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

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|75-150 || 150 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  
|75-150 || 150 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  
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|colspan="2" style="color:red; text-align: left"| '''Gravel diaphram'''                       
|colspan="2" style="color:red; text-align: left"|'''Gravel diaphram'''                       
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|colspan="2" style="color:black; text-align: right"| Diameter (mm)  
|colspan="2" style="color:black; text-align: right"| Diameter (mm)  
||  ||  ||  || 3-10 ||  || 3-10 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  
||  ||  ||  || 3-10 ||  || 3-10 ||  ||  ||  ||  ||  ||  ||
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|colspan="2" style="color:black; text-align: right"|Min. Wide (mm)  
|colspan="2" style="color:black; text-align: right"|Min. Wide (mm)  
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|colspan="2" style="color:red; text-align: left"|'''Enhanced grass swales area/contributing road surface'''   
|colspan="2" style="color:red; text-align: left"|'''Enhanced grass swales area/contributing road surface'''   
|1:1 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  
|1:1 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||
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|colspan="2" style="color:red; text-align: left"|'''Drainage time of ponded water after the end of storm event , hr'''  
|colspan="2" style="color:red; text-align: left"|'''Drainage time of ponded water after the end of storm event , hr'''  

Revision as of 19:18, 3 October 2017

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 4 hr. 25 mm(Chicago) 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) (25 mm Chicago storm event) max 100 (25 mm storm) max 100 (25 mm storm) max 100 (25 mm storm)
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