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

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Runoff Reduction Control Measure Fact SheetPorous PavementFigure PP-2. ModularBlockPavement,TypicalSection*(Source: adaptedfrom Denver)*Installationspecificationsmay vary by site;check with localpermittingagencyWrap all geofabric or impermeable liners up the sidesto top of pavement. Secure firmly in place.Woven geotextile fabric meeting:ASTM D4751-AOS of 50-70ASTM D4633 min. trapezoidal tear strength 100 x 60 lbs.Minimum COE specified open area of 4%.When Type C soils are present and when infiltration is allowed,unless permeability tests show otherwise, use underdrains andgeotextile liner specified above.When the underlying soils are Type D or expansive, useunderdrains and 16 mil minimum thickness impermeable liner underand on sides of the pavement sand & gravel media basin.Reinforced Grass PavementReinforced grass pavement (Figure PP-3) consistsof an irrigated surface, typically stabilized with amanufactured product over which soil and seed mixis spread. Of the various porous pavement options,this may provide the greatest stormwater qualitybenefit due to its high permeability andevapotranspiration and nutrient uptake byvegetation. This pavement type is well suited inlow-traffic areas, such as overflow parking areas(stalls can be marked with athletic field paint) andmaintenance roads. (Source: NEMO). However, itis not suitable for fire access lanes. Load bearingcapacity varies by product, so select thereinforcement grid based on anticipated load.Because of the reinforcement, the area can be usedeven when the ground is saturated. Irrigation isrequired to maintain the vegetation. Refer to Table PP-1 for design criteria for this type of porouspavement.Other names: grid pavers, green parking, GrasspaveNew installation of reinforced grass pavement.Photo: Puget Sound Action Team, WAStormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007PP-7
Runoff Reduction Control Measure Fact SheetPorous PavementFigure PP-3. Reinforced Grass Pavement,Typical Sections*(Source: adapted from Denver)*Installation specifications may vary by site; check with localpermitting agencyVARIES10" MINIMUM OF COMPACTED SANDY GRAVEL **MIX OF 60% AGGREGATE AND 40% SANDTOP OF GRASS ROOT MASS1/4" ABOVE TOP OF RINGGRASSPAVEHYDROGROW MIX BELOW RING1" SAND10" MINIMUM OF WELL COMPACTED SANDY GRAVEL **1. INSTALL GRASS TURF REINFORCING LAYERPER MANUFACTURER'S RECOMMENDATIONSINCLUDE MODIFICATIONS SHOWN ON THIS DRAWING.2. DETAIL BASED ON INVISIBLE STRUCTURES, INC., ET AL DETAILS,BUT MODIFIED TO SUIT USDCM REQUIREMENTS.** GREATER DEPTH OF PAVEMENT MAY BEREQUIRED BY PAVEMENT DESIGNERStormwater Quality Design Manual for the Sacramento and South Placer RegionsPP-8 May 2007
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Stormwater Quality Design Manualfor
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Stormwater Quality Design Manual wa
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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
Page 11 and 12: 1 IntroductionPurposeThis Stormwate
Page 13 and 14: IntroductionIn July 2003, the permi
Page 15 and 16: IntroductionFor redevelopment proje
Page 17 and 18: Introduction• The Appendices prov
Page 19 and 20: 2 An Integrated Approach toEffectiv
Page 21 and 22: Integrated ApproachIt is also helpf
Page 23 and 24: Integrated ApproachPut landscaping
Page 25 and 26: Integrated Approachfactors will be
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Page 29 and 30: Chapter 3runoff reduction first (ev
Page 31 and 32: Chapter 3As the name implies (and a
Page 33 and 34: Chapter 3Step 9: Establish Long Ter
Page 35 and 36: Chapter 4Source Control Fact Sheets
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Page 51 and 52: 5 Runoff Reduction Control Measures
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Page 109 and 110: 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 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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