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

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3 Steps to Managing Stormwater QualityThis chapter outlines steps to select and design stormwater quality features in orderto effectively incorporate stormwater management into site design and satisfy therequirements of the permitting agencies in Sacramento and South Placer Counties.Figure 3-1 illustrates the process. As you proceed through the process, record projectinformation and decisions and compile this information for submittal with theplanning application and/or post-construction stormwater quality plan, described inAppendix A. Check with the local permitting agency before you begin, since they mayrequire or recommend the use of special checklists, forms or formats for thesesubmittals.As explained in Chapter 2, developing optimal stormwater control strategies requiresthat stormwater be considered early in the site design process—before the site layoutis established. Otherwise, the choice/location of stormwater controls will beconstrained by prior site design decisions and it may not be possible to integratestormwater controls throughout the project design. See Chapter 2 for moreinformation about the integrated approach to effective stormwater management.The steps outlined in this chapter are presented in sequence, but steps 3 through 6are interrelated. Be sure to involve the engineers and other design professionals earlyduring the conceptual design stage using the collaborative team approach discussedin Chapter 2.Step 1: Gather Project and Site InformationStart by compiling information about the site and project. Some local developmentpermitting agencies (e.g., Sacramento County) will require this information to besubmitted with the initial planning application:• Project gross area (acres)• Proposed project net area (acres): this is the gross area minus protected openspace and planned parks• Proposed project density for residential projects (dwelling units per net area)• Existing and proposed impervious area (acres)• Name of watershed/receiving water and whether the project discharges directlyto this receiving water or first to the municipal storm drain system• Project category and associated potential pollutants, based on Table 3-1.Pollutant information will be used later to determine appropriate controlmeasures for your project.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007 3-1
Chapter 3Figure 3-1. Process for Addressing Stormwater Quality RequirementsSWQ = Stormwater QualityGatherProject & SiteInformationTable 3-1CompletePreliminary Designof SWQ FeaturesRecommendedPre-applicationmeetingDetermineRequirementsTable 3-2Submit preliminary designinformation withplanning applicationAppendix AEvaluate BestSWQ ApproachChapters2 & 3CompleteFinal Design ofSWQ FeaturesPermitting AgencyApproval/CommentsSelectSource ControlMeasuresTable 3-2 &Chapter 4Establish longterm maintenancerequirementsSubmit post-constructionstormwater quality planAppendix ASelect RunoffReduction Measures(if required or desired)Table 3-2 &Chapter 5Permitting AgencyApprovalCalculate RunoffReduction CreditsAppendix DConstructSWQ FeaturesInspection byPermitting AgencyNoProceedto Step 7Final Acceptance by Permitting Agency,Maintenance Agreement/Permitexecuted (if applicable)YesSelectTreatment ControlMeasuresTable 3-2 &Chapter 6SizeTreatment ControlMeasures Appendix E & Chapter 6Stormwater Quality Design Manual for the Sacramento and South Placer Regions3-2 May 2007
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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
Page 11 and 12: 1 IntroductionPurposeThis Stormwate
Page 13 and 14: IntroductionIn July 2003, the permi
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Runoff Reduction Control Measure Fa
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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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