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

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Runoff Reduction Fact SheetDisconnected Roof DrainsDry Well(Check with local permitting agency for any local specifications before using this information).Dry Wells are similar to Dispersal Trenches except that the dimensions maybe different and theunderground structure may consist of a prefabricated or manufactured vault or box that may or may notbe filled with gravel. The dry well may be concrete or plastic (or other approved material), cylindrical orsquare, with perforations large enough to take full advantage of the infiltration capacity of thesurrounding soil.All design requirements related to pretreatment sumps, gutter protection, and overflows are the same asthose for Dispersal Trenches. See Figure DRD-2 for an example of the dry well design.These underground structures may be topped with geotextile fabric and 6 inches (or more depending onapproved specifications) of soil for planting.Figure DRD-2.Drywell – Typical Sections**Installation specifications may vary by siteand by local municipalityStormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007DRD-5
Runoff Reduction Fact SheetDisconnected Roof DrainsDesign CriteriaDesign criteria for disconnected roof drains and discharge variations are listed in Table DRD-2.Construction ConsiderationsSplash Block and Pop-up Drainage Emitter• Site must be graded to prevent ponding of water at base of building.• Splash blocks must be secured in place over compacted soil.• Roof drainage conveyance areas must be protected from erosion during vegetation establishmentperiod. Temporary measures such as erosion control blanketing may be used, however it may benecessary to bypass the stormwater around the conveyance zone during the stabilization period.Dispersal Trench and Dry Well• Do not allow soil below trench area to be compacted during construction.• The floor of the trench/well must be level to allow for spreading of flow across the trench.• To prevent sedimentation of the structure, the inlet pipe must be plugged until soil on the site isstabilized. To protect the structure during construction, provisions for sediment control must beincluded in the design.Long-term Maintenance RecommendationsTable DRD-3 presents inspection and maintenance recommendations for disconnected roof drains ingeneral and two design variations related to disconnected roof drains (dispersal trench and dry well). Thelocal permitting agencies require that the property owner be responsible for maintaining the features toensure continued, long-term performance. The pervious features should not be removed or replaced or allwater quality benefits will be lost. In general, a maintenance agreement will not be required for this typeof installation. However, developers are responsible for educating new homeowners that such devices areinstalled on their property and should be maintained following the recommendations provided in TableDRD-3. Where possible, such recommendations should be included in Covenants, Codes and Restrictionsfor new residential subdivisions.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsDRD-6 May 2007
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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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Page 35 and 36: Chapter 4Source Control Fact Sheets
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Runoff Treatment Control Measure Fa
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Technical RequirementsInfiltration
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Technical RequirementsSand FilterSa
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Technical RequirementsSand FilterDe
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Technical RequirementsSand FilterTa
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Technical RequirementsSand FilterLo
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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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