Stormwater Source Control Design Guidelines 2005 - Waterbucket

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Stormwater Source Control Design Guidelines 2005Pervious PavingPervious PavingDescriptionPervious paving is a surface layer of paving systems whichallows rainfall to percolate into an underlying reservoir base,where rainfall is stored and either exfiltrated to underlyingsubgrade, or removed by a subdrain.The surface component of pervious paving can be:- Porous asphalt or porous concrete, where fines are notincluded in the mix, providing a high void ratio thatallows water to pass through. There have beenproblems with surface clogging of this type of pavement.- Concrete or plastic grid pavers, where a structural loadbearing matrix has large voids that are filled with apermeable material – usually gravel or soil - and whichoften have grass in these voids.- Permeable unit pavers, made up of impervious concretemodular pavers with gapped joints that allow water topercolate between the pavers.The focus of this section is on the permeable unit pavers, asthey have been used with consistent success and appearmore resilient to clogging than porous paving alternatives.(James et al., 2003)Photo Credit: Lanarc Consultants Ltd.Plastic grid pavers in parking, White RockOperations Centre.Photo Credit: Lanarc Consultants Ltd.ApplicationSuitable for low traffic areas – e.g., driveways, parkingareas, storage yards, bike paths, walkways, recreationalvehicle pads, service roads, fire lanes (GVSDD, 1999).Can receive runoff from other areas, provided protectionfrom sediment loads is provided (GVSDD, 1999).Suitable for reduction in peak flows and runoff volumes,contaminant removal, groundwater recharge (GVSDD,1999).May be used to retrofit existing developments andredeveloping areas as well as new developments(GVSDD, 1999).Plastic grid paver detailGreater Vancouver Sewerage & Drainage District53
Pervious Paving Stormwater Source Control Design Guidelines 2005LimitationsA greater design and construction control effort is requiredwhen compared with impermeable pavements (Smith,2001).Minimum depth from base of drain rock reservoir to watertable or solid bedrock 610 mm (Smith, 2001).The pavement should be downslope from buildingfoundations, and the foundations should have pipeddrainage at the footing (Smith, 2001).At least 30m should be maintained between permeablepavements and water supply wells (Smith, 2001).Total catchment area draining onto the permeablepavement is not greater than 2 ha (Smith, 2001).To avoid surface plugging, it is critical to protect this BMPfrom sedimentation both during and after construction. Inaddition, identify pollutant sources, particularly inindustrial/commercial hotspots, that require pre-treatmentor source control upstream of this BMP (Maryland Dept.Environmental Resource Programs, 2001).For designs which rely on full exfiltration from the reservoirinto underlying soils, the infiltration rate of underlying soilshould be 12.5 mm/hr. minimum (Smith, 2001), or asdetermined by detailed geotechnical engineering.Types of permeable interlocking concrete pavements thathave wide joints (some manufacturers) should not be usedfor disabled persons parking stalls or pedestrian ramps atstreet crossings (Smith, 2001).Photo Credit: Lanarc Consultants Ltd.Permeable unit paving streetside parking in theNetherlands.54Greater 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
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 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: 1RAIN WATER LEADER OROTHER INLET4DA
Page 61 and 62: 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
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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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