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Latest revision as of 21:42, 18 March 2018

This page is an archive, please do not review, use or cite the contents below

LID Practice CANADA United States
Soakaways, Infiltration Trenches and Chambers CVC+TRCA (Factsheets-2010)[1] Toronto- 2016 LID-SWM Guide 2010[2] Massachusets SW BMP-2013 District of Columbia-SWM Guidebook-2010 W. Virginia-SWM design guidance manual-2012 Pennsylvania-City of Philadelphia green St. design manual-2014 Oregon SWM Manual-2014
Setback from Building Foundation (m) 4 4
(Impervious Drainage/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 LID type)
Natural Slope (%) < 15 < 15
A capped vertical standpipe, perforated installed to the bottom of the facility to monitor drainage time (mm) 100-150 100-150
Filter media
Stone Resvoir 1.5" to 3" stone dia., 2" pea gravel above 6" sand 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 sand below Stone 1.5"-3.5" Drain rock 3/4"-2.5 " washed open graded aggregate
Void Space(%) 30-40 30-40 30-40
Granular Material (clear stone)(mm) 50 50 50
Geotextile around the stone reservoir 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
Sand 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 rate equals < 15 mm/hr
Facilities receiving road runoff are not located within time of travel wellhead protection areas (years) 2 2