Stormwater Source Control Design Guidelines 2005 - Waterbucket

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Stormwater Source Control Design Guidelines 2005Absorbent LandscapeDesign GuidelinesPhoto Credit: Lanarc Consultants Ltd.1. Maximize the area of absorbent landscape – eitherexisting or constructed – on the site.2. Conserve as much natural forest land, existingtrees and undisturbed soil as is compatible with theproject. Provide temporary fencing of theseprotected areas during construction.3. Minimize impervious area through such techniquesas multi-storey buildings, narrower roads,minimum parking, larger landscape areas, greenroof, and pervious paving.4. Disconnect impervious areas from the storm sewersystem, having them drain to absorbent landscapewith only an overflow to the storm drainagesystem.Drainage from parking area to landscape.5. Design absorbent landscape areas as gentlysloping (2%) or dished (concave) areas thattemporarily store stormwater and allow it to soak in(maximum ponding time of 2 days), with overflow onlyoccurring in large rain events.6. When planting, maximize the vegetation canopy coverover the site. Cover by multi-layered evergreen trees andshrubs is ideal, but deciduous tree cover also is beneficialfor stormwater management.7. Use native planting species where feasible. Non-nativeplantings with similar attributes to native may be suitable inconditions where natives would grow too large or not meetother urban design objectives.8. Ensure adequate growing medium depth for bothhorticultural and stormwater needs – generally a minimumof 150mm depth for lawn areas, and 450mm depth forshrub/tree areas. In wetter areas of the GVRD near themountains with till subsoils, a minimum growing mediumdepth of 300mm for lawn areas is required to store 60mmof rainfall.9. Test growing medium for physical and chemical properties,and amend it to provide approximately 8% organic matterfor lawns, and 15% organic matter for planting beds, inthe upper 200mm of growing medium.10. Do not over-compact landscape subgrade or growingmedium. Optimum compaction is firm against deepfootprints (about 80% Proctor Density). Excessivecompaction reduces infiltration rates. Rip or till subsoilsthat are excessively compacted. Aerate compacted surfacesoils.Greater Vancouver Sewarage & Drainage District31
Absorbent Landscape Stormwater Source Control Design Guidelines 200511. Scarify subgrade surfaces prior to placing growingmedium, and rototill through layers of growing medium tocreate a transition in soil texture rather than discrete soillayers. Do not install soils in layers of different textures, asthis can create barriers to infiltration.12. Provide vegetative cover (grass, groundcovers, shrubs,trees) or organic cover (mulch, straw, wood fibre) toabsorbent landscape as early as possible in theconstruction process, and prior to winter storms, to avoidsurface crusting from raindrop impact and to maintainsurface permeability.13. Provide effective erosion control during construction,including erosion control on upstream sites that may flowinto the absorbent landscape. Delay installation ofconstructed absorbent landscape until sources of potentialerosion in the upstream drainage area have beenpermanently stabilized.Photo Credit: Lanarc Consultants Ltd.Guideline SpecificationsMaterials and methods shall meet Master MunicipalConstruction Document 2000 requirements, including theSection 02921 requirements for Growing Medium, withorganic matter requirements amended as follows:For lawn areas minimum 8%For planting areas minimum 15%Straw laid on surface to preventerosion and crusting from raindropimpact.32Greater Vancouver Sewerage & Drainage District
Page 1 and 2: Stormwater Source ControlDesign Gui
Page 3 and 4: Contents Stormwater Source Control
Page 5 and 6: Acknowledgements Stormwater Source
Page 7 and 8: Introduction Stormwater Source Cont
Page 13 and 14: Summary Posters Stormwater Source C
Page 15 and 16: DESIGN PRINCIPLES■ Maximize the a
Page 17 and 18: DESIGN PRINCIPLES■ Literature sug
Page 19 and 20: DESIGN PRINCIPLES■ Suitable for f
Page 23 and 24: Rainwater Source Control Around the
Page 29 and 30: Absorbent Landscape Stormwater Sour
Page 35: Absorbent Landscape Stormwater Sour
Page 39 and 40: Infiltration Swale Stormwater Sourc
Page 43 and 44: FLOWGROWING MEDIUMADJACENT GRADE200
Page 45 and 46: FLOWADJACENT GRADE200GROWING MEDIUM
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
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Design, Construction and Maintenanc
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Candidate Plant List Stormwater Sou
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Glossary Stormwater Source Control
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Glossary Stormwater Source Control
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Stormwater Source Control Design Gu
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Key ContactsLast revised 11 April 2
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Key ContactsLast revised 11 April 2
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Key ReferencesKey AuthorBarry, K.,
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Key ReferencesKey AuthorDeutsche Ve
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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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