Talk:Bioretention Design Guide

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CANADA United States
Bioretention CVC+TRCA (Factsheets-2010) CVC-Construction Guide-2012 CVC-Retrofit Guide-2014 Toronto- 2016 LID-SWM Guide 2010 LID-Design Guide Edmonton- 2014 New York State SWM Design Manual-2015 Massachusets SW BMP-2013 District of Columbia-SWM Guidebook-2010 San Diego LID Handbook-2014 Alabama LID Handbook-2013 W. Virginia-SWM design guidance manual-2012 Rhode Island-SW design & Installation Standards Manual-2012 Pennsylvania-City of Philadelphia green St. design manual-2014 Minnesota SW Manual-2017 Tennessee-LID Development-SWM 2016 Texas-LID Technical Guidance Manual-2013 Oregon SWM Manual-2014 Oregon State Univ. Fact Sheets-2011
Filter media depth (m)
Depth 1-1.25 1-1.25 1-1.25 0.5-1.0 >= 2.5 ft.
Composition Topsoil 30-50% 20-30 % 8-20 % Table 1 & 2 (below)
sand 85-88 % Fine sand=0-17%, Coarse to medium sand=71-92 % 85-88 % 85-88 % 85-88 % 50-85 % 50-70 40% 85-88 % 65% sand, 20% sand loam 85-88 % 70-88 % 85-88 % 50-80 % 70-85 % (sandy loam) 85-88 % 66% 60% (sandy loam)
Fines(silt and clay) 8-12 % 8-12 % 8-12 % 7-12 % 8-12 % 10-15% (silt),3-10% (clay), both combined, max 20% clay < 5% 8-12 % 8-12 % 0-12 % silt, 0-2 % clay Silt 40% , Clay 10% 10-20% (silt), max. 10% (clay) 8-12 %
gravel 15%
Organic matter 3-5 % 3-5 % 3-5 % 3-5 % 3-5 % 5-10% 5% 30-40 % 1-5 % 2-5 % 3-15 % 3-5 % 3-5 % 2-10 % 5-10 % 2-5 % 33% 40%
P-index value 10-30 ppm 12-30 ppm 10-30 ppm 10-30 < 15
Soluble salts < 2.0 mmhos/cm
Cationic exchange capacity > 10 meq/100 g 10 meq/100 g > 10 meq/100 g > 10 meq/100 g > 10 meq/100 g > 5 meq/100 g > 10 > 5 > 10 > 10 > 5
pH 5.5-7.5 5.5-7.5 5.5-7.5 5.5-7.5 5.5-7.5 5.5-7.5 6-8 6-7 6-8.5 (WQ blend) 6-8 5.5-7.5
Phosphorus 10-30 ppm Table 1 & 2 (below)
Infiltration rate > 25 mm/hr > 25 mm/hr > 25 mm/hr > 25 mm/hr
Surface resistance <= 110 PSI
Sub-surface resistance <= 260 PSI
Saturated hydraulic conductivity , mm/hr 25 min.
P-Content 10-30 < 15 ppm 7-23 mg/kg
Compost (optional) 15-25% 15%
Gravel storage
Void space ratio 0.4 0.4
Depth min. 300 mm min. 300 mm min. 300 mm
Diameter(clear stone) 50 mm 50 mm 50 mm
Pea gravel choking layer depth (mm) 100 100 100
diameter (mm) 3-10 3-10
Mulch
Depth 75 mm <=75 mm 75 mm 75 mm 70-80
Overflow
Overflow invert above the filter bed surface 150-250 <= 250 mm
Monitoring well
Vertical perforated pipe diameter 100-150 mm 100-150 mm 100-150 mm 100-150 mm
Underdrain
Required when infiltration rate < 15 mm/hr < 15 mm/hr < 13 mm/hr
Diameter min. 100 mm(200 mm recommended) min. 100 mm, 200 mm is recommended min. 200 mm min. 100 mm(200 mm recommended) 200 mm 4 inches
Depth above the gravel storage layer 100 mm 100 mm
Available head beween the inflow point 1-1.5 m 1-1.5 m Typical CDA 0.1-2.5 acres of 100% IP(<0.5 no underdrain), alternative to checking layer is needle punched non-woven geotextile
and the downstream stream drain invert
Contributing drainage area Typical 100 m2 to 0.5 hectare 100 m2 to 0.5 hectare 0.5-2 acres preferred, max 5 acres, BR min. size 200 ft2 5 acres
Maximum recommended 0.8 hectare 0.8 hectare
Setback from building Foundation(m) 4 4 4 3 (clay), 5 (heavy clay) see table 3 below
(Impervious drainage/treatment facility) area 5:1 to 15:1 5:1 to 15:1 5:1 to 15:1 < 5:1 loading ratio (DA to IA, DA 100% IP) SA of BR 3 to 6% of CDA sized at 5-8 % of IPCDA BR SA 3-6% of CDA CDA < 5 acres CDA < 2.5 acres CDA < 5 acres BR SA: 6-15 % of IP area
Contributing Slope (%) 1-5 1-5 >1 % and < 33%
Slope of the surface, % <= 1%
Water table depth min. 1.0 m min. 1.0 m > 1.8 3 ft.
Outlet min. 100 mm above the bottom of the facility Difference in elevation between inflow and outflow =4-6 ft (when underdrain is used)
Maximum ponding depth above the filter bed surface 150-250 mm 250 mm 150-250 mm 350 mm 18 inch
Facilties receiving road runoff are not located within time of travel 2 2
wellhead protection areas, year
Drainage time of ponded water after the end of storm event , hr 24 (48 recommd.) < 48 (2 yr. design) Max. 48 hr.
Inlet design for non-point source-grass filter buffer, m 0.5-3.0
Surface area/Contributing drainage area, % 10-20 % 10-20 % 3.0-30 % (5-10)%- min. 200 ft2
Contributing impervious area < 4.0 ha. ` < 15000 ft2
Facility flow velocity < 0.3 m/s-planted area <= 1 ft/sec, tree-shurb-mulch cell
< 0.9 m/s- mulched zone <= 3 ft/sec , grassed cell
Discharge velocity (outlet point) < 4 ft/sec
Side slope (H:V) 4:1 preferred(max 2:1) 3:1 (H:V)
Surface geometery (length/width) 2:1
Infiltration trench (optional)
Depth, m 0.5-1.0
Width, m 1.0-6.0
Bottom slope, % 0
C/N Ratio 12:1-25:1