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

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Runoff Reduction Control Measure Fact SheetInterceptor TreesReferences• Schueler T., Swann C., Wright T, and S. Sprinkle. 2004. Urban Subwatershed RestorationManual No 8: Pollution Source Control Practices. Version 1.0. Center for Watershed Protection.Ellicot City, MD. July 2004.• Cappiella, K. 2004. Urban Watershed Forestry Manual (draft). Prepared for USDA NortheasternArea State and Private Forestry. Center for Watershed Protection, Ellicott City, MD.• City of Davis Community Forest Management Plan , September 11, 2002.http://www.cityofdavis.org/pcs/trees/cfmp.cfm• City of Portland Stormwater Management Manual. Revision 3, September 1, 2004.• National Menu of Best Management Practices for Storm Water Phase II. United StateEnvironmental Protection Agency. 2002.http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm• Post-Construction Urban Runoff Management. City Council Policy. City of San Jose, California.February 3, 1998.• Start at the Source - Design Guidance Manual for Stormwater Quality Protection, Bay AreaStormwater Managemnt Agencies Association, 1999.• SMRC, The Stormwater Manager’s Resource Center. Manual Builder.http://www.stormwatercenter.net/Manual_Builder/Credits/SITE/reforestation.htm• Xiao Q., and E.G. McPherson. 2003. Rainfall interception by Santa Monica's municipal urbanforest. Urban Ecosystems• Xiao, Q., E.G. McPherson, S.L. Ustin and M.E. Grismer. 2000. A new approach to modeling treerainfall interception. 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.Photo CreditsAll photographs provided by Dena Parish and Shannon Brown, ECORP Consulting, Inc., Rocklin, CAStormwater Quality Design Manual for the Sacramento and South Placer RegionsINT-6 May 2007
Runoff Reduction Control Measure Fact SheetGreen RoofDescriptionPremier Automotive North American Headquarters, Irvine, CA.Photo: Roofscapes, Inc.A green roof is a multi-layered, vegetated rooftopsystem designed for filtering, absorbing, andretaining stormwater. Green roofs compriselightweight growth media and a specialized mixof vegetation underlain by a root barrier, adrainage layer, and a waterproofing membranethat protects the building structure. A green roofcaptures stormwater within the pore space of thegrowth medium and then releases the waterslowly via evaporation, transpiration anddischarge to the roof drains. There are two typesof green roofs—extensive (shallow growthmedia, simple vegetation) and intensive (deepergrowth media, complex vegetation).Siting Considerations• Space requirements; No additional space needed.• Land use: Most appropriate for commercial or multi-family land uses, particularly infilldevelopment and multi-story buildings in dense urban areas, parking garage and retail/warehouseroofs.Vector Considerations• Potential for mosquitoes due to standing water will be greatly reduced or eliminated if the greenroof is properly designed, constructed, and maintained.Advantages• Requires no additional land.• Improves outdoor air quality; aids in smog reduction.• Decreases roof and runoff temperature (heat island effect).• Provides insulation and lowers building cooling costs.• Protects underlying roof material from climatic extremes, ultraviolet light, and costlylong-term damage.• Can provide green space for building occupants to enjoy.• Provides habitat for wildlife, particularly birds.Limitations• Special structural design requirements to support green roof, irrigation needs and leak protectionelements (due to roof irrigation) are likely to increase building costs.• Erosion controls such as jute or cellulose netting and/or soil stabilizers will be required;additional controls such as cross-battens or steps may be required on sloped roofs.• General Maintenance Requirements (Moderate to High)• Irrigate to establish vegetation (first two years) and thereafter as needed.• Routinely inspect and maintain the roof membrane, drainage layer flow paths and irrigation system.• Repair eroded areas and replace vegetation as needed to maintain required cover.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007GR-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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Technical RequirementsSand FilterSa
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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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