Stormwater Source Control Design Guidelines 2005 - Waterbucket

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Stormwater Source Control Design Guidelines 2005Infiltration Rain Garden12. Avoid utility or other crossings of the Rain Garden. Whereutility trenches must be constructed crossing below thegarden, install trench dams to avoid infiltration waterfollowing the utility trench.13. Rain gardens can be constructed in a variety of shapes,including formal rectalinear flow-through planters(Drawing 3E). Get geotechnical advice prior to siting raingardens closer than 3m to building foundations.Design Options:Infiltration Rain Gardens may take a variety of shapes, frominformal, organically shaped ‘bowls’ to formal, rectilinearplanting areas and planters.Drain rock reservoir and underdrain may be deleted whereinfiltration tests by the design professional taken at the level ofthe base of the proposed construction show an infiltration ratethat exceeds the inflow rate for the design storm.Photo Credit: Lanarc Consultants Ltd.Flow-thru planter – a formal-shaped rain gardenthat provides water quality treatment and limitedflow attenuation – adapted to a near-buildinglocation at Buckman Terrace in Portland, Oregon.Greater Vancouver Sewerage & Drainage District45
Infiltration Rain Garden Stormwater Source Control Design Guidelines 2005Guideline SpecificationsMaterials shall meet Master Municipal Construction Document2000 requirements, and:1. Infiltration Drain Rock: clean round stone or crushed rock,75mm max, 38mm min, 40% porosity (Maryland Dept.Environmental Resource Programs, 2001).2. Pipe: PVC, DR 35, 150 mm min. dia., with cleanouts.3. Geosynthetics: as per Section 02498, select for filtercriteria or from approved local government product lists.4. Sand: Pit Run Sand as per Section 02226.5. Growing Medium: As per Section 02921 Topsoil andFinish Grading, Table 2, including the requirement forminimum saturated hydraulic conductivity of 2 cm/hr., withorganic matter requirements amended as follows:a. For lawn areas minimum 8%b. For planting areas minimum 15%6. Seeding: to Section 02933 Seeding or 02934 HydraulicSeeding (note – sodding will be required for erosioncontrol in most instances).7. Sodding: to Section 02938 Sodding.Construction Practices shall meet Master MunicipalConstruction Document 2000 requirements, and:1. Isolate the swale site from sedimentation duringconstruction, either by use of effective erosion andsediment control measures upstream, or by delaying theexcavation of 300mm of material over the final subgradeof the swale until after all sediment-producing constructionin the drainage area has been completed (Maryland Dept.Environmental Resource Programs, 2001).2. Prevent natural or fill soils from intermixing with theInfiltration Drain Rock. All contaminated stone aggregatemust be removed and replaced (Maryland Dept.Environmental Resource Programs, 2001).3. Infiltration Drain Rock shall be installed in 300mm lifts andcompacted to eliminate voids between the geotextile andsurrounding soils (Maryland Dept. Environmental ResourcePrograms, 2001).4. Maintain grass areas to mowed height between 50mmand 150mm., but not below the design water quality flowlevel. Landscape Maintenance standards shall be to theBC Landscape Standard, 6th Edition, Maintenance Level4: Open Space / Play.46Greater 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 39 and 40: Infiltration Swale Stormwater Sourc
Page 43 and 44: FLOWGROWING MEDIUMADJACENT GRADE200
Page 45 and 46: FLOWADJACENT GRADE200GROWING MEDIUM
Page 49: 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 ReferencesKey AuthorUnited Stat
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