Hill Engineers, Inc. 4815 Center Street Tacoma, Washington 98409 Contact: Don Davis, P.E. Phone: (253) 474-9449 September 2021 Revised January 2022 S&H Job Number 18,551 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON Project Engineer’s Certification I hereby state that this Technical Information Report for the improvements associated with the Kiwanis Park Improvements project located in Renton, Washington has been prepared by me or under my supervision and meets the minimum standards of the City of Renton and standards of engineering practice. I understand that the City of Renton does not and will not assume liability for the sufficiency, suitability, or performance of drainage facilities prepared by me. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON i Contents 1.0 PROJECT OVERVIEW ........................................................................................................................................ 1 1.1 Scope ................................................................................................................................................................ 1 1.2 Existing Conditions ........................................................................................................................................ 1 1.3 Proposed Conditions ..................................................................................................................................... 1 2.0 PROJECT CONDITIONS AND REQUIREMENTS SUMMARY ..................................................................... 6 2.1 Discussion of Core and Special Requirements .......................................................................................... 6 2.1.1 Core Requirement #1: Discharge at the Natural Location .............................................................. 7 2.1.2 Core Requirement #2: Offsite Analysis ............................................................................................... 7 2.1.3 Core Requirement #3: Flow Control Facilities ................................................................................... 7 2.1.4 Core Requirement #4: Conveyance System ....................................................................................... 7 2.1.5 Core Requirement #5: Construction Stormwater Pollution Prevention ....................................... 7 2.1.6 Core Requirement #6: Maintenance and Operations ....................................................................... 7 2.1.7 Core Requirement #7: Financial Guarantees and Liability ............................................................... 7 2.1.8 Core Requirement #8: Water Quality Facilities ................................................................................. 7 2.1.9 Core Requirement #9: Onsite BMPs .................................................................................................... 8 2.1.10 Special Requirement #1: Other Adopted Area-Specific Requirements ...................................... 8 2.1.11 Special Requirement #2: Flood Hazard Area Delineation ............................................................. 8 2.1.12 Special Requirement #3: Flood Protection Facilities ..................................................................... 8 2.1.13 Special Requirement #4: Source Controls ........................................................................................ 8 2.1.14 Special Requirement #5: Oil Control ................................................................................................. 8 2.1.15 Special Requirement #6: Aquifer Protection Area ......................................................................... 8 3.0 OFF-SITE ANALYSIS ....................................................................................................................................... 15 3.1 Study Area Definition and Map ................................................................................................................ 15 3.2 Resource Review ......................................................................................................................................... 15 3.3 Field Inspection ........................................................................................................................................... 15 3.4 Drainage System Problem Descriptions ................................................................................................. 15 3.5 Mitigation of Existing or Potential Problems ........................................................................................ 15 4.0 FLOW CONTROL, LID, AND WATER QUALITY FACILITY ANALYSIS AND DESIGN ........................ 17 4.1 Flow Control ................................................................................................................................................ 17 4.2 Low Impact Development (LID) ................................................................................................................ 18 4.3 Water Quality .............................................................................................................................................. 19 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN ................................................................................... 23 6.0 SPECIAL REPORTS AND STUDIES............................................................................................................... 30 7.0 OTHER PERMITS ............................................................................................................................................. 30 8.0 CSWPPP ANALYSIS AND DESIGN ............................................................................................................... 30 9.0 BOND QUANTITIES, Facility Summaries, and Declaration of Covenant .......................................... 30 10.0 OPERATIONS AND MAINTENANCE MANUAL ....................................................................................... 31 10.1 Purpose ...................................................................................................................................................... 31 10.2 Permanent Facilities Description ........................................................................................................... 31 10.3 Discussion of Maintenance ..................................................................................................................... 31 10.4 Maintenance Frequency .......................................................................................................................... 31 10.5 Annual Cost Estimate ............................................................................................................................... 32 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON ii APPENDICES A.1 TIR Worksheet A.2 City Correspondence A.3 WWHM Reports KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 1 1.0 PROJECT OVERVIEW 1.1 Scope This Technical Information Report addresses the Kiwanis Park Improvements project located at 815 Union Avenue NE in Renton, Washington 98056. The project parcel numbers are 0923059192 (7.523 acres), 0923059015 (0.620 acres), 0425200231 (0.480 acres), 0923059227 (0.389 acres), and a portion of 0421000680 (0.238 acres); they combine for a total of 9.25 acres. Please note that the parcel areas identified herein are per the project survey and vary from the square footages noted on public GIS. Please see Figure 1 for a Vicinity Map of the project area. The project area (9.25 acres) is currently comprised of a multi-purpose building, a playfield (partially under-drained), a playground area, lawn areas, a paved tennis court, a paved basketball court, paved walkways, and a paved parking lot. This re-development project proposes to modernize facilities and improve community access to the park. Improvements to the existing park include a new synthetic turf infield; a multi-use, under-drained playfield (grass); a restroom replacement; a new playground/woodchip area; a covered picnic area; a resurfaced basketball court; a re-surfaced parking lot; and upgraded pedestrian paved pathways. There are portions of the site for which no upgrades are proposed, including the existing tennis court area and westerly pedestrian access pathways – both of which are in good condition. This Technical Information Report (TIR) has been prepared in accordance with the City of Renton Surface Water Design Manual (the Manual); dated December 12, 2016. A copy of the TIR Worksheet, which provides basic information about the scope of this project, is included with this report in Appendix A.1. 1.2 Existing Conditions The existing project area is comprised of pervious and impervious surface areas, as categorized in Table 1 and depicted in Figure 2. Runoff from the site is collected and conveyed in a piped network that directs stormwater runoff to the City’s Union Avenue conveyance system. Based upon our conversations with maintenance staff, we are not aware of any capacity problems with the existing drainage facilities serving the project area. However, issues such as high groundwater, pavement failure (potholing and alligator cracking), and poorly infiltrating soils result in standing water on portions of the site. For onsite soils information, please see the geotechnical report, prepared by Migizi Group – included with this submittal under separate cover. 