Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

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SMRC, The Stormwater Manager’s Resource Center. Manual Builder.http://www.stormwatercenter.net/Manual_Builder/Credits/SITE/reforestation.htmSMRC, The Stormwater Manager’s Resource Center. Manual Builder.http://www.stormwatercenter.net/Manual_Builder/Credits/SITE/rooftop.htmStart at the Source - Design Guidance Manual for Stormwater Quality Protection, Bay Area StormwaterManagement Agencies Association, 1999.Stormwater C.3 Guidebook: Stormwater Quality Requirements for Development Applications. ContraCosta Clean Water Program. Contra Costa, CA, March 2005.Stormwater Pollution Prevention Manual: Best Management Practices for Business and ResidentialProperties. King County Department of Natural Resources and Parks, Water and Land ResourcesDivision, Stormwater Services Section. January 2005.Sustainable Infrastructure Alternative Paving Materials Subcommittee Report. City of Portland. October3, 2003.The Practice of Low Impact Development. U.S. Department of Housing and Urban Development.Washington, D.C. July 2003.Truckee Meadows Regional Storm Water Quality Management Program: Draft Low Impact DevelopmentHandbook. August 2005.Urban Storm Drainage Criteria Manual Volume 3 – Best Management Practices. Urban Drainage andFlood Control District. Denver, CO. September, 1999 (Rev. October, 2005).Virginia Stormwater Management Program Handbook. Virginia Department of Conservation andRecreation. 1999.Xiao Q., and E.G. McPherson. 2003. Rainfall interception by Santa Monica's municipal urban forest.Urban EcosystemsXiao, Q., E.G. McPherson, S.L. Ustin and M.E. Grismer. 2000. A new approach to modeling tree rainfallinterception. Journal of Geophysical Research 105(D23) :29,173-29,188.Xiao, Q. 1998. Rainfall interception by urban forests. Davis, CA: University of California. Ph.D.Dissertation.Xiao, Q., E.G. McPherson, S.L. Ustin, M.E. Grismer, and J.R. Simpson. 2000. Winter rainfallinterception by two mature open grown trees in Davis, CA. Hydrological Processes. 14(4):763-784.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007 Appendix D-4 Page 13
Appendix EDesign Requirements for Stormwater Quality Treatment Control Measures(Volume and Flow-Based Measures)The Sacramento Areawide and City of Roseville NPDES Municipal Stormwater Permits containprovisions that require the local municipal agencies to establish and enforce stormwater qualitytreatment standards for many new and redevelopment projects. This appendix presents theminimum standards for sizing the treatment control measures.General MethodologyFollow these steps:• Refer to Table 3-2 in this Design Manual to determine if your project requires treatmentcontrol measures.• Once you have made that determination, use the fact sheets in Chapter 6 to identify thetype of control measures most appropriate for your project site and whether or not thosemeasures are volume or flow-based.• (Optional) Use Chapter 5 and the runoff reduction worksheets in Appendix D to selectrunoff reduction measures for your project which will reduce the runoff discharged; thismay result in reduced treatment needs (and associated costs) for your project.• Use the rest of the information in this appendix to size the treatment control facilities foryour project.The local Sacramento agencies have developed a presumptive approach, whereby, if projectapplicants follow the methodology presented herein, it is presumed that the project is reducingstormwater pollution in runoff to the “maximum extent practicable” NPDES municipal permitstandard. A key principle here is that treatment control measures are most efficient andeconomical when they target small, frequent storm events that over time produce more totalrunoff than the larger, infrequent storms conventionally targeted for design of flood controlfacilities. Further, studies in other areas of the country have shown that much of the pollutantload is contained in the “first flush” of rainfall during a storm event, typically the first 0.5-inches.Targeting design storms larger than this may result in some improvements in pollutant removaleffectiveness, but at considerable cost.It is important to note that arbitrarily targeting large, infrequent storm events can actually reducethe pollutant removal capabilities of some treatment control measures. This occurs when outletstructures, detention times, and drain down times are designed to accommodate unusually largevolumes and high flows. When over-designed in this way, the more frequent, small storms thatproduce the most annual runoff and a large part of the pollutant load pass quickly through theover-sized facility and therefore receive inadequate treatment. (CASQA, 2003).Sizing Flow-Based Treatment Control MeasuresUse this method for sizing flow-based control measures (e.g., vegetated swales) in bothSacramento County and the City of Roseville.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007 Appendix E Page 1
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Table of contentsOutdoor Work Areas
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Table of contentsSF-1.SF-2.SF-3.SF-
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Other Development Community Reviewe
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1 IntroductionPurposeThis Stormwate
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IntroductionIn July 2003, the permi
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IntroductionFor redevelopment proje
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2 An Integrated Approach toEffectiv
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Chapter 3Figure 3-1. Process for Ad
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Chapter 3runoff reduction first (ev
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Chapter 4Source Control Fact Sheets
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5 Runoff Reduction Control Measures
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Runoff Treatment Control Measure Fa
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Technical RequirementsVegetated Swa
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Glossaryexposure of construction ma
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GlossaryLow Impact Development (LID
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Page 197 and 198: Appendix ASubmittal RequirementsThe
Page 199 and 200: Sacramento County Supplemental Appl
Page 201: Example Post Construction Stormwate
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Page 210 and 211: [attach]DECLARANT’S ACKNOWLEGEMEN
Page 212 and 213: Recorded at the request of:CITY OF
Page 214 and 215: 9. The obligations herein undertake
Page 216 and 217: EXHIBIT B[Map/Illustration]
Page 218 and 219: City of FolsomThe City of Folsom ow
Page 220 and 221: Appendix D-1: Residential Sites: Ru
Page 222: Form D-1d: Alternative Driveway Des
Page 225 and 226: Form D-2a: Disconnected Pavement Wo
Page 228 and 229: Appendix D-3Runoff Reduction Credit
Page 230 and 231: These tables refer to runoff reduct
Page 232 and 233: Mature TreeShape Canopy (dia.) Heig
Page 234 and 235: Appendix D4LID Credits Background R
Page 236 and 237: unoff from the driveway by 60% whil
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Page 240 and 241: Or the ASCE-WEF method (Sacramento)
Page 242 and 243: Table 3 - Multipliers Based on Rati
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Page 248 and 249: Flow-based control measure design s
Page 250 and 251: 4. Apply the Rational Formula to ca
Page 252 and 253: 5. Enter the capture curve selected
Page 254 and 255: 1.201.000.80STORAGE (in)0.600.4024-
Page 256 and 257: 1.201.000.80STORAGE (in)0.600.4048
Page 258 and 259: Subject: VEGETATED SWALE EXAMPLEPLA
Page 260: PART II:Routing Excess Runoff throu
Page 263 and 264: 4. Design the OutletThe outlet shou
Page 265 and 266: Exhibit 1Water Quality Orifice Outl
Page 267 and 268: 3. Calculate Planter Surface Area A
Page 269 and 270: • Bottom slopes of 0.01 to 0.05%
Page 271: Appendix HDrainage Design and Storm
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