Talk:Soakaways, Infiltration Trenches and Infiltration Chambers Guide

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LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. Practice CANADA United States
Soakaways, Infiltration Trenches and Chambers CVCCredit Valley Conservation+TRCAToronto Region Conservation Authority (Factsheets-2010)[1] Toronto- 2016 LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.-SWMStormwater Management Guide 2010[2] Massachusets SW BMPBest management practice. State of the art methods or techniques used to manage the quantity and improve the quality of wet weather flow. BMPs include: source, conveyance and end-of-pipe controls.-2013 District of Columbia-SWMStormwater Management Guidebook-2010 W. Virginia-SWMStormwater Management design guidance manual-2012 Pennsylvania-City of Philadelphia green St. design manual-2014 Oregon SWMStormwater Management Manual-2014
Setback from Building Foundation (m) 4 4
(ImperviousA hard surface area (e.g., road, parking area or rooftop) that prevents or retards the infiltration of water into the soil. DrainageNatural or artificial means of intercepting and removing surface or subsurface water (usually by gravity)./Treatment) Area 5:1-20:1, 10:1 recommended 5:1-20:1, 10:1 recommended CDA < 5 acres CDA < 2 acres (T), < 5 acres (B) < 2 acres Max. load of 10:1 for infiltration systems (not specific to LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. type)
Natural Slope (%) < 15 < 15
A capped vertical standpipe, perforated installed to the bottom of the facility to monitor drainage timeThe period between the maximum water level and the minimum level (dry weather or antecedent level). (mm) 100-150 100-150
Filter media
Stone Resvoir 1.5" to 3" stone dia., 2" pea gravel above 6" sandMineral particles which are smaller than 2 mm, and which are free of appreciable quantities of clay and silt. Coarse sand usually designates sand grains with particle size between 0.2 and 0.02 mm. below 1.5"-3.5" stone dia. For stone layer, 3" layer of washed river stone, or No. 8 or 89 stone above, 6-8 " of sandMineral particles which are smaller than 2 mm, and which are free of appreciable quantities of clay and silt. Coarse sand usually designates sand grains with particle size between 0.2 and 0.02 mm. below Stone 1.5"-3.5" Drain rock 3/4"-2.5 " washed open graded aggregateA broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.
Void Space(%) 30-40 30-40 30-40
GranularGravel, or crushed stone of various size gradations (i.e., diameter), used in construction; void forming material used as bedding and runoff storage reservoirs and underdrains in stormwater infiltration practices. Material (clear stone)(mm) 50 50 50
GeotextileFilter fabric that is installed to separate dissimilar soils and provide runoff filtration and contaminant removal benefits while maintaining a suitable rate of flow; may be used to prevent fine-textured soil from entering a coarse granular bed, or to prevent coarse granular from being compressed into underlying finer-textured soils. around the stone reservoirAn underlying aggregate material bed that temporarily stores stormwater before infiltrating into the native soil or being conveyed by an underdrain pipe. with an overlap at the top (mm) min. 300 300 min. 300
Bottom Width of Excavations (mm) 600-2400 600-2400 600-2400
Minimum Depth of Excavations under concrete laneway (mm) 3000
Length of Time for Draining after Storm Event (>25mm) max. 72 hr. max. 72 hr., 48 hr. recommended
Depth to High Water Table (m) 1 1
SandMineral particles which are smaller than 2 mm, and which are free of appreciable quantities of clay and silt. Coarse sand usually designates sand grains with particle size between 0.2 and 0.02 mm. Layer Depth (mm) 150-300 Length of Time for Draining after Storm Event (>25mm)
Subdrains Inlet Pipes (mm) 100-200
Overflow is required when the infiltration rateThe rate at which stormwater percolates into the subsoil measured in inches per hour. equals < 15 mm/hr
Facilities receiving road runoffThat potion of the water precipitated onto a catchment area, which flows as surface discharge from the catchment area past a specified point.Water from rain, snow melt, or irrigation that flows over the land surface. are not located within time of travel wellhead protection areas (years) 2 2