1.3 Proposed Conditions The proposed project area is comprised of pervious and impervious surface areas, as categorized in Table 1 and depicted in Figure 3. Stormwater runoff from the site will be collected and conveyed to a piped network, detained where necessary, then directed to the City’s Union Avenue conveyance system. A flow control structure will work together with the available detention volume – within the new field underdrain system – to provide flow control. A new water quality filter (Oldcastle Biopod) will be installed to provide water quality treatment for the site parking lot. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 2 Table 1- Surface Coverage Tabulation Surface Area (sf) Area (ac) Surface Area (sf) Area (ac) Existing Landscape/Vegetation 315,755 7.25 Woodchip Play Area 9,918 0.23 Pervious 325,673 7.48 Building 1,450 0.03 Pavement 75,753 1.74 Impervious 77,203 1.77 Total 402,876 9.25 Total 402,876 9.25 Proposed Landscape/Vegetation (To Remain) 277,915 6.38 Landscape/Vegetation (New) 14,981 0.34 Woodchip Play Area (Replaced) 9,890 0.23 Pervious 302,786 6.95 Synthetic Turf (New) 8,140 0.19 Pavement (To Remain) 21,214 0.49 Pavement (Maintenance) 13,355 0.31 Pavement (Maintenance)* 26,833 0.62 Pavement (New) 30,548 0.70 Impervious 100,090 2.30 Total 402,876 9.25 Total 402,876 9.25 * denotes pollution generating surface Proposed New Impervious Surfaces 38,688 0.888 Removed Impervious to Vegetation 14,981 0.344 Targeted Net Impervious 23,707 0.544 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 3 Figure 1 – Site Location Map KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 4 Figure 2 - Existing Surface Coverage KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 5 Figure 3 - Proposed Surface Coverage KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 6 2.0 PROJECT CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Discussion of Core and Special Requirements This project is considered a re-development and maintenance project, as it will repair, add, replace, or modify impervious and pervious surfaces on a site that is already substantially developed. The project site is more than 7,000 square feet (sf) and proposes to replace more than 5,000 sf of impervious area. Therefore, a Full Drainage review is required per Figure 1.1.2.A of the Manual. The project is subject to a full drainage review and must address all core requirements (1-9) and all special requirements (1-6) of the Manual. See Figures 4 and 5 at the end of this Section. The design team and City coordinated to define the target surfaces during the pre-application process. This correspondence is included in Appendix A.3. Below is a summary of several of the most significant surface coverages and logic regarding their impervious/pervious designation, as coordinated with the City: Re-surfaced (paved) parking lot: The proposed improvements in the southwest parking lot do not change the functioning characteristics or size of the parking facility. An asphalt grind and overlay with an intermediate geotextile fabric layer will not constitute removal of the existing surface to the subgrade, thus the proposed re-surfacing is considered maintenance. Due to this parking lot’s status as a pollution generating surface, the City has encouraged that runoff from this surface be treated prior to discharge. Therefore, we propose to treat the parking area with an Oldcastle Infrastructure Biopod biofiltration vault. Re-surfaced (paved) pathways and basketball court: Areas where the existing impervious surface is re-surfaced are considered maintenance and not subject to water quality (none of these surfaces are subject to vehicular traffic, and therefore considered non-pollution generating), nor flow control requirements. Under-drained Synthetic Infield: This area is considered new impervious surface and is targeted for flow control. The synthetic infield surface will be infilled with encapsulated styrene butadiene rubber (SBR). The encapsulation process reduces VOC and heavy metal runoff of the ambient rubber. The synthetic playfield will not be subject to vehicular traffic. Therefore, we consider the synthetic turf infield to be a non-pollution generating surface, and are not proposing water quality measures. Under-drained Grass Playfield: The proposed playfield areas will be surfaced with grass and serviced with an under-drain system. Under existing conditions, stormwater from the existing grass-surfaced ball-field areas drain to the existing underdrain system. Therefore, the runoff characteristics do not change between the pre-developed and the developed condition. Based on coordination with City staff, the area within the improved under-drained ball-field is considered as replaced pervious surface and not subject to flow control. The natural turf playfield will not be subject to the use of traditional pesticides or fertilizers, but rather be treated with organic fertilizer. Also, the grass playfield will be flat and underdrained, and is not expected to be subject to soil loss. Therefore, we consider the grass playfield to be a non-pollution generating surface, and are not proposing water quality measures. Other surface coverages are more typical to site re-development and explained and discussed further herein. Please reference Table 1 and Figures 2 and 3. Included hereafter is a description of each core requirement and how the project proposes to satisfy each requirement. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 7 2.1.1 Core Requirement #1: Discharge at the Natural Location In the existing condition, the project site discharges to the City’s conveyance (pipe network) system in Union Avenue. Under proposed conditions, the project will continue to discharge to the same offsite conveyance system. 2.1.2 Core Requirement #2: Offsite Analysis The Off-Site Analysis included in Section 3.0 of this TIR will satisfy this Core Requirement. 2.1.3 Core Requirement #3: Flow Control Facilities The project is located within a Flow Control Duration Standard Area and is required to provide an onsite flow control. Please reference the surface coverages identified on Figures 2 and 3 and Table 1. The Flow Control Target Surfaces are new and replaced impervious surfaces (surface maintenance is not included in either of these targeted areas). As coordinated with City staff and due to the removal and consolidation of impervious areas under the proposed conditions, the new landscape/vegetation area has been subtracted from the total new targeted impervious surfaces. 2.1.4 Core Requirement #4: Conveyance System The under-drains beneath the field, together with the improved site conveyance system will serve to satisfy this requirement. See Section 5 of this report for a detailed description of the conveyance system design. 2.1.5 Core Requirement #5: Construction Stormwater Pollution Prevention A temporary Erosion and Sediment Control Plan (TESC) has been prepared and included in the plan set. Additionally, a CSWPPP report has been prepared and bound under a separate cover to satisfy this requirement. 2.1.6 Core Requirement #6: Maintenance and Operations Please see Section 10.0 of this TIR for the Operations and Maintenance Manual, prepared to satisfy this Core Requirement. The City of Renton will be responsible for maintenance and operation of the on-site stormwater facilities upon completion of construction. 2.1.7 Core Requirement #7: Financial Guarantees and Liability The project owner is the City of Renton. Therefore, no financial guarantees will be required. 2.1.8 Core Requirement #8: Water Quality Facilities The project proposes to install a water quality facility to treat stormwater runoff from the parking lot, which is comprised of 0.616 acres of impervious pollution generating surface, and the only pollution generating surface within the park. Based on coordination with City staff, a water quality device is not required, though it is recommended. The design team agrees that incorporation of a water quality device will work to substantively improve the quality of stormwater runoff leaving the site. Calculations have been included in Section 4 of this report to demonstrate basic treatment of stormwater runoff generated by the parking lot. We do not consider any of the pervious surfaces within the park to be pollution generating surfaces. Therefore, no additional water quality measures are proposed. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 8 2.1.9 Core Requirement #9: Onsite BMPs The project is required to provide on-site BMPs to mitigate the impacts of storm and surface water runoff generated by targeted new impervious, new pervious, and replaced impervious surfaces. The project will satisfy this minimum requirement by application of BMPs to the maximum extent feasible using lists specific to the project location, size, and impervious coverage. Please see Section 4 for a detailed evaluation of the applicable Onsite BMPs. 2.1.10 Special Requirement #1: Other Adopted Area-Specific Requirements To our knowledge, the project site is not in a designated critical drainage area or in an area included in an adopted master drainage plan, basin plan, salmon conservation plan, stormwater compliance plan, flood hazard management plan, lake management plan, or shared facility drainage plan. The City’s Critical Area Map (Figure 8) does not indicate the presence of critical areas on the site. 2.1.11 Special Requirement #2: Flood Hazard Area Delineation Per the FEMA floodplain map at the end of this Section (Figure 6), the project site lies within Zone X, which is defined as “an area of minimal flood hazard”. Delineation of a hazard area is not applicable. 