Stormwater Source Control Design Guidelines 2005 - Waterbucket

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Stormwater Source Control Design Guidelines 2005Infiltration Trench and Soakaway Manhole5. Infiltration Trench: installation of perforated distributionpipe and bottom of drainrock to be level. If more than onesection of infiltration trench is required, design so thatunderground water is temporarily ‘ponded’ in eachinfiltration section, using underground weirs of undisturbednative material or constructed ditch blocks designed tocreate underground pooling in the reservoir sufficient forinfiltration performance.6. Infiltration Trench bottom width - 600mm minimum,2400mm maximum.7. Install the Infiltration Trench in native ground, and avoidover-compaction of the trench sides and bottom, whichreduces infiltration.8. Observation well for each Infiltration Trench (optional):vertical standpipe, with perforated sides, and locking lid,to allow the monitoring of water depth.9. Size the Infiltration Trench or Soakaway Manhole system bycontinuous flow modelling. For single family areas, checkwith local governments to see if there are sizing guidelinesfor your watershed or neighbourhood.10. A non-erodible outlet or spillway must be established todischarge overflow (Maryland Dept. EnvironmentalResource Programs, 2001).11. Avoid utility or other crossings of the Infiltration Trench.Where utility trenches must be constructed crossing belowthe Infiltration Trench, install trench dams to avoidinfiltration water following the utility trench.Photo Credit: Lanarc Consultants Ltd.Infiltration trench can be in any planshape – the photo shows a rectangular‘soakaway’ under construction at asingle family subdivision in BC.Soakaway Manhole System:1. Provide a report from a geotechnical engineer includingon-site test data of infiltration rates at the depth of theproposed infiltration. The bottom of the SoakawayManhole shall be at least 600mm above the seasonal highwater table or bedrock, or as recommended by theengineer.2. Provide a sedimentation manhole, and a maximum of twoSoakaway Manholes in series, unless otherwise approved.Minimum distance between Soakaway Manholes shall be8m.3. Provide an overflow from Soakaway Manhole to the stormdrainage system or major storm flow path.4. Size the Soakaway Manhole system by continuous flowmodelling.Greater Vancouver Sewerage & Drainage District77
Infiltration Trench and Soakaway Manhole Stormwater Source Control Design Guidelines 2005Guideline SpecificationsPhoto Credit: Lanarc Consultants Ltd.Infiltration trench with catch basininlet at Silver Maples Subdivision inMaple Ridge, prior to surface coverwith filter cloth and growingmedium.Materials 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, 100 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 over trench: As per Section 02921Topsoil and Finish Grading, Table 2.6. Seeding: to Section 02933 Seeding or 02934 HydraulicSeeding (note – sodding will be required for erosioncontrol in most swales, subject to the erosion controlprofessionals decision).7. Sodding: to Section 02938 Sodding.8. All precast sections shall conform to the requirements ofASTM C 478.9. Invert shall be level and smooth.10. Soakaway Manhole barrel shall not be perforated within1200mm of the cone.Construction Practices shall meet Master MunicipalConstruction Document 2000 requirements, and:1. Isolate the infiltration 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 subgradeuntil after all sediment-producing construction in thedrainage 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. Provide a min. of 150mm of 25mm or 19mm cleancrushed rock under all pipes.78Greater 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
Page 31 and 32: 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
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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: Infiltration Trench and Soakaway Ma
Page 85 and 86: 1 GRASS OR OTHER PLANTING2FINISH GR
Page 87 and 88: Design, Construction and Maintenanc
Page 125 and 126: 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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