Difference between revisions of "Talk:Enhanced Grass Swale Design Guide"

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Latest revision as of 21:39, 18 March 2018

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

LID Practice CANADA United States
Bioretention CVC+TRCA (Factsheets-2010)[1] Toronto- 2016 LID-SWM Guide 2010[2] 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 Tennessee-LID Development-SWM 2016 Texas-LID Technical Guidance Manual-2013 Oregon SWM Manual-2014 Oregon State Univ. Fact Sheets-2011
Swale Length between Culverts >= 5 >= 5 >= 5 Can amend with 2" of soil media or plant-derived compost to increase infiltration < 5 acres, capture runoff from 10-20% of the IPCDA, soil could also be 50/50 sand soil mix instead of bioretention media Compost amendments over full length and width
Max. Velocity for 25 mm Chicago Storm 0.5 m/s 0.5 m/s 0.5 m/s
Setback from Building Foundation(m) 4 4
(Impervious Drainage/Treatment) Area 5:1 to 10:1 5:1 to 10:1 CDA < 5 acres and WQV peak flow < 3 cfs CDA < 2.5 acres CDA <15000 ft2
Longitudinal Slope (0.5-4.0)%,check dam for >3% (0.5-4.0)%,check dam for >3% (0.5-6.0) %, check dam for >3%
Bottom Width (m) 0.75-3.0 0.75-3.0 0.75-3.0
Length >= contributing roadway length
Flow Depth (mm) for (25 mm Chicago Storm Event) max 100 max 100 max 100
Side Slope (H:V) Max. 2.5:1 , 4:1 where space permits Max. 2.5:1 , 4:1 is prefered Max. 2.5:1 , 4:1 where space permits
Soil Amendments
Depth (mm) 300 300 300
Oganic Content 8-15% by weight 8-15% by weight 8-15% by weight 3-15% 5-10 %
Grass Height (mm) 75-150 150
Gravel Diaphram
Diameter (mm) 3-10 3-10
Min. Wide (mm) 300 300
Min. Deep (mm) 600 600
Available Space of the Contributing Drainage Area (%) 5-15 5-15
Depth between the Bottom of the Swale and High Water Table (m) >= 1 >= 1
Enhanced Grass Swales Area/Contributing Road Surface 1:1
Drainage Time of ponded water after the end of storm event (hr.) < = 24
CDA or Impervious Ratio < 5 acres < 2.5 acres
Filter Media
Sand 50% 85-88% 70-85 % 66% 60%
Loam 50%
Soil Fines 8-12% 10-20% (silt), max. 10% (clay)
Organic 5-10 % > 5% otherwise amend 2" with media 33% 40%
CEC > 10 > 5
pH 5.5-7.5