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

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Treatment Control MeasuresSite designers proposing to use accepted proprietary device(s) on their project needto include the following items (to scale) on the improvement plans:• Plan view of device & appurtenances on the civil site plans• Section view of device & appurtenances in reference to other utilities• Detail drawings of device & appurtenances• Specifications and installation notes.City of Roseville. The City will develop its policy related to proprietary devices bysummer 2007. Check their web site for more details:www.roseville.ca.us/eu/stormwater_management/default.asp.ReferencesThe following references were used to develop this chapter.• California Stormwater Quality Association (CASQA), 2003. CaliforniaStormwater BMP Handbook for New Development and Redevelopment,www.cabmphandbooks.com.• Urban Storm Drainage Criteria Manual Volume 3 – Best Management Practices.Urban Drainage and Flood Control District. Denver, CO. September, 1999 (Rev.October, 2005).• Stormwater Quality Requirements for Development Applications – StormwaterC.3 Guidebook, 2nd Edition, March 2005. Contra Costa Clean Water Program.www.cccleanwater.org/construction/index.php• Stormwater Management Manual, 2004. City of Portland Bureau ofEnvironmental Services. www.portlandonline.com/bes• Maintaining your Stormwater Management Facility, 2002. City of PortlandBureau of Environmental Services. www.portlandonline.com/bes• Georgia Stormwater Management Manual, Volume 2 Technical Handbook.Atlanta Regional Commission. August 2001. www.georgiastormwater.com• Land Development Guidelines. Ventura Countywide Stormwater QualityManagement Program. August 2001.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007 6-5
Runoff Treatment Control Measure Fact SheetConstructed Wetland BasinDescriptionWest David Pond. Photo: Larry Walker AssociatesA constructed wetland basin is an earthen basintreatment system with a permanent pool of waterthat includes four zones: a forebay, an open-waterzone, a wetland zone with aquatic plants, and anoutlet zone. The basin contains an area above thepermanent pool to retain runoff from thestormwater quality design storm (water qualityvolume or WQV) and slowly release excess waterover a specified drawdown period. Constructedwetland basins provide a significant naturalamenity to a community. The basin pictured islocated near Village Homes in Davis.Siting Considerations• Tributary Drainage Area: Up to 100 acres.• Soil Type: Most appropriate for Type C and D soils. For TypeA and B soils, use an impermeable (e.g., clay) liner.• Topography: Not appropriate on fill or steep slopes.Vector Considerations• Potential for mosquitoes exists due to permanent water pool.However, proper design of permanent pool zones, routinevegetation management, and introduction of mosquito fish willminimize the risk.Advantages• Reduces stormwater discharge to surface waters during moststorm events.• Reduces peak flows during small storm events.• Can provide wildlife habitat, high aesthetic value and passiverecreational opportunities.POLLUTANT REMOVALEFFECTIVENESSSedimentNutrientsTrashMetals*Bacteria*Oil and GreaseOrganics*HighMediumHighHighHighHighHigh*The following are target pollutants forSacramento area: copper; lead; mercury;pathogens; diazinon; and chlorpyrifosSource: CASQA California StormwaterBMP Handbook, January 2003Limitations• Supplemental water supply or perennial base flow is required to maintain the permanent pool.• Public safety related to access must be considered; security fencing is generally required by mostpermitting agencies in urban settings.• Will typically require five years to establish.General Maintenance Recommendations (Moderate to High)• Inspect basin annually in early spring.• Periodically remove debris from inlet and outlet structures, and wetland basin itself.• Regularly harvest vegetation and stock with mosquito fish for mosquito control.• Remove accumulated sediment from forebay and other water zones as needed.• Inspect seasonally for abnormal algae growth and address as needed.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007CWB-1
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Stormwater Quality Design Manualfor
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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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Introduction• The Appendices prov
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2 An Integrated Approach toEffectiv
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Integrated ApproachIt is also helpf
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Integrated ApproachPut landscaping
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Integrated Approachfactors will be
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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 3As the name implies (and a
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Chapter 3Step 9: Establish Long Ter
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Chapter 4Source Control Fact Sheets
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Source Control Measure Fact SheetSt
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Source Control Measure Fact SheetFu
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Source Control Measure Fact SheetLo
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Source Control Measure Fact SheetOu
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5 Runoff Reduction Control Measures
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Runoff Reduction Control MeasuresDe
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Runoff Reduction Control Measures
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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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GlossaryRegional Stormwater Quality
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Appendix ASubmittal RequirementsThe
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Sacramento County Supplemental Appl
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Example Post Construction Stormwate
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Typically maintenance agreements an
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Example Maintenance Covenant(Sacram
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Device in accordance with the maint
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[attach]DECLARANT’S ACKNOWLEGEMEN
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Recorded at the request of:CITY OF
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9. The obligations herein undertake
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EXHIBIT B[Map/Illustration]
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City of FolsomThe City of Folsom ow
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Appendix D-1: Residential Sites: Ru
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Form D-1d: Alternative Driveway Des
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Form D-2a: Disconnected Pavement Wo
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Appendix D-3Runoff Reduction Credit
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These tables refer to runoff reduct
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Mature TreeShape Canopy (dia.) Heig
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Appendix D4LID Credits Background R
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unoff from the driveway by 60% whil
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The designer must determine how man
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Or the ASCE-WEF method (Sacramento)
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Table 3 - Multipliers Based on Rati
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Using the Effective Area Managed in
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SMRC, The Stormwater Manager’s Re
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Flow-based control measure design s
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4. Apply the Rational Formula to ca
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5. Enter the capture curve selected
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1.201.000.80STORAGE (in)0.600.4024-
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1.201.000.80STORAGE (in)0.600.4048
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Subject: VEGETATED SWALE EXAMPLEPLA
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PART II:Routing Excess Runoff throu
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4. Design the OutletThe outlet shou
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Exhibit 1Water Quality Orifice Outl
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3. Calculate Planter Surface Area A
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• Bottom slopes of 0.01 to 0.05%
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Appendix HDrainage Design and Storm
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