2.1.12 Special Requirement #3: Flood Protection Facilities This project does not propose to rely on an existing flood protection facility nor does it modify or construct a new flood protection facility. 2.1.13 Special Requirement #4: Source Controls The City of Renton shall maintain the stormwater drainage system as described in the Operations and Maintenance Manual, included in Section 10.0 of this report. No other source control BMPs are applicable to this site because pollution-generating activities, such as those listed in Section 1.3.4 of the Manual, will not occur on the project site. 2.1.14 Special Requirement #5: Oil Control This project is not considered high-use; therefore, this Special Requirement is not applicable. 2.1.15 Special Requirement #6: Aquifer Protection Area The site is not within an Aquifer Protection Area, please see Figure 7 of this Report. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 9 Figure 4 – Flow Chart for Determining Type of Drainage Review Required KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 10 Figure 5 – Requirements Applied Under Each Drainage Review Type KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 11 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 12 Figure 6 – FEMA Map KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 13 Figure 7 - Aquifer Protection Areas KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 14 Figure 8 - Critical Areas Map KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 15 3.0 OFF-SITE ANALYSIS Per Section 1.2.2 of the Manual, this project must provide an off-site analysis that assesses potential off- site drainage and water quality impacts associated with the proposed project. The level of analysis required depends on the specific site and downstream conditions. In accordance with Section 1.2.2.1, we have performed a Level 1 Downstream Analysis. 3.1 Study Area Definition and Map The study area extends downstream for one mile, as depicted on Figure 9. In addition to the one-mile downstream flow path, this figure depicts property lines, topographic information, City conveyance lines, and critical areas per City GIS. The downstream flow path study area is comprised of man-made and natural conveyances. 3.2 Resource Review A thorough review of the resources has been completed for the study area. No adopted basin plans have been found for the study area. According to the FEMA Map presented in Figure 6 of this report, the project site lies within Zone X, which is defined as “areas of minimal flood hazard.” We are not aware of any other available offsite analysis reports for the site subbasin. Based on the critical areas listed on City GIS, the site flows into Maplewood Creek and a GIS-identified wetland area approximately 3,200 feet south of the site. According to King County iMap, there is one drainage complaint near the downstream flowpath with 1 mile of the project site. The complaint was for water under a home at 375 Union Ave SE #198. This complaint was closed on March 31, 2016. We are not aware of a migrating river study, a 303d listing, or an adopted stormwater compliance plan that apply to the downstream drainage path within 1 mile of the project site. A geotechnical report has been prepared by Migizi Group (dated March 12, 2020) for the proposed project and is included with this permit submittal under a separate cover. 3.3 Field Inspection The condition of the existing onsite storm system has been monitored by park maintenance staff. The existing fields are regularly wet during the winter months and do not drain well. This is due to a combination of poorly infiltrating native soils and a failing existing underdrain system. Further, stormwater pools in low points along pathways throughout the site, as the existing system has limited inlets and the soils do not infiltrate well. Existing closed conveyance piping (non-perforated) appears to be in good working condition once water enters the system. No problems were found related to constrictions, capacity deficiencies, flooding, scouring, overtopping hazards, sedimentation, or erosion. 3.4 Drainage System Problem Descriptions During the site visit, standing water was observed throughout the field and at various low points throughout the site. The depth was minimal, though lawn areas were generally soggy. The site soils drain poorly. 3.5 Mitigation of Existing or Potential Problems The proposed upgrades, which include a new under-drained playfield as well as upgraded pavements, pathways and conveyances, will resolve these existing drainage problems. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 16 Figure 9 – Downstream Flowpath KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 17 4.0 FLOW CONTROL, LID, AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 4.1 Flow Control The project will provide flow control for New Impervious Areas, per the Manual requirements. The targeted net impervious surface is 0.544 CFS, as shown in Table 1. Based on modeling using the Western Washington Hydrology Model (WWHM), a storage volume of 0.262 ac-ft (11,413 cu-ft) is required together with a control structure that will meter runoff from the site to the offsite conveyance system. A summary of the WWHM input and output results are included in this section, while the complete WWHM Report is included in Appendix A.3. Pre-Developed WWHM Input Mitigated (Developed) WWHM Input Underdrain System Storage – Required Volume (0.262 ac-ft, 11,413 CF) KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 18 Stormwater flow control will be provided at the proposed multi-purpose field. A control system is located near the northeast extent of the field, and storage is comprised of the void volume of the field underdrain collection system, and a 4” course of base rock beneath the entire field. Pea gravel and coarse base aggregate are used for these features, respectively, and provide a void ratio of approximately 0.4. A Civil3D surface model was created to calculate the total volume of the underdrain trenches and drainage course, yielding a total storage volume of 1,200 CY (32,400 CF). Applying the 0.4 void ratio to this volume yields a total storage volume of 12,960 CF, which is greater than the 11,413 CF required in the WWHM model. 4.2 Low Impact Development (LID) Low Impact Development feasibility was evaluated by application of BMPs to the maximum extent feasible using lists specific to the project location, size, and impervious coverage. Target surfaces are new impervious surfaces, new pervious surfaces, and replaced impervious surfaces, not already mitigated with an approved onsite BMP or flow control facility. All grass and landscaped (pervious) surfaces will be restored in accordance with the soil amendment BMP, as detailed in the Manual, Appendix C, Section C.2.13. Per the Manual, target impervious surfaces must implement Full Infiltration, Basic Dispersion, and/or Perforated Pipe Connections for roofs, if feasible. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 19 Full Infiltration has been deemed infeasible per Appendix C.2.2 Infeasibility Criteria; the site-specific geotechnical evaluation indicates filtration through the native soils is not feasible or recommended. The site is comprised of a stiff, mottled glacial silt underlain by glacial till soils. Basic Dispersion is not feasible due to the existing soil characteristics (hard pan) and existing flooding/ponding issues at the park. The French drain system proposed along the walkways will minimize flooding/ponding issues and provide a small amount of infiltration via the perforated pipes. Perforated Pipe Connections are not applicable to the project. While a Portland Loo is proposed, it does not have a substantive surface area (essentially a sturdy / plumbed ‘Honeybucket’), nor does it have roof drain downspouts. The Manual further states that the project must demonstrate compliance with the LID Performance Standard by either 1) demonstrating the LID Performance Standard using a continuous runoff model or by 2) demonstrating compliance by implementing LID Performance Standard to the maximum extent feasible as described in Section 1.2.9.2.2. Large Lot BMP Requirements apply, as the site is larger than 22,000 square feet. This Section of the Manual requires the project to initially review the potential for Full Dispersion and Full Infiltration of Roof Runoff. Full Dispersion per Appendix C.2.1 requires impervious surfaces to be dispersed over a native vegetated flow path. A native vegetated surface is defined by the Manual as a surface in which the soil conditions, ground cover, and species of vegetation are like those of the original native condition for the site. The site has been previously developed as a park; therefore, this requirement cannot be met. Further, for the continued use of the site as a park, the project cannot be planted in a manner to fully satisfy the requirement for a surface to be converted to a native vegetated surface. Limited Infiltration per Appendix C.2.3 requires a geotechnical report identifying the soils as fine sands, loamy sands, sandy loams, or loams. The site does not contain soils suited to limited infiltration. Bioretention is not feasible based on the Manual’s infeasibility criteria listed in Appendix C.2.6, numbers 19, 20, and 21. Per the Geotechnical report, there is high groundwater and the infiltration is not feasible (<0.30 inches per hour). Permeable Pavement is not feasible based on the Manual’s infeasibility criteria listed in Appendix C.2.7. High groundwater conditions would create saturated conditions in the vicinity of the pavement areas and (#24), infiltration is not feasible (<0.30 inches per hour). Basic Dispersion is not feasible due to the existing soil characteristics (hard pan) and existing flooding/ponding issues at the park. The French drain system proposed along the walkways will minimize flooding/ponding issues and provide a small amount of infiltration via the perforated pipes. 