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

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DisclaimerThe Sacramento/South Placer Counties Design Manual should be used as a generalguidance document to aid with the selection, siting, design, operation and long-termmaintenance of stormwater quality control measures. The control measuresdescribed herein are intended to serve as best management practices (BMPs)implemented to meet the standard of “reducing pollutants in urban runoff to themaximum extent practicable” set forth in the local agencies’ NPDES MunicipalStormwater Permits issued by the Central Valley Regional Water Quality ControlBoard.The stormwater quality control measures should be designed using the criteriaoutlined in this manual and implemented at areas of new development andredevelopment in accordance with the policies and procedures of the local permittingagency. The control measures must be properly constructed and maintained toensure long-term performance. Other measures not included in this manual may beallowed on a case-by-case basis, in consultation with the applicable permittingagency. In such cases, the applicant is encouraged to meet with permitting agencystaff early in the planning process before proceeding with detailed design. Suchprojects may require additional time for agency review and approval.The contributing agencies do not claim any responsibility for errors or omissions inthis design manual, improper design, or ineffective maintenance practices that mightcontribute to non-performance of the stormwater quality control measures. Theagencies will share the responsibility of verifying that publicly owned and maintainedtreatment controls are constructed properly; however, private controls are theowners’/applicants’ responsibility.Most of the control measures described in this manual should be designed by, orunder the supervision of, a California licensed professional engineer and/or otherspecialists as needed, depending on the type of control measure and site conditions.Check with the local permitting agency to verify the license requirement for thedesign project undertaken.The science of stormwater quality management is evolving and new and innovativecontrol measure technologies are constantly being introduced to designprofessionals. For this reason, this manual will need to be a dynamic document thatwill be reviewed and updated periodically. Manual users are responsible for ensuringthat they are referencing the most current edition, by checkingwww.sacramentostormwater.org (new development) or contacting their localpermitting agency.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007vii
1 IntroductionPurposeThis Stormwater Quality Design Manual forthe Sacramento and South Placer Regions(manual) outlines planning tools andrequirements to reduce urban runoffpollution to the maximum extent practicable(MEP) from new development andredevelopment projects.This manual is a collaborative effort of theSacramento Stormwater Quality Partnership 1and the City of Roseville, and it is intendedto satisfy the regulatory requirements oftheir respective municipal stormwaterpermits. (See the section BackgroundInformation later in this chapter for more about the Partnership and permitrequirements.)GoalsThe Sacramento and Rosevillepermitting agencies have thefollowing goals for this manual:• Protect the quality of our localcreeks and rivers.• Consolidate all stormwaterquality design requirementsinto one document.• Provide a consistent set ofrequirements for stormwaterquality management thatapply in the urbanized part ofSacramento County and theThis Design ManualThis comprehensive manualoutlines a consistent set ofstormwater quality managementdesign standards for many new andredevelopment projects in theurbanized parts of SacramentoCounty and the City of Roseville. Itprovides planning and design toolsfor use by planners, architects,landscape architects, engineersand environmental professionals.The stormwater quality development standardsare intended to protect our valuable creek andriver resources for future generations.City of Roseville. That is intended to facilitate better areawide compliance withclean water laws.1 The Sacramento Stormwater Quality Partnership includes the County of Sacramento and the Cities of CitrusHeights, Elk Grove, Folsom, Galt, Rancho Cordova and Sacramento. For more information, see the Glossary.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007 1–1
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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 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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