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

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Chapter 2Promote infiltration where feasibleOn undeveloped, undisturbed land, rain slowly percolates into the soil and impuritiesare filtered out and transformed through natural biological processes. Whendesigning a site, look for ways to promote infiltration and allow soil to filter andnaturally transform impurities. For example, consider dispersing runoff over alandscaped area. Of course, infiltration is not appropriate where it would pose athreat to groundwater quality or cause other problems such as destabilizing a site.Also consider infiltration stormwater quality treatment control measures for yoursite where feasible. Chapter 6 includes design information for two such devices: theinfiltration basin and infiltration trench.Minimize impervious surfacesFor all types of development, try to limit overall coverage of paving and roofs. Thiscan be accomplished—where consistent with local zoning regulations anddevelopment standards—by designing compact, taller structures, narrower andshorter streets and sidewalks, smaller parking lots (fewer/smaller stalls wherepossible, and more efficient lanes), and indoor or underground parking. Examine sitelayout and circulation patterns and identify areas where landscaping or planter boxescan be substituted for pavement.Where feasible, avoid draining impervious areas directly to a storm drainWhen the built and landscaped areas are defined on your site drawings, look foropportunities to minimize impervious areas that are directly connected to the stormdrain system. Chapter 5 presents information on several options that can beconsidered for this, including:• Direct runoff from impervious areas to adjacent pervious areas ordepressed landscaped areas.• Select porous pavements and surface treatments. Inventory paved areason the preliminary site plan and identify locations where permeable pavements,such as crushed aggregate, turf block, or unit pavers can be substituted forconventional concrete or asphalt paving. Typically, these materials work best inlow-traffic parking areas, rather than high-traffic areas such as drive aisles.Chapter 5 describes how to quantify the benefits achieved by your design decisions toreduce paved and roofed areas, to create landscaped areas and pervious pavementswhich retain water, and to direct runoff from impervious to pervious areas.Treat runoffTreating runoff is required for projects above certain size thresholds (which vary withrespect to project category and in some cases with respect to the jurisdiction-- seeTable 3-2). As previously noted, providing runoff reduction measures can reduce orpossibly even eliminate the required treatment.Treatment is accomplished by either detaining runoff long enough for pollutants tosettle out or by filtering runoff through sand or soil. Typically, the limiting designStormwater Quality Design Manual for the Sacramento and South Placer Regions2-6 May 2007
Integrated Approachfactors will be available space, available hydraulic head (difference in water surfaceelevation between inflow and outflow), and soil permeability. In some cases, a smalladjustment of elevations within the site plan can make a particular treatment optionfeasible and cost effective.When developing a drainage and treatment strategy, also consider whether to routemost or all drainage through a single detention and treatment control measure or todisperse smaller control measures throughout the site. Piping runoff to a singletreatment area may be simpler and easier to design, but designs that integratesmaller techniques such as swales, small landscaped areas, and planter boxesthroughout the site are typically more cost-effective, less maintenance intensive, andmore attractive. Chapter 6 describes various treatment control measures that areacceptable for use in the Sacramento and South Placer regions, such as:• Three types of water quality detention basins (dry, wet and combination)• Infiltration basin and trench• Sand filter• Stormwater planter (a type of bioretention facility)• Vegetated swale and filter stripReferences• Start at the Source: Design Guidance Manual for Stormwater QualityProtection, Bay Area Stormwater Management Agencies Association, 1999.http://www.scvurppp-w2k.com/basmaa_satsm.htm• Using Site Design Techniques to Meet Development Standards for StormwaterQuality: A Companion Document to Start at the Source, Bay Area StormwaterManagement Agencies Association, May 2003. http://www.scvurpppw2k.com/basmaa_satsm.htm• Low Impact Development Design Strategies: An Integrated Design Approach,Prince George’s County, Dept. of Environmental Resources, Maryland, June1999. http://www.epa.gov/owow/nps/lidnatl.pdf• California Storm Water Best Management Practice Handbook for Development,California Stormwater Quality Association, May 2003.Additional Resources• Stormwater Strategies: Community Responses to Runoff Pollution, Chapter 12 –Low Impact Development, Natural Resources Defense Council, October 2001.http://www.nrdc.org/water/pollution/storm/chap12.asp• Site Planning for Urban Stream Protection, Center for Watershed Protection(Tom Schueler), 1995.• Urban Small Sites Best Management Practice Manual, Barr Engineering forMetropolitan Council of Governments (Minneapolis/St. Paul).Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007 2-7
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Page 5 and 6: Table of contentsOutdoor Work Areas
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Page 9 and 10: Other Development Community Reviewe
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Page 13 and 14: IntroductionIn July 2003, the permi
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Runoff Reduction Control Measure Fa
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Runoff Reduction Fact SheetDisconne
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Chapter 6• What are pollutants of
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Chapter 6For projects using any of
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Runoff Treatment Control Measure Fa
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Design Data Summary SheetConstructe
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Technical RequirementsInfiltration
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Technical RequirementsSand FilterSa
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Technical RequirementsSand FilterTa
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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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