4.3 Water Quality The project proposes to install an Oldcastle Infrastructure BioPod biofilter vault to provide enhanced treatment for the stormwater runoff from the parking lot area. Please note that water quality requirements are not required (reference City correspondence in Appendix A.2). However, in an effort to further improve the Park, the project proposes to install this water quality feature. The BioPod unit was sized in accordance with DOE’s General Use Level Designation (GULD) Guidance. The tributary parking lot area is 0.616 acres and the resulting water quality flow is 0.0565 cfs = 25.35 gpm (off-line for internal bypass unit capability). Model BPU-46IB has the ability to treat up to 25.6 gpm; therefore it will provide enhanced treatment in accordance with the GULD guidance. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 20 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 21 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 22 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 23 5.0 CONVEYANCE SYSTEM ANALYSIS AND DESIGN New 4” under-drains at 0.50% min (0.07 acres max tributary area) will be positioned beneath the new field and will be routed to a closed conveyance system via an 8” leader at 0.7% min. (1.72 acres max tributary area) that will convey the cumulative under-drained runoff from the field. The calculation provided in this section demonstrates that the new under-drains will adequately convey runoff. C PR TC aR bR iR IR A Q in min in/hr ac cfs 0.25 3.4 6.3 2.66 0.65 0.804 2.734 0.07 0.048 0.25 3.4 6.3 2.66 0.65 0.804 2.734 1.72 1.178 4” Underdrain Capacity Pipe Diameter D 4.0 (inches) Manning's "n" n 0.013 Slope S 0.50 (%)Formulas: Flow Depth d 4.00 (inches) Flow Depth Ratio d/D 1.00 (%) d/D = (d/D) Flow Point Angle q 360 (deg)q = 2*COS-1((1-(2*d/D)) Flow Area A 0.087 (ft2)A = 1/8*(RADIANS(qr)-SIN(qr))*(D/12)2 Wetted Perimeter WP 1.047 (ft) WP = p*(D/12)*qr/(2*p) Hydraulic Radius R 0.083 (ft) R = A/WP Flow Q 0.135 (cfs)Q = (1.49/n)*A*R2/3*S0.5 Velocity V 1.546 (fps)V = Q/A 8” Underdrain Collector (at 0.7%) Capacity Pipe Diameter D 8.0 (inches) Manning's "n" n 0.012 Slope S 0.70 (%)Formulas: Flow Depth d 7.45 (inches) Flow Depth Ratio d/D 0.93 (%) d/D = (d/D) Flow Point Angle q 299.2 (deg)q = 2*COS-1((1-(2*d/D)) Flow Area A 0.339 (ft2)A = 1/8*(RADIANS(qr)-SIN(qr))*(D/12)2 Wetted Perimeter WP 1.741 (ft)WP = p*(D/12)*qr/(2*p) Hydraulic Radius R 0.195 (ft) R = A/WP Flow Q 1.181 (cfs)Q = (1.49/n)*A*R2/3*S0.5 Velocity V 3.488 (fps)V = Q/A KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 24 8” Conveyance System Capacity Pipe Diameter D 8.0 (inches) Manning's "n" n 0.012 Slope S 1.00 (%)Formulas: Flow Depth d 7.45 (inches) Flow Depth Ratio d/D 0.93 (%) d/D = (d/D) Flow Point Angle q 299.2 (deg)q = 2*COS-1((1-(2*d/D)) Flow Area A 0.339 (ft2)A = 1/8*(RADIANS(qr)-SIN(qr))*(D/12)2 Wetted Perimeter WP 1.741 (ft)WP = p*(D/12)*qr/(2*p) Hydraulic Radius R 0.195 (ft) R = A/WP Flow Q 1.412 (cfs)Q = (1.49/n)*A*R2/3*S0.5 Velocity V 4.169 (fps)V = Q/A 12” Conveyance System Capacity Pipe Diameter D 12.0 (inches) Manning's "n" n 0.012 Slope S 0.50 (%)Formulas: Flow Depth d 11.30 (inches) Flow Depth Ratio d/D 0.94 (%) d/D = (d/D) Flow Point Angle q 304.1 (deg)q = 2*COS-1((1-(2*d/D)) Flow Area A 0.767 (ft2)A = 1/8*(RADIANS(qr)-SIN(qr))*(D/12)2 Wetted Perimeter WP 2.654 (ft)WP = p*(D/12)*qr/(2*p) Hydraulic Radius R 0.289 (ft) R = A/WP Flow Q 2.943 (cfs)Q = (1.49/n)*A*R2/3*S0.5 Velocity V 3.838 (fps) V = Q/A 15” Conveyance System Capacity Backwater calculations were also performed for the proposed conveyance system network to confirm capacity during 25-year storm events. Features intended for capture and conveyance of stormwater, such as the perforated drains were included in the calculations. Their capped ends were treated as structures with a rim elevation equal to the proposed surface to simplify calculations. The only location that sees ponding is the collector trench on the east side of the park at the Union Ave entrance. This is due to the simplification mentioned earlier, where the calculations treated the collection trench as a Pipe Diameter D 15.0 (inches) Manning's "n" n 0.013 Slope S 0.54 (%)Formulas: Flow Depth d 14.07 (inches) Flow Depth Ratio d/D 0.94 (%) d/D = (d/D) Flow Point Angle q 302.413219 (deg)q = 2*COS-1((1-(2*d/D)) Flow Area A 1.1957638 (ft2)A = 1/8*(RADIANS(qr)-SIN(qr))*(D/12)2 Wetted Perimeter WP 3.29881648 (ft) WP = p*(D/12)*qr/(2*p) Hydraulic Radius R 0.36248267 (ft) R = A/WP Flow Q 5.120 (cfs)Q = (1.49/n)*A*R2/3*S0.5 Velocity V 4.28184846 (fps)V = Q/A KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 25 single, structure with no storage capacity. There will be no ponding at this location during a 25-year storm event. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 26 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 27 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 28 Backwater Analysis (1)Q (cfs)(2)Length (ft)(3)Pipe Size (ft)(4)Manning's 'n' Value(5)Outlet Elev (ft)(6)Inlet Elev (ft)(7)Barrel Area (sqft)(8)Barrel Vel (fps)(9)Barrel Vel Head (ft)(10)TW Elev (ft)(11)Friction Loss (ft)(12)Entrance HGL Elev (ft)(13)Entrance Head Loss (ft)(14)Exit Head Loss (ft)(15)Outlet Control Elev (ft)(16)Inlet Control Elev (ft)(17)Approach Vel Head (ft)(18)Bend Head Loss (ft)(19)Junction Head Loss (ft)(20)Headwater Elev (ft)Rim Elevation (ft)Freeboard (ft)Out CB206 7.36052 46 1.25 0.009 410.46 410.71 1.23 6.00 0.56 411.46 0.28 411.96 0.28 0.56 412.80 413.15 0.66 0.89 0.94 414.32 415.10 0.78CB206 CB205 5.107892 139 1.00 0.009 410.71 413.49 0.79 6.50 0.66 414.32 1.36 415.67 0.33 0.66 416.66 415.97 0.23 0.02 0.24416.69 420.50 3.81CB205 CB204 3.048442 108 1.00 0.009 413.49 414.03 0.79 3.88 0.23 416.69 0.38 417.06 0.12 0.23 417.41 415.43 0.23 0.04 0.00417.22 423.95 6.73CB204 CB203 3.048442 73 1.00 0.009 414.03 414.40 0.79 3.88 0.23 417.22 0.25 417.47 0.12 0.23 417.82 415.80 0.05 0.06 0.03 417.87 428.50 10.63CB203 CB308 0.603748 17 0.67 0.009 419.23 420.93 0.35 1.73 0.05 417.87 0.02 421.60 0.02 0.05 421.67 421.26 0.05 0.06 0.06 421.74 424.60 2.86CB308 CB305 0.603748 140 0.67 0.009 420.93 421.63 0.35 1.73 0.05 421.74 0.17 422.30 0.02 0.05 422.37 421.99 0.00 0.00 0.00422.37 424.80 2.43CB305 CB304 0.118186 134 0.67 0.009 421.63 421.78 0.35 0.34 0.00 422.37 0.01 422.45 0.00 0.00 422.45 421.91 0.00 0.00 0.00422.45 424.95 2.50CB304 CB303 0.118186 12 0.67 0.009 421.78 421.90 0.35 0.34 0.00 422.45 0.00 422.57 0.00 0.00 422.57 422.02 0.00 0.00 0.00 422.57 425.07 2.50CB303 HP2 0.118186 146 0.67 0.009 421.9 422.63 0.35 0.34 0.00422.57 0.01 423.30 0.00 0.00 423.30 422.76 0.00 0.00 0.00 423.30 425.00 1.70Pipe SegmentCB to CBCB304 CAP11 0.215168 420 0.67 0.009 421.78 425.00 0.35 0.62 0.01 422.45 0.06 425.67 0.00 0.01 425.68 425.18 0.00 0.00 0.00425.68 426.00 0.32CB305 CB306 0.060317 12 0.67 0.009 421.63 421.75 0.35 0.17 0.00 422.37 0.00 422.42 0.00 0.00 422.42 421.83 0.00 0.00 0.00 422.42 424.92 2.50CB306 CAP9 0.060317 98 0.67 0.009 421.75 424.00 0.35 0.17 0.00 422.42 0.00 424.67 0.00 0.00 424.67 424.08 0.00 0.00 0.00 424.67 425.50 0.83CB308 CB307 0.086595 12 0.67 0.009 420.93 421.05 0.35 0.25 0.00 421.74 0.00 421.74 0.00 0.00 421.74 421.15 0.00 0.00 0.00 421.74 424.72 2.98CB307 CAP7 0.086595 88 0.67 0.009 421.05 424.00 0.35 0.25 0.00 421.74 0.00 424.67 0.00 0.00 424.67 424.10 0.00 0.00 0.00 424.67 424.67 0.00CB307 CAP8 0.165933 135 0.67 0.009 421.05 421.75 0.35 0.48 0.00 421.74 0.01 422.42 0.00 0.00 422.42 421.90 0.00 0.00 0.00 422.42 424.92 2.50CB308 CAP6 0.0228 46 0.67 0.009 420.93 424.00 0.35 0.07 0.00 421.74 0.00 424.67 0.00 0.00 424.67 424.03 0.00 0.00 0.00 424.67 424.67 0.00CB203 CB202 0.081844 231 1.00 0.009 414.4 415.56 0.79 0.10 0.00 417.87 0.00 417.87 0.00 0.00 417.87 415.69 0.00 0.00 0.00 417.87 424.90 7.03CB202 CB302 0.081844 12 0.67 0.009 421.03 421.43 0.35 0.23 0.00 417.87 0.00 422.10 0.00 0.00 422.10 421.52 0.00 0.00 0.00 422.10 424.60 2.50CB302 CB301 0.081844 16 0.67 0.009 421.43 421.75 0.35 0.23 0.00 422.10 0.00 422.42 0.00 0.00 422.42 421.85 0.00 0.00 0.00 422.42 424.75 2.33CB301 CAP14 0.081844 243 0.67 0.009 421.75 424.30 0.35 0.23 0.00 422.42 0.01 424.97 0.00 0.00 424.97 424.40 0.00 0.00 0.00424.97 425.75 0.78CB302 CAP13 0.034659 273 0.67 0.009 421.43 425.00 0.35 0.10 0.00 422.10 0.00 425.67 0.00 0.00 425.67 425.06 0.00 0.00 0.00425.67 426.50 0.83CB202 CB201 0.900709 236 1.00 0.009 415.56 417.92 0.79 1.15 0.02 417.87 0.07 418.92 0.01 0.02 418.95 418.40 0.02 0.03 0.01418.97 425.39 6.42CB201 BIOPOD 0.900709 75 1.00 0.009 417.92 418.67 0.79 1.15 0.02 418.97 0.02 419.67 0.01 0.02 419.70 419.15 0.02 0.00 0.00419.68 425.00 5.32BIOPOD CB101 0.900709 112 1.00 0.012 420.32 421.00 0.79 1.150.02 419.68 0.06 422.00 0.01 0.02 422.03 421.48 0.00 0.00 0.00 422.03 423.09 1.06CB201 TRENCH2 1.044548 22 0.67 0.009 421.72 422.99 0.35 2.990.14 418.97 0.08 423.66 0.07 0.14 423.87 423.86 0.00 0.00 0.00 423.87 424.33 0.46CB203 CB401 0.588045 36 1.00 0.009 414.4 420.11 0.79 0.75 0.01 417.87 0.00 421.11 0.00 0.01 421.12 420.41 0.00 0.00 0.00 421.12 428.50 7.38CB205 CROSS1 0.889524 52 0.67 0.009 417.32 420.09 0.35 2.55 0.10 416.69 0.13 420.76 0.05 0.10 420.91 420.57 0.10 0.14 0.00420.94 423.00 2.06CROSS1 HP1 0.889524 181 0.67 0.009 420.09 421.00 0.35 2.55 0.10 420.94 0.46 421.67 0.05 0.10 421.82 