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

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Chapter 1• County of Sacramento, Department of Water Resources (also representing theCities of Citrus Heights and Rancho Cordova)• City of Sacramento, Department of Utilities• City of Elk Grove, Department of Development Services/Public Works• City of Folsom, Department of Public Works• City of Galt, Department of Public Works• City of Roseville, Departments of Environmental Utilities and Public Works.In addition, the local vector control districts were consulted, since several types ofstormwater quality control measures could have the potential to support mosquitobreeding habitat, if not properly designed, constructed and maintained. Othercontributors included local sanitation districts, fire departments and districts andsolid waste interests.Using the ManualIntended AudienceThis manual is primarily intended for people involved in the design orreview/approval of development projects. Table 1-1 lists the different professionalswho typically should be involved at each phase of a project. It is important to involvemany different design professionals early in the planning process when the initial sitelayout is determined. It is equally important that those involved in site planning anddesign work collaboratively throughout the site design process; that way, stormwaterquality features can be optimally integrated into the site and project design. Benefitsof the collaborative team approach and strategies for involving everyone throughoutthe process are discussed more in Chapter 2.The manual also contains some information related to construction and maintenanceof stormwater quality facilities; therefore it may be used by contractors, inspectors,property owners and others as shown in Table 1-1.Finally, the manual may be used by developers, property owners, contractors, electedand appointed public agency officials, environmental regulatory agencies andinterested citizens.Projects Covered by the ManualTable 1-2 lists the types of projects and land uses generally addressed by this manual.If a project falls into one of those categories, see Table 3-2 (in Chapter 3) to see if theproject meets the size threshold that triggers the requirements and, if so, to seewhich specific requirements apply.Development projects potentially subject to this manual include both newdevelopment as well as "significant redevelopment" projects. Significantredevelopment includes, but is not limited to: expansion of a building footprint;replacement of a structure; replacement of impervious surface that is not part ofroutine maintenance activity; and land-disturbing activities related to structural orimpervious surfaces.Stormwater Quality Design Manual for the Sacramento and South Placer Regions1–4 May 2007
IntroductionFor redevelopment projects subject to this manual, the applicable design standardsapply only to the redeveloped area, and not to the entire site, except in cases whereuntreated drainage from the existing developed portion is allowed to enter/flowthrough the redeveloped portion. In such cases, any new required treatment controlmeasures must be designed for the entire contributing drainage area. Redevelopmentand infill project applicants should check with the local permitting agency at the startof project design to verify whether or not the manual requirements apply.Table 1-1.Applying the Design Manual to Every Phase of DevelopmentProject Phase Typical Decisions/Activities Professionals InvolvedInitial sitelayout andplanningBuilding and parking footprints; site access;preservation/integration of existing natural resourcefeatures (trees and other vegetation, creek buffers,wetlands, vernal pools, open space); use oftopographic lows for siting certain stormwater qualityfeatures; identification of existing sewer anddrainage facilities; preliminary on-site soils testing todetermine which stormwater quality features willwork on the siteArchitects; planners;environmental consultants;geotechnical and drainageengineers; landscapearchitects; and permittingagency planning andengineering staff (initialconsultations and preapplicationmeetings)SiteimprovementdesignBuilding designLandscape andirrigation designConstructionMaintenanceSite contouring and grading; on-site drainage andconnections to municipal system; other utilities(sanitary sewer, water, power); pavement selectionfor parking, roads and walkwaysFinal building footprint; building access; roof typeand materials; roof drainage/downspout system;location/type water features (e.g., ponds, waterfalls,fountains); location of landscaping around thebuilding (and possibly selection of vegetationtype/style to complement building design or provideconsistency with existing vegetation to be preservedon site or in the surrounding area)Final selection of type of trees and other vegetation;final contouring of landscaped areas; installation ofvegetation and bark/other ground cover materials;design and installation of irrigation system;construction of water featuresInstallation of stormwater quality facilities;installation of erosion and sediment control measuresto protect the facilities from receiving high sedimentloads during construction process; final clean-out andpreparation of stormwater facilities prior topermitting agency acceptanceBuilding, grounds and landscape maintenance, includingmaintenance of vegetated stormwater quality facilities(mowing, watering schedule, application of fertilizers,herbicides and insecticides, replacing/ repairingdamaged vegetation and eroded areas)Civil and other engineers;landscape architects;permitting agency planreview staff (drainageengineers, traffic, fire,etc.)Architects; civil/structural,geotechnical and otherengineers as appropriateLandscape architects,wetland specialists/biologists if applicableContractors; erosion controlspecialists; permittingagency inspectorsProperty owners andmanagers; maintenance andlandscape contractors;permitting agencymaintenance staffStormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007 1–5
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Page 5 and 6: Table of contentsOutdoor Work Areas
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Page 11 and 12: 1 IntroductionPurposeThis Stormwate
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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 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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