Talk:Soakaways, Infiltration Trenches and Infiltration Chambers Guide

From LID SWM Planning and Design Guide
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Soakaways, Infiltration Trenches and Chambers CVC+TRCA Toronto- 2016 LID-SWM Guide 2010 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
Factsheets-2010
Setback from building Foundation(m) 4 4 Max. load of 10:1 for infiltration systems (not specific to LID type)
(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 CDA: max. 15000 ft2
Natural Slope (%) < 15 < 15
A capped vertical sandpipe, perfored instaled to 100-150 mm 100-150 mm
the bottom of the facility to monitor drainage time
Filter Mdia 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 min. 300 mm 300 min. 300 mm
with an overlap at the top
Bottom widh 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 recommended
Depth to high water table (m) 1 1
Sand layer depth (mm) 150-300
Subdrains Inlet pipes (mm) 100-200
Overflow ( if infiltration rate ) < 15 mm/hr
Facilties reciving road runoff are not located within time of travel 2 2
wellhead protection areas, year