421.49 0.00 0.00 0.00 421.82 423.00 1.18 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 29 (1)Q (cfs)(2)Length (ft)(3)Pipe Size (ft)(4)Manning's 'n' Value(5)Outlet Elev (ft)(6)Inlet Elev (ft)(7)Barrel Area (sqft)(8)Barrel Vel (fps)(9)Barrel Vel Head (ft)(10)TW Elev (ft)(11)Friction Loss (ft)(12)Entrance HGL Elev (ft)(13)Entrance Head Loss (ft)(14)Exit Head Loss (ft)(15)Outlet Control Elev (ft)(16)Inlet Control Elev (ft)(17)Approach Vel Head (ft)(18)Bend Head Loss (ft)(19)Junction Head Loss (ft)(20)Headwater Elev (ft)Rim Elevation (ft)Freeboard (ft)Pipe SegmentCB to CBCB206 CB309 0.14555 84 0.67 0.009 411.14 411.98 0.35 0.42 0.00 414.32 0.01 414.32 0.00 0.00 414.33 412.12 0.00 0.00 0.00 414.33 415.75 1.42CB309 TEE2 0.14555 14 0.67 0.009 411.98 414.05 0.35 0.42 0.00414.33 0.00 414.72 0.00 0.00 414.72 414.14 0.00 0.00 0.00 414.72 415.50 0.78TEE2 CAP4 0.14555 31 0.67 0.009 414.05 414.50 0.35 0.42 0.00 414.72 0.00 415.17 0.00 0.00 415.17 414.64 0.00 0.00 0.00 415.17 415.25 0.08TEE2 CAP5 0.676405 231 0.67 0.009 414.05 416.61 0.35 1.94 0.06 414.72 0.34 417.28 0.03 0.06 417.36 417.00 0.00 0.00 0.00 417.36 418.00 0.64CB206 CB310 0.294239 16 0.67 0.009 411.32 411.64 0.35 0.84 0.01 414.32 0.00 414.32 0.01 0.01 414.34 411.85 0.01 0.01 0.01 414.34 415.05 0.71CB310 TEE1 0.294239 14 0.67 0.009 411.64 412.87 0.35 0.84 0.01 414.34 0.00 414.35 0.01 0.01 414.36 413.06 0.01 0.01 0.00 414.37 414.50 0.13TEE1 CAP2 0.294239 141 0.67 0.009 412.87 413.37 0.35 0.84 0.01 414.37 0.04 414.41 0.01 0.01 414.42 413.59 0.00 0.00 0.00 414.42 414.50 0.08CB310 CAP1 0.338344 391 0.67 0.009 411.64 424.30 0.35 0.97 0.01 414.34 0.15 424.97 0.01 0.01 424.99 424.53 0.00 0.00 0.00 424.99 425.00 0.01CB309 CAP15 0.129276 197 0.67 0.009 411.98 422.00 0.35 0.37 0.00 414.33 0.01 422.67 0.00 0.00 422.67 422.12 0.00 0.00 0.00422.67 424.50 1.83CB206 TRENCH1 0.033351 29 0.67 0.009 411.32 411.79 0.35 0.100.00 414.32 0.00 414.32 0.00 0.00 414.32 411.85 0.00 0.00 0.00 414.32 414.12 -0.20 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 30 6.0 SPECIAL REPORTS AND STUDIES A geotechnical report has been prepared by Migizi Group (dated March 12, 2020) for the proposed project and is included with this permit submittal under a separate cover. No other special reports or studies have been prepared for the proposed project. 7.0 OTHER PERMITS In addition to a Site Permit, a Building Permit will be required for the proposed restroom structure (Portland Loo). 8.0 CSWPPP ANALYSIS AND DESIGN See the Construction Stormwater Pollution Prevention Plan report, which has been included with this submittal under separate cover. 9.0 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT N/A. The proposed project does not require bonding since the project owner is the City of Renton. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 31 10.0 OPERATIONS AND MAINTENANCE MANUAL 10.1 Purpose The purpose of this manual is to provide guidelines for maintaining the existing and proposed storm drainage system for Kiwanis Park. The site address is 815 Union Avenue SE, Renton, WA 98056. The storm system consists of field under-drain piping as well as catch basins and other conveyance piping. The storage space within the gravel void space and the perforated under-drain piping serves as the site’s detention system. There is one control structure on the site as well that meters the release of stormwater from the site’s detention system. Each portion of the system has to be maintained in good working condition for the system to function properly. Operations and Maintenance of the drainage systems will be the responsibility of the City of Renton Public Works Maintenance Division located at: 3555 NE 2nd Street Renton, WA 98056 Phone: (425) 430-7400 10.2 Permanent Facilities Description The fields are served by an existing under-drain system that are bedded in a gravel trench. These under- drains tie into the park stormwater conveyance system, which discharges to the conveyance system within Union Avenue NE (which forms the east boundary of the site). 10.3 Discussion of Maintenance Any buildup of sediment, debris, vegetation, or trash that impedes the flow of stormwater may cause problems. As a result, care must be taken to keep catch basins and piping clear of debris. A “vactor” truck, or other approved means, should be used to clean the on-site catch basins. Deposits on paved surfaces should be swept or mechanically removed in order to prevent sediment or debris from entering the drainage system. Sediment removed must be disposed of at an approved site. The applicable maintenance checklists and excerpts from the Renton Surface Water Design Manual have been included with the Operations and Maintenance Manual for review during routine maintenance inspections. 10.4 Maintenance Frequency Following construction of the project, the storm drainage system shall be inspected and maintained according to their respective maintenance checklists included at the end of this manual. Facilities will be inspected annually, or after every significant storm event where the precipitation is greater than or equal to one inch in 24 hours. When deficiencies are noted, the problems are to be corrected as soon as possible. Any spill of hazardous material (e.g. fuel, lubricant, herbicide, etc.) shall be cleaned up immediately and shall be reported to the Division of Emergency Management (1-800-258-5990). Contaminated material will be disposed of properly. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 32 Any questions about the existence of a problem should be directed to a Professional Engineer. 10.5 Annual Cost Estimate The approximate annual cost for the under-drains and conveyance elements has been estimated to be $5,000. KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 33 Cover Sheet for Inspection Forms Name of Inspector: _____________________________________________________________ Date of Inspection: _____________________________________________________________ Number of Sheets Attached: _____________________________________________________________ Inspector’s Signature: _____________________________________________________________ KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 34 Maintenance Log Action Taken Name Date How Procedure Was Performed Problems Encountered Additional Actions Recommended KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 35 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 36 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 37 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 38 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 39 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 40 A.1 TIR Worksheet KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 41 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 42 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 43 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 44 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 45 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 46 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 47 A.2 City Correspondence KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 48 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 49 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 50 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 51 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 52 KIWANIS PARK IMPROVEMENTS TECHNICAL INFORMATION REPORT SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON 53 A.3 WWHM Reports WWHM2012 PROJECT REPORT FLOW CONTROL ANALYSIS 2021-09-24 Flow Control 9/24/2021 10:31:19 AM Page 2 General Model Information Project Name:2021-09-24 Flow Control Site Name: Site Address: City: Report Date:9/24/2021 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2018/10/10 Version:4.2.16 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year 2021-09-24 Flow Control 9/24/2021 10:31:19 AM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre C, Forest, Mod 0.544 Pervious Total 0.544 Impervious Land Use acre Impervious Total 0 Basin Total 0.544 Element Flows To: Surface Interflow Groundwater 2021-09-24 Flow Control 9/24/2021 10:31:19 AM Page 4 Mitigated Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre ROADS FLAT 0.544 Impervious Total 0.544 Basin Total 0.544 Element Flows To: Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 2021-09-24 Flow Control 9/24/2021 10:31:19 AM Page 5 Routing Elements Predeveloped Routing 2021-09-24 Flow Control 9/24/2021 10:31:19 AM Page 6 Mitigated Routing Trapezoidal Pond 1 Bottom Length:52.17 ft. Bottom Width:52.17 ft. Depth:4 ft. Volume at riser head:0.2621 acre-feet. Side slope 1:3 To 1 Side slope 2:3 To 1 Side slope 3:3 To 1 Side slope 4:3 To 1 Discharge Structure Riser Height:3 ft. Riser Diameter:18 in. Notch Type:Rectangular Notch Width:0.010 ft. Notch Height:1.006 ft. Orifice 1 Diameter:0.467 in.Elevation:0 ft. Element Flows To: Outlet 1 Outlet 2 Pond Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.062 0.000 0.000 0.000 0.0444 0.063 0.002 0.001 0.000 0.0889 0.063 0.005 0.001 0.000 0.1333 0.064 0.008 0.002 0.000 0.1778 0.065 0.011 0.002 0.000 0.2222 0.065 0.014 0.002 0.000 0.2667 0.066 0.017 0.003 0.000 0.3111 0.067 0.020 0.003 0.000 0.3556 0.067 0.023 0.003 0.000 0.4000 0.068 0.026 0.003 0.000 0.4444 0.069 0.029 0.003 0.000 0.4889 0.069 0.032 0.004 0.000 0.5333 0.070 0.035 0.004 0.000 0.5778 0.071 0.038 0.004 0.000 0.6222 0.071 0.041 0.004 0.000 0.6667 0.072 0.044 0.004 0.000 0.7111 0.073 0.048 0.005 0.000 0.7556 0.073 0.051 0.005 0.000 0.8000 0.074 0.054 0.005 0.000 0.8444 0.075 0.058 0.005 