Stormwater Source Control Design Guidelines 2005 - Waterbucket

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Stormwater Source Control Design Guidelines 2005Design, Construction and Maintenance ProcessImpervious Paving% of Rainfall Capture Target0%Impervious Roof% of Rainfall Capture Target0%Pervious Paving% of Rainfall Capture Target33%Rainwater Storage% of Rainfall Capture Target0%Infiltration Swale% of Rainfall Capture Target66%Rain Gardens% of Rainfall Capture Target100%OverflowTo Detention or OutfallOverflowTo Detention or OutfallFigure F3: Alternative Stormwater Treatment Chain for Low DensityDevelopmentGreater Vancouver Sewerage & Drainage District95
Design, Construction and Maintenance Process Stormwater Source Control Design Guidelines 2005Conceptual Sizing and Space Allocation forStormwater Source ControlsPrior to a conceptual Stormwater Source Control TreatmentChain being finalized, it is important to identify, at the conceptlevel, the approximate size and location for stormwater sourcecontrols.The amount of space required for stormwater source controlsis a direct function of:− The volume and intensity of rainfall hitting the site, andthe associated rainfall capture target.− The amount of impervious area on the site.− The area of infiltration surface on the site.− The rate of infiltration into the infiltration surface.− The amount of rainfall storage that can be provided totemporarily hold water until it can infiltrate into theground.To prepare a gross initial approximation of the space neededfor stormwater source control, try the following steps:1. Disturbed pervious areas should be replaced withadequate soil layers to capture the rainfall target. Thetarget is calculated by taking 72% of the 2-year, 24-hourrainfall depth from the nearest climate station IDF curve.Determine the required soil layer depth for absorbentlandscapes by assuming a reasonable void space in thesoil layer. E.g. Surrey Kwantlen Park climate station 2-year, 24-hour rainfall depth = 54.5 mm. 72% of 54.5 =39 mm. Soil layer required with 0.2 void space = 200mm.2. Calculate the impervious area of the site. Minimize thisnumber by providing absorbent landscape, perviouspaving, or by hydraulic disconnects – where smallimpervious surfaces drain into large absorbent landscapes(size soil layer to accommodate impervious runoff), therebynot creating runoff.3. Using the rainfall capture target, calculate the volume ofrainfall that must be infiltrated or reused on the site, incubic metres (impervious area x rainfall capture target).(e.g. Surrey Kwantlen Park rainfall target is 39 mm ximpervious area = capture volume.)4. Determine surface area, soil layer depth, and rockreservoir depth (if needed) required for selected sourcecontrols to achieve the capture volume target. Account forinfiltration using the on-site tested infiltration rate96Greater Vancouver Sewerage & Drainage District
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Stormwater Source ControlDesign Gui
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Contents Stormwater Source Control
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Acknowledgements Stormwater Source
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Introduction Stormwater Source Cont
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Summary Posters Stormwater Source C
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DESIGN PRINCIPLES■ Maximize the a
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DESIGN PRINCIPLES■ Literature sug
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DESIGN PRINCIPLES■ Suitable for f
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Rainwater Source Control Around the
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Absorbent Landscape Stormwater Sour
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Infiltration Swale Stormwater Sourc
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FLOWGROWING MEDIUMADJACENT GRADE200
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FLOWADJACENT GRADE200GROWING MEDIUM
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Page 49 and 50: Infiltration Rain Garden Stormwater
Page 51 and 52: Infiltration Rain Garden Stormwater
Page 53 and 54: 12345678910TREE, SHRUB ANDGROUNDCOV
Page 55 and 56: 1123456789101112TREE, SHRUB ANDGROU
Page 57 and 58: 1RAIN WATER LEADER OROTHER INLET4DA
Page 59 and 60: Pervious Paving Stormwater Source C
Page 65 and 66: 1PERMEABLE PAVERS (MIN. 80mm THICKN
Page 69 and 70: Green Roof Stormwater Source Contro
Page 77 and 78: 1WALL CAP FLASHING9WATERPROOF MEMBR
Page 81 and 82: Infiltration Trench and Soakaway Ma
Page 83 and 84: Infiltration Trench and Soakaway Ma
Page 85 and 86: 1 GRASS OR OTHER PLANTING2FINISH GR
Page 87 and 88: Design, Construction and Maintenanc
Page 99: Design, Construction and Maintenanc
Page 125 and 126: Candidate Plant List Stormwater Sou
Page 133 and 134: Glossary Stormwater Source Control
Page 135 and 136: Glossary Stormwater Source Control
Page 137 and 138: Stormwater Source Control Design Gu
Page 139 and 140: Key ContactsLast revised 11 April 2
Page 141 and 142: Key ContactsLast revised 11 April 2
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Page 145 and 146: Key ReferencesKey AuthorBarry, K.,
Page 147 and 148: Key ReferencesKey AuthorDeutsche Ve
Page 149 and 150: Key ReferencesKey AuthorHorner, R.R
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Key ReferencesKey AuthorLower Hunte
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Key ReferencesLast revised 11 April
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Key ReferencesLast revised 11 April
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Key ReferencesKey AuthorUnited Stat
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Stormwater Source Control Design Gu
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