0.000 0.8889 0.075 0.061 0.005 0.000 0.9333 0.076 0.064 0.005 0.000 0.9778 0.077 0.068 0.005 0.000 1.0222 0.078 0.071 0.006 0.000 1.0667 0.078 0.075 0.006 0.000 1.1111 0.079 0.078 0.006 0.000 1.1556 0.080 0.082 0.006 0.000 1.2000 0.080 0.085 0.006 0.000 1.2444 0.081 0.089 0.006 0.000 1.2889 0.082 0.093 0.006 0.000 1.3333 0.083 0.096 0.006 0.000 1.3778 0.083 0.100 0.006 0.000 2021-09-24 Flow Control 9/24/2021 10:31:19 AM Page 7 1.4222 0.084 0.104 0.007 0.000 1.4667 0.085 0.108 0.007 0.000 1.5111 0.086 0.111 0.007 0.000 1.5556 0.086 0.115 0.007 0.000 1.6000 0.087 0.119 0.007 0.000 1.6444 0.088 0.123 0.007 0.000 1.6889 0.089 0.127 0.007 0.000 1.7333 0.089 0.131 0.007 0.000 1.7778 0.090 0.135 0.007 0.000 1.8222 0.091 0.139 0.008 0.000 1.8667 0.092 0.143 0.008 0.000 1.9111 0.093 0.147 0.008 0.000 1.9556 0.093 0.151 0.008 0.000 2.0000 0.094 0.155 0.008 0.000 2.0444 0.095 0.160 0.008 0.000 2.0889 0.096 0.164 0.009 0.000 2.1333 0.096 0.168 0.010 0.000 2.1778 0.097 0.173 0.011 0.000 2.2222 0.098 0.177 0.012 0.000 2.2667 0.099 0.181 0.013 0.000 2.3111 0.100 0.186 0.014 0.000 2.3556 0.100 0.190 0.015 0.000 2.4000 0.101 0.195 0.017 0.000 2.4444 0.102 0.199 0.018 0.000 2.4889 0.103 0.204 0.019 0.000 2.5333 0.104 0.208 0.021 0.000 2.5778 0.105 0.213 0.022 0.000 2.6222 0.105 0.218 0.024 0.000 2.6667 0.106 0.223 0.025 0.000 2.7111 0.107 0.227 0.027 0.000 2.7556 0.108 0.232 0.028 0.000 2.8000 0.109 0.237 0.030 0.000 2.8444 0.110 0.242 0.031 0.000 2.8889 0.110 0.247 0.033 0.000 2.9333 0.111 0.252 0.034 0.000 2.9778 0.112 0.257 0.036 0.000 3.0222 0.113 0.262 0.089 0.000 3.0667 0.114 0.267 0.310 0.000 3.1111 0.115 0.272 0.625 0.000 3.1556 0.116 0.277 1.007 0.000 3.2000 0.116 0.282 1.441 0.000 3.2444 0.117 0.287 1.914 0.000 3.2889 0.118 0.293 2.412 0.000 3.3333 0.119 0.298 2.920 0.000 3.3778 0.120 0.303 3.424 0.000 3.4222 0.121 0.309 3.909 0.000 3.4667 0.122 0.314 4.363 0.000 3.5111 0.123 0.319 4.775 0.000 3.5556 0.124 0.325 5.135 0.000 3.6000 0.124 0.330 5.439 0.000 3.6444 0.125 0.336 5.687 0.000 3.6889 0.126 0.342 5.887 0.000 3.7333 0.127 0.347 6.052 0.000 3.7778 0.128 0.353 6.288 0.000 3.8222 0.129 0.359 6.464 0.000 3.8667 0.130 0.365 6.635 0.000 3.9111 0.131 0.370 6.803 0.000 3.9556 0.132 0.376 6.966 0.000 2021-09-24 Flow Control 9/24/2021 10:31:19 AM Page 8 4.0000 0.133 0.382 7.125 0.000 4.0444 0.134 0.388 7.281 0.000 2021-09-24 Flow Control 9/24/2021 10:31:19 AM Page 9 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.544 Total Impervious Area:0 Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.544 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.016198 5 year 0.026541 10 year 0.033192 25 year 0.041104 50 year 0.046583 100 year 0.051702 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.009609 5 year 0.014935 10 year 0.019453 25 year 0.026483 50 year 0.032811 100 year 0.040194 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.019 0.007 1950 0.022 0.008 1951 0.035 0.027 1952 0.011 0.006 1953 0.009 0.008 1954 0.014 0.007 1955 0.022 0.007 1956 0.018 0.016 1957 0.014 0.007 1958 0.016 0.008 2021-09-24 Flow Control 9/24/2021 10:31:49 AM Page 10 1959 0.014 0.007 1960 0.024 0.019 1961 0.013 0.009 1962 0.008 0.007 1963 0.011 0.008 1964 0.016 0.010 1965 0.011 0.012 1966 0.010 0.008 1967 0.025 0.008 1968 0.014 0.008 1969 0.014 0.007 1970 0.011 0.008 1971 0.012 0.008 1972 0.027 0.021 1973 0.012 0.012 1974 0.013 0.008 1975 0.018 0.007 1976 0.013 0.008 1977 0.002 0.007 1978 0.011 0.008 1979 0.007 0.006 1980 0.032 0.023 1981 0.010 0.008 1982 0.021 0.016 1983 0.018 0.008 1984 0.011 0.007 1985 0.006 0.007 1986 0.028 0.008 1987 0.024 0.017 1988 0.010 0.007 1989 0.006 0.007 1990 0.059 0.018 1991 0.031 0.021 1992 0.013 0.008 1993 0.012 0.007 1994 0.004 0.006 1995 0.018 0.010 1996 0.041 0.025 1997 0.032 0.027 1998 0.008 0.007 1999 0.035 0.021 2000 0.012 0.008 2001 0.002 0.006 2002 0.014 0.010 2003 0.021 0.008 2004 0.023 0.029 2005 0.017 0.007 2006 0.019 0.016 2007 0.044 0.036 2008 0.054 0.022 2009 0.025 0.011 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0587 0.0362 2 0.0540 0.0285 3 0.0443 0.0267 2021-09-24 Flow Control 9/24/2021 10:31:49 AM Page 11 4 0.0411 0.0266 5 0.0354 0.0247 6 0.0348 0.0233 7 0.0317 0.0221 8 0.0316 0.0214 9 0.0311 0.0213 10 0.0278 0.0212 11 0.0269 0.0189 12 0.0252 0.0182 13 0.0249 0.0173 14 0.0245 0.0163 15 0.0244 0.0159 16 0.0228 0.0159 17 0.0221 0.0120 18 0.0220 0.0119 19 0.0214 0.0112 20 0.0205 0.0097 21 0.0191 0.0095 22 0.0186 0.0095 23 0.0184 0.0095 24 0.0178 0.0084 25 0.0177 0.0084 26 0.0175 0.0084 27 0.0169 0.0083 28 0.0163 0.0082 29 0.0159 0.0082 30 0.0143 0.0081 31 0.0143 0.0080 32 0.0140 0.0079 33 0.0138 0.0079 34 0.0136 0.0079 35 0.0136 0.0077 36 0.0134 0.0077 37 0.0132 0.0077 38 0.0131 0.0077 39 0.0127 0.0076 40 0.0124 0.0076 41 0.0123 0.0076 42 0.0123 0.0075 43 0.0119 0.0075 44 0.0115 0.0074 45 0.0111 0.0074 46 0.0111 0.0074 47 0.0109 0.0074 48 0.0108 0.0073 49 0.0106 0.0073 50 0.0104 0.0071 51 0.0099 0.0070 52 0.0097 0.0070 53 0.0090 0.0069 54 0.0084 0.0067 55 0.0078 0.0066 56 0.0067 0.0066 57 0.0064 0.0066 58 0.0063 0.0064 59 0.0042 0.0061 60 0.0022 0.0060 61 0.0019 0.0058 2021-09-24 Flow Control 9/24/2021 10:31:49 AM Page 12 2021-09-24 Flow Control 9/24/2021 10:31:49 AM Page 13 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.0081 17075 14508 84 Pass 0.0085 15481 8461 54 Pass 0.0089 14067 7219 51 Pass 0.0093 12795 6459 50 Pass 0.0097 11567 5852 50 Pass 0.0100 10521 5441 51 Pass 0.0104 9563 5073 53 Pass 0.0108 8750 4733 54 Pass 0.0112 8055 4348 53 Pass 0.0116 7360 4004 54 Pass 0.0120 6744 3694 54 Pass 0.0124 6192 3388 54 Pass 0.0128 5730 3159 55 Pass 0.0132 5309 2915 54 Pass 0.0135 4924 2757 55 Pass 0.0139 4573 2590 56 Pass 0.0143 4246 2438 57 Pass 0.0147 3957 2291 57 Pass 0.0151 3645 2135 58 Pass 0.0155 3390 1982 58 Pass 0.0159 3133 1821 58 Pass 0.0163 2915 1701 58 Pass 0.0167 2706 1581 58 Pass 0.0170 2490 1468 58 Pass 0.0174 2319 1351 58 Pass 0.0178 2136 1257 58 Pass 0.0182 1973 1128 57 Pass 0.0186 1825 1040 56 Pass 0.0190 1702 952 55 Pass 0.0194 1577 870 55 Pass 0.0198 1442 798 55 Pass 0.0201 1327 729 54 Pass 0.0205 1233 661 53 Pass 0.0209 1148 594 51 Pass 0.0213 1086 521 47 Pass 0.0217 1020 483 47 Pass 0.0221 947 443 46 Pass 0.0225 886 410 46 Pass 0.0229 824 377 45 Pass 0.0233 761 322 42 Pass 0.0236 725 302 41 Pass 0.0240 675 283 41 Pass 0.0244 623 266 42 Pass 0.0248 589 243 41 Pass 0.0252 549 230 41 Pass 0.0256 506 216 42 Pass 0.0260 469 198 42 Pass 0.0264 428 178 41 Pass 0.0268 388 154 39 Pass 0.0271 356 147 41 Pass 0.0275 328 139 42 Pass 0.0279 298 126 42 Pass 0.0283 270 118 43 Pass 2021-09-24 Flow Control 9/24/2021 10:31:49 AM Page 14 0.0287 241 107 44 Pass 0.0291 218 105 48 Pass 0.0295 198 94 47 Pass 0.0299 174 87 50 Pass 0.0303 152 82 53 Pass 0.0306 130 72 55 Pass 0.0310 119 66 55 Pass 0.0314 104 62 59 Pass 0.0318 95 58 61 Pass 0.0322 83 54 65 Pass 0.0326 74 51 68 Pass 0.0330 69 47 68 Pass 0.0334 61 43 70 Pass 0.0338 53 40 75 Pass 0.0341 46 38 82 Pass 0.0345 39 34 87 Pass 0.0349 29 30 103 Pass 0.0353 25 21 84 Pass 0.0357 22 16 72 Pass 0.0361 20 7 35 Pass 0.0365 17 0 0 Pass 0.0369 14 0 0 Pass 0.0373 12 0 0 Pass 0.0376 8 0 0 Pass 0.0380 7 0 0 Pass 0.0384 7 0 0 Pass 0.0388 7 0 0 Pass 0.0392 6 0 0 Pass 0.0396 6 0 0 Pass 0.0400 6 0 0 Pass 0.0404 6 0 0 Pass 0.0408 6 0 0 Pass 0.0411 5 0 0 Pass 0.0415 5 0 0 Pass 0.0419 5 0 0 Pass 0.0423 5 0 0 Pass 0.0427 5 0 0 Pass 0.0431 5 0 0 Pass 0.0435 5 0 0 Pass 0.0439 4 0 0 Pass 0.0443 4 0 0 Pass 0.0446 3 0 0 Pass 0.0450 3 0 0 Pass 0.0454 3 0 0 Pass 0.0458 3 0 0 Pass 0.0462 3 0 0 Pass 0.0466 3 0 0 Pass 2021-09-24 Flow Control 9/24/2021 10:31:49 AM Page 15 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. 2021-09-24 Flow Control 9/24/2021 10:31:49 AM Page 16 LID Report 2021-09-24 Flow Control 9/24/2021 10:32:10 AM Page 17 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 2021-09-24 Flow Control 9/24/2021 10:32:10 AM Page 18 Appendix Predeveloped Schematic 2021-09-24 Flow Control 9/24/2021 10:32:12 AM Page 19 Mitigated Schematic 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 20 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 2021-09-24 Flow Control.wdm MESSU 25 Pre2021-09-24 Flow Control.MES 27 Pre2021-09-24 Flow Control.L61 28 Pre2021-09-24 Flow Control.L62 30 POC2021-09-24 Flow Control1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 PERLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 C, Forest, Mod 1 1 1 1 27 0 END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** 11 0 0 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* 11 0 0 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 21 PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 11 0 0 0 0 0 0 0 0 0 0 0 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC 11 0 4.5 0.08 400 0.1 0.5 0.996 END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP 11 0 0 2 2 0 0 0 END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** 11 0.2 0.5 0.35 6 0.5 0.7 END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS 11 0 0 0 0 2.5 1 0 END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS END IWAT-STATE1 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 22 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** PERLND 11 0.544 COPY 501 12 PERLND 11 0.544 COPY 501 13 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 23 WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 12 PERLND PWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 12 MASS-LINK 13 PERLND PWATER IFWO 0.083333 COPY INPUT MEAN END MASS-LINK 13 END MASS-LINK END RUN 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 24 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 2021-09-24 Flow Control.wdm MESSU 25 Mit2021-09-24 Flow Control.MES 27 Mit2021-09-24 Flow Control.L61 28 Mit2021-09-24 Flow Control.L62 30 POC2021-09-24 Flow Control1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 IMPLND 1 RCHRES 1 COPY 1 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Trapezoidal Pond 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* END PRINT-INFO PWAT-PARM1 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 25 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 1 ROADS/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 1 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 1 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 1 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 1 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 1 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 1 0 0 END IWAT-STATE1 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 26 END IMPLND SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** IMPLND 1 0.544 RCHRES 1 5 ******Routing****** IMPLND 1 0.544 COPY 1 15 RCHRES 1 1 COPY 501 16 END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** 1 Trapezoidal Pond-008 1 1 1 1 28 0 1 END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** 1 1 0 0 0 0 0 0 0 0 0 END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* 1 4 0 0 0 0 0 0 0 0 0 1 9 END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** 1 0 1 0 0 4 0 0 0 0 0 0 0 0 0 2 2 2 2 2 END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** 1 1 0.01 0.0 0.0 0.5 0.0 END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> 1 0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 27 FTABLES FTABLE 1 91 4 Depth Area Volume Outflow1 Velocity Travel Time*** (ft) (acres) (acre-ft) (cfs) (ft/sec) (Minutes)*** 0.000000 0.062488 0.000000 0.000000 0.044444 0.063129 0.002791 0.001248 0.088889 0.063773 0.005612 0.001764 0.133333 0.064419 0.008460 0.002161 0.177778 0.065070 0.011338 0.002495 0.222222 0.065723 0.014244 0.002790 0.266667 0.066380 0.017180 0.003056 0.311111 0.067040 0.020145 0.003301 0.355556 0.067703 0.023139 0.003529 0.400000 0.068370 0.026163 0.003743 0.444444 0.069040 0.029216 0.003945 0.488889 0.069713 0.032300 0.004138 0.533333 0.070389 0.035413 0.004322 0.577778 0.071069 0.038557 0.004499 0.622222 0.071751 0.041730 0.004668 0.666667 0.072438 0.044935 0.004832 0.711111 0.073127 0.048169 0.004991 0.755556 0.073820 0.051435 0.005144 0.800000 0.074515 0.054731 0.005293 0.844444 0.075215 0.058059 0.005438 0.888889 0.075917 0.061417 0.005580 0.933333 0.076623 0.064807 0.005718 0.977778 0.077332 0.068228 0.005852 1.022222 0.078044 0.071681 0.005984 1.066667 0.078760 0.075165 0.006112 1.111111 0.079478 0.078682 0.006238 1.155556 0.080200 0.082230 0.006362 1.200000 0.080926 0.085811 0.006483 1.244444 0.081654 0.089424 0.006602 1.288889 0.082386 0.093069 0.006719 1.333333 0.083121 0.096747 0.006834 1.377778 0.083860 0.100458 0.006947 1.422222 0.084601 0.104201 0.007058 1.466667 0.085346 0.107978 0.007167 1.511111 0.086094 0.111788 0.007275 1.555556 0.086846 0.115631 0.007381 1.600000 0.087600 0.119507 0.007486 1.644444 0.088358 0.123417 0.007589 1.688889 0.089120 0.127361 0.007691 1.733333 0.089884 0.131339 0.007792 1.777778 0.090652 0.135351 0.007891 1.822222 0.091423 0.139397 0.007989 1.866667 0.092197 0.143478 0.008086 1.911111 0.092975 0.147593 0.008182 1.955556 0.093755 0.151742 0.008276 2.000000 0.094540 0.155927 0.008385 2.044444 0.095327 0.160146 0.008837 2.088889 0.096117 0.164400 0.009510 2.133333 0.096911 0.168690 0.010330 2.177778 0.097708 0.173015 0.011263 2.222222 0.098509 0.177375 0.012289 2.266667 0.099313 0.181771 0.013395 2.311111 0.100119 0.186203 0.014569 2.355556 0.100930 0.190671 0.015802 2.400000 0.101743 0.195174 0.017086 2.444444 0.102560 0.199714 0.018416 2.488889 0.103380 0.204291 0.019785 2.533333 0.104203 0.208904 0.021190 2.577778 0.105030 0.213553 0.022624 2.622222 0.105859 0.218240 0.024084 2.666667 0.106692 0.222963 0.025567 2.711111 0.107529 0.227724 0.027070 2.755556 0.108368 0.232521 0.028587 2.800000 0.109211 0.237357 0.030118 2.844444 0.110057 0.242229 0.031659 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 28 2.888889 0.110907 0.247140 0.033207 2.933333 0.111759 0.252088 0.034760 2.977778 0.112615 0.257074 0.036316 3.022222 0.113474 0.262098 0.089910 3.066667 0.114337 0.267160 0.310943 3.111111 0.115203 0.272261 0.625128 3.155556 0.116072 0.277401 1.007398 3.200000 0.116944 0.282579 1.441935 3.244444 0.117819 0.287796 1.914854 3.288889 0.118698 0.293052 2.412341 3.333333 0.119580 0.298347 2.920209 3.377778 0.120465 0.303681 3.424044 3.422222 0.121354 0.309055 3.909689 3.466667 0.122246 0.314468 4.363930 3.511111 0.123141 0.319921 4.775366 3.555556 0.124039 0.325414 5.135397 3.600000 0.124941 0.330947 5.439334 3.644444 0.125846 0.336520 5.687602 3.688889 0.126754 0.342133 5.887045 3.733333 0.127665 0.347787 6.052309 3.777778 0.128580 0.353481 6.288240 3.822222 0.129498 0.359217 6.464395 3.866667 0.130419 0.364992 6.635850 3.911111 0.131343 0.370809 6.802964 3.955556 0.132271 0.376668 6.966051 4.000000 0.133202 0.382567 7.125388 END FTABLE 1 END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** RCHRES 1 HYDR RO 1 1 1 WDM 1000 FLOW ENGL REPL RCHRES 1 HYDR STAGE 1 1 1 WDM 1001 STAG ENGL REPL COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 5 IMPLND IWATER SURO 0.083333 RCHRES INFLOW IVOL END MASS-LINK 5 MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 MASS-LINK 16 RCHRES ROFLOW COPY INPUT MEAN END MASS-LINK 16 END MASS-LINK END RUN 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 29 Predeveloped HSPF Message File 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 30 Mitigated HSPF Message File 2021-09-24 Flow Control 9/24/2021 10:32:13 AM Page 31 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2021; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com WWHM2012 PROJECT REPORT WATER QUALITY ANALYSIS 2021-09-24 WQ Calc 9/24/2021 10:33:59 AM Page 2 General Model Information Project Name:2021-09-24 WQ Calc Site Name: Site Address: City: Report Date:9/24/2021 Gage:Seatac Data Start:1948/10/01 Data End:2009/09/30 Timestep:15 Minute Precip Scale:1.000 Version Date:2018/10/10 Version:4.2.16 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year 2021-09-24 WQ Calc 9/24/2021 10:33:59 AM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre PARKING FLAT 0.616 Impervious Total 0.616 Basin Total 0.616 Element Flows To: Surface Interflow Groundwater 2021-09-24 WQ Calc 9/24/2021 10:33:59 AM Page 4 Mitigated Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre Pervious Total 0 Impervious Land Use acre PARKING FLAT 0.616 Impervious Total 0.616 Basin Total 0.616 Element Flows To: Surface Interflow Groundwater 2021-09-24 WQ Calc 9/24/2021 10:33:59 AM Page 5 Routing Elements Predeveloped Routing 2021-09-24 WQ Calc 9/24/2021 10:33:59 AM Page 6 Mitigated Routing 2021-09-24 WQ Calc 9/24/2021 10:33:59 AM Page 7 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.616 Mitigated Landuse Totals for POC #1 Total Pervious Area:0 Total Impervious Area:0.616 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.234859 5 year 0.296654 10 year 0.33864 25 year 0.393101 50 year 0.434785 100 year 0.47748 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.234859 5 year 0.296654 10 year 0.33864 25 year 0.393101 50 year 0.434785 100 year 0.47748 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1949 0.304 0.304 1950 0.329 0.329 1951 0.190 0.190 1952 0.169 0.169 1953 0.183 0.183 1954 0.191 0.191 1955 0.217 0.217 1956 0.213 0.213 1957 0.242 0.242 1958 0.195 0.195 2021-09-24 WQ Calc 9/24/2021 10:34:25 AM Page 8 1959 0.199 0.199 1960 0.195 0.195 1961 0.207 0.207 1962 0.180 0.180 1963 0.200 0.200 1964 0.196 0.196 1965 0.249 0.249 1966 0.166 0.166 1967 0.287 0.287 1968 0.326 0.326 1969 0.227 0.227 1970 0.219 0.219 1971 0.261 0.261 1972 0.269 0.269 1973 0.163 0.163 1974 0.238 0.238 1975 0.274 0.274 1976 0.184 0.184 1977 0.200 0.200 1978 0.244 0.244 1979 0.334 0.334 1980 0.300 0.300 1981 0.245 0.245 1982 0.346 0.346 1983 0.282 0.282 1984 0.178 0.178 1985 0.245 0.245 1986 0.212 0.212 1987 0.327 0.327 1988 0.199 0.199 1989 0.248 0.248 1990 0.419 0.419 1991 0.334 0.334 1992 0.176 0.176 1993 0.152 0.152 1994 0.166 0.166 1995 0.218 0.218 1996 0.232 0.232 1997 0.225 0.225 1998 0.228 0.228 1999 0.466 0.466 2000 0.232 0.232 2001 0.255 0.255 2002 0.298 0.298 2003 0.231 0.231 2004 0.436 0.436 2005 0.199 0.199 2006 0.176 0.176 2007 0.408 0.408 2008 0.329 0.329 2009 0.304 0.304 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.4664 0.4664 2 0.4363 0.4363 3 0.4185 0.4185 2021-09-24 WQ Calc 9/24/2021 10:34:25 AM Page 9 4 0.4078 0.4078 5 0.3461 0.3461 6 0.3344 0.3344 7 0.3343 0.3343 8 0.3287 0.3287 9 0.3285 0.3285 10 0.3275 0.3275 11 0.3262 0.3262 12 0.3042 0.3042 13 0.3036 0.3036 14 0.3000 0.3000 15 0.2976 0.2976 16 0.2869 0.2869 17 0.2817 0.2817 18 0.2742 0.2742 19 0.2694 0.2694 20 0.2610 0.2610 21 0.2551 0.2551 22 0.2490 0.2490 23 0.2484 0.2484 24 0.2454 0.2454 25 0.2449 0.2449 26 0.2443 0.2443 27 0.2417 0.2417 28 0.2380 0.2380 29 0.2321 0.2321 30 0.2316 0.2316 31 0.2312 0.2312 32 0.2280 0.2280 33 0.2268 0.2268 34 0.2249 0.2249 35 0.2188 0.2188 36 0.2176 0.2176 37 0.2166 0.2166 38 0.2131 0.2131 39 0.2122 0.2122 40 0.2065 0.2065 41 0.1999 0.1999 42 0.1997 0.1997 43 0.1994 0.1994 44 0.1989 0.1989 45 0.1987 0.1987 46 0.1960 0.1960 47 0.1952 0.1952 48 0.1951 0.1951 49 0.1910 0.1910 50 0.1900 0.1900 51 0.1844 0.1844 52 0.1825 0.1825 53 0.1799 0.1799 54 0.1777 0.1777 55 0.1761 0.1761 56 0.1760 0.1760 57 0.1690 0.1690 58 0.1665 0.1665 59 0.1658 0.1658 60 0.1631 0.1631 61 0.1524 0.1524 2021-09-24 WQ Calc 9/24/2021 10:34:25 AM Page 10 2021-09-24 WQ Calc 9/24/2021 10:34:25 AM Page 11 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.1174 1827 1827 100 Pass 0.1206 1683 1683 100 Pass 0.1238 1519 1519 100 Pass 0.1270 1344 1344 100 Pass 0.1303 1233 1233 100 Pass 0.1335 1121 1121 100 Pass 0.1367 1023 1023 100 Pass 0.1399 947 947 100 Pass 0.1431 854 854 100 Pass 0.1463 798 798 100 Pass 0.1495 734 734 100 Pass 0.1527 682 682 100 Pass 0.1559 622 622 100 Pass 0.1591 572 572 100 Pass 0.1623 538 538 100 Pass 0.1655 495 495 100 Pass 0.1687 453 453 100 Pass 0.1719 424 424 100 Pass 0.1751 389 389 100 Pass 0.1783 366 366 100 Pass 0.1815 343 343 100 Pass 0.1847 320 320 100 Pass 0.1880 300 300 100 Pass 0.1912 272 272 100 Pass 0.1944 257 257 100 Pass 0.1976 241 241 100 Pass 0.2008 223 223 100 Pass 0.2040 211 211 100 Pass 0.2072 196 196 100 Pass 0.2104 181 181 100 Pass 0.2136 173 173 100 Pass 0.2168 165 165 100 Pass 0.2200 148 148 100 Pass 0.2232 139 139 100 Pass 0.2264 135 135 100 Pass 0.2296 123 123 100 Pass 0.2328 116 116 100 Pass 0.2360 108 108 100 Pass 0.2392 105 105 100 Pass 0.2424 100 100 100 Pass 0.2457 93 93 100 Pass 0.2489 89 89 100 Pass 0.2521 84 84 100 Pass 0.2553 74 74 100 Pass 0.2585 72 72 100 Pass 0.2617 67 67 100 Pass 0.2649 65 65 100 Pass 0.2681 62 62 100 Pass 0.2713 58 58 100 Pass 0.2745 55 55 100 Pass 0.2777 54 54 100 Pass 0.2809 53 53 100 Pass 0.2841 50 50 100 Pass 2021-09-24 WQ Calc 9/24/2021 10:34:25 AM Page 12 0.2873 47 47 100 Pass 0.2905 45 45 100 Pass 0.2937 43 43 100 Pass 0.2969 39 39 100 Pass 0.3001 34 34 100 Pass 0.3034 32 32 100 Pass 0.3066 29 29 100 Pass 0.3098 28 28 100 Pass 0.3130 26 26 100 Pass 0.3162 22 22 100 Pass 0.3194 21 21 100 Pass 0.3226 20 20 100 Pass 0.3258 17 17 100 Pass 0.3290 13 13 100 Pass 0.3322 12 12 100 Pass 0.3354 9 9 100 Pass 0.3386 9 9 100 Pass 0.3418 9 9 100 Pass 0.3450 9 9 100 Pass 0.3482 8 8 100 Pass 0.3514 8 8 100 Pass 0.3546 8 8 100 Pass 0.3579 8 8 100 Pass 0.3611 8 8 100 Pass 0.3643 8 8 100 Pass 0.3675 8 8 100 Pass 0.3707 7 7 100 Pass 0.3739 7 7 100 Pass 0.3771 7 7 100 Pass 0.3803 7 7 100 Pass 0.3835 7 7 100 Pass 0.3867 7 7 100 Pass 0.3899 6 6 100 Pass 0.3931 6 6 100 Pass 0.3963 6 6 100 Pass 0.3995 6 6 100 Pass 0.4027 6 6 100 Pass 0.4059 6 6 100 Pass 0.4091 5 5 100 Pass 0.4123 5 5 100 Pass 0.4156 5 5 100 Pass 0.4188 4 4 100 Pass 0.4220 3 3 100 Pass 0.4252 2 2 100 Pass 0.4284 2 2 100 Pass 0.4316 2 2 100 Pass 0.4348 2 2 100 Pass 2021-09-24 WQ Calc 9/24/2021 10:34:25 AM Page 13 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0.0757 acre-feet On-line facility target flow:0.1 cfs. Adjusted for 15 min:0.1 cfs. Off-line facility target flow:0.0565 cfs. Adjusted for 15 min:0.0565 cfs. 2021-09-24 WQ Calc 9/24/2021 10:34:25 AM Page 14 LID Report 2021-09-24 WQ Calc 9/24/2021 10:34:44 AM Page 15 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 2021-09-24 WQ Calc 9/24/2021 10:34:44 AM Page 16 Appendix Predeveloped Schematic 2021-09-24 WQ Calc 9/24/2021 10:34:45 AM Page 17 Mitigated Schematic 2021-09-24 WQ Calc 9/24/2021 10:34:46 AM Page 18 Predeveloped UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 2021-09-24 WQ Calc.wdm MESSU 25 Pre2021-09-24 WQ Calc.MES 27 Pre2021-09-24 WQ Calc.L61 28 Pre2021-09-24 WQ Calc.L62 30 POC2021-09-24 WQ Calc1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 IMPLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 2021-09-24 WQ Calc 9/24/2021 10:34:46 AM Page 19 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 END IMPLND 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 20 SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** IMPLND 11 0.616 COPY 501 15 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 21 END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 501 OUTPUT MEAN 1 1 48.4 WDM 501 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 END MASS-LINK END RUN 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 22 Mitigated UCI File RUN GLOBAL WWHM4 model simulation START 1948 10 01 END 2009 09 30 RUN INTERP OUTPUT LEVEL 3 0 RESUME 0 RUN 1 UNIT SYSTEM 1 END GLOBAL FILES <File> <Un#> <-----------File Name------------------------------>*** <-ID-> *** WDM 26 2021-09-24 WQ Calc.wdm MESSU 25 Mit2021-09-24 WQ Calc.MES 27 Mit2021-09-24 WQ Calc.L61 28 Mit2021-09-24 WQ Calc.L62 30 POC2021-09-24 WQ Calc1.dat END FILES OPN SEQUENCE INGRP INDELT 00:15 IMPLND 11 COPY 501 DISPLY 1 END INGRP END OPN SEQUENCE DISPLY DISPLY-INFO1 # - #<----------Title----------->***TRAN PIVL DIG1 FIL1 PYR DIG2 FIL2 YRND 1 Basin 1 MAX 1 2 30 9 END DISPLY-INFO1 END DISPLY COPY TIMESERIES # - # NPT NMN *** 1 1 1 501 1 1 END TIMESERIES END COPY GENER OPCODE # # OPCD *** END OPCODE PARM # # K *** END PARM END GENER PERLND GEN-INFO <PLS ><-------Name------->NBLKS Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** END GEN-INFO *** Section PWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ***************************** PIVL PYR # - # ATMP SNOW PWAT SED PST PWG PQAL MSTL PEST NITR PHOS TRAC ********* END PRINT-INFO PWAT-PARM1 <PLS > PWATER variable monthly parameter value flags *** # - # CSNO RTOP UZFG VCS VUZ VNN VIFW VIRC VLE INFC HWT *** 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 23 END PWAT-PARM1 PWAT-PARM2 <PLS > PWATER input info: Part 2 *** # - # ***FOREST LZSN INFILT LSUR SLSUR KVARY AGWRC END PWAT-PARM2 PWAT-PARM3 <PLS > PWATER input info: Part 3 *** # - # ***PETMAX PETMIN INFEXP INFILD DEEPFR BASETP AGWETP END PWAT-PARM3 PWAT-PARM4 <PLS > PWATER input info: Part 4 *** # - # CEPSC UZSN NSUR INTFW IRC LZETP *** END PWAT-PARM4 PWAT-STATE1 <PLS > *** Initial conditions at start of simulation ran from 1990 to end of 1992 (pat 1-11-95) RUN 21 *** # - # *** CEPS SURS UZS IFWS LZS AGWS GWVS END PWAT-STATE1 END PERLND IMPLND GEN-INFO <PLS ><-------Name-------> Unit-systems Printer *** # - # User t-series Engl Metr *** in out *** 11 PARKING/FLAT 1 1 1 27 0 END GEN-INFO *** Section IWATER*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # ATMP SNOW IWAT SLD IWG IQAL *** 11 0 0 1 0 0 0 END ACTIVITY PRINT-INFO <ILS > ******** Print-flags ******** PIVL PYR # - # ATMP SNOW IWAT SLD IWG IQAL ********* 11 0 0 4 0 0 0 1 9 END PRINT-INFO IWAT-PARM1 <PLS > IWATER variable monthly parameter value flags *** # - # CSNO RTOP VRS VNN RTLI *** 11 0 0 0 0 0 END IWAT-PARM1 IWAT-PARM2 <PLS > IWATER input info: Part 2 *** # - # *** LSUR SLSUR NSUR RETSC 11 400 0.01 0.1 0.1 END IWAT-PARM2 IWAT-PARM3 <PLS > IWATER input info: Part 3 *** # - # ***PETMAX PETMIN 11 0 0 END IWAT-PARM3 IWAT-STATE1 <PLS > *** Initial conditions at start of simulation # - # *** RETS SURS 11 0 0 END IWAT-STATE1 END IMPLND 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 24 SCHEMATIC <-Source-> <--Area--> <-Target-> MBLK *** <Name> # <-factor-> <Name> # Tbl# *** Basin 1*** IMPLND 11 0.616 COPY 501 15 ******Routing****** END SCHEMATIC NETWORK <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** COPY 501 OUTPUT MEAN 1 1 48.4 DISPLY 1 INPUT TIMSER 1 <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # #<-factor->strg <Name> # # <Name> # # *** END NETWORK RCHRES GEN-INFO RCHRES Name Nexits Unit Systems Printer *** # - #<------------------><---> User T-series Engl Metr LKFG *** in out *** END GEN-INFO *** Section RCHRES*** ACTIVITY <PLS > ************* Active Sections ***************************** # - # HYFG ADFG CNFG HTFG SDFG GQFG OXFG NUFG PKFG PHFG *** END ACTIVITY PRINT-INFO <PLS > ***************** Print-flags ******************* PIVL PYR # - # HYDR ADCA CONS HEAT SED GQL OXRX NUTR PLNK PHCB PIVL PYR ********* END PRINT-INFO HYDR-PARM1 RCHRES Flags for each HYDR Section *** # - # VC A1 A2 A3 ODFVFG for each *** ODGTFG for each FUNCT for each FG FG FG FG possible exit *** possible exit possible exit * * * * * * * * * * * * * * *** END HYDR-PARM1 HYDR-PARM2 # - # FTABNO LEN DELTH STCOR KS DB50 *** <------><--------><--------><--------><--------><--------><--------> *** END HYDR-PARM2 HYDR-INIT RCHRES Initial conditions for each HYDR section *** # - # *** VOL Initial value of COLIND Initial value of OUTDGT *** ac-ft for each possible exit for each possible exit <------><--------> <---><---><---><---><---> *** <---><---><---><---><---> END HYDR-INIT END RCHRES SPEC-ACTIONS END SPEC-ACTIONS FTABLES END FTABLES EXT SOURCES <-Volume-> <Member> SsysSgap<--Mult-->Tran <-Target vols> <-Grp> <-Member-> *** <Name> # <Name> # tem strg<-factor->strg <Name> # # <Name> # # *** WDM 2 PREC ENGL 1 PERLND 1 999 EXTNL PREC WDM 2 PREC ENGL 1 IMPLND 1 999 EXTNL PREC WDM 1 EVAP ENGL 0.76 PERLND 1 999 EXTNL PETINP WDM 1 EVAP ENGL 0.76 IMPLND 1 999 EXTNL PETINP 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 25 END EXT SOURCES EXT TARGETS <-Volume-> <-Grp> <-Member-><--Mult-->Tran <-Volume-> <Member> Tsys Tgap Amd *** <Name> # <Name> # #<-factor->strg <Name> # <Name> tem strg strg*** COPY 1 OUTPUT MEAN 1 1 48.4 WDM 701 FLOW ENGL REPL COPY 501 OUTPUT MEAN 1 1 48.4 WDM 801 FLOW ENGL REPL END EXT TARGETS MASS-LINK <Volume> <-Grp> <-Member-><--Mult--> <Target> <-Grp> <-Member->*** <Name> <Name> # #<-factor-> <Name> <Name> # #*** MASS-LINK 15 IMPLND IWATER SURO 0.083333 COPY INPUT MEAN END MASS-LINK 15 END MASS-LINK END RUN 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 26 Predeveloped HSPF Message File 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 27 Mitigated HSPF Message File 2021-09-24 WQ Calc 9/24/2021 10:34:47 AM Page 28 Disclaimer Legal Notice This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by : Clear Creek Solutions, Inc. 2005-2021; All Rights Reserved. Clear Creek Solutions, Inc. 6200 Capitol Blvd. Ste F Olympia, WA. 98501 Toll Free 1(866)943-0304 Local (360)943-0304 www.clearcreeksolutions.com