Difference between revisions of "Talk:Enhanced Grass Swale Design Guide"
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|colspan="2" style="color:red; text-align: left"| '''Swale | |colspan="2" style="color:red; text-align: left"| '''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 || || || || | | >= 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 || || || || | ||
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|colspan="2" style="color:red; text-align: left"| '''Max. Velocity | |colspan="2" style="color:red; text-align: left"| '''Max. Velocity for 25 mm Chicago Storm''' | ||
| 0.5 m/s || 0.5 m/s || 0.5 m/s || || || || || || || || || || | | 0.5 m/s || 0.5 m/s || 0.5 m/s || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"| '''Setback from | |colspan="2" style="color:red; text-align: left"| '''Setback from Building Foundation(m)''' | ||
| 4 || || 4 || || || || || || || || || || | | 4 || || 4 || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''(Impervious | |colspan="2" style="color:red; text-align: left"|'''(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 || | | 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 || | ||
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|colspan="2" style="color:red; text-align: left"|''' | |colspan="2" style="color:red; text-align: left"|'''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% || || || || || || || || || || | | (0.5-4.0)%,check dam for >3% || (0.5-4.0)%,check dam for >3% || (0.5-6.0) %, check dam for >3% || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''Bottom | |colspan="2" style="color:red; text-align: left"|'''Bottom Width (m)''' | ||
| 0.75-3.0 || 0.75-3.0 || 0.75-3.0 || || || || || || || || || || | | 0.75-3.0 || 0.75-3.0 || 0.75-3.0 || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''Flow | |colspan="2" style="color:red; text-align: left"|'''Flow Depth (mm) for (25 mm Chicago Storm Event)''' | ||
| max 100 | | max 100 || max 100 || max 100 || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''Side | |colspan="2" style="color:red; text-align: left"|'''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 || || || || || || || || || || | | 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 || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"| '''Soil Amendments''' | |colspan="2" style="color:red; text-align: left"| '''Soil Amendments''' | ||
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|colspan="2" style="color:black; text-align: right"| | |colspan="2" style="color:black; text-align: right"|Depth (mm) | ||
|300 || 300 || 300 || || || || || || || || || || | |300 || 300 || 300 || || || || || || || || || || | ||
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|colspan="2" style="color:black; text-align: right"|Oganic | |colspan="2" style="color:black; text-align: right"|Oganic Content | ||
|8-15% by weight || 8-15% by weight || 8-15% by weight || || || || || 3-15% || 5-10 % || || || || | |8-15% by weight || 8-15% by weight || 8-15% by weight || || || || || 3-15% || 5-10 % || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''Grass | |colspan="2" style="color:red; text-align: left"|'''Grass Height (mm)''' | ||
|75-150 || 150 || || || || || || || || || || || | |75-150 || 150 || || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''Gravel | |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) | ||
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|600 || || 600 || || || || || || || || || || | |600 || || 600 || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''Available | |colspan="2" style="color:red; text-align: left"|'''Available Space of the Contributing Drainage Area (%) ''' | ||
| 5-15 || || 5-15 || || || || || || || || || || | | 5-15 || || 5-15 || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''Depth between the | |colspan="2" style="color:red; text-align: left"|'''Depth between the Bottom of the Swale and High Water Table (m)''' | ||
|>= 1 || || >= 1 || || || || || || || || || || | |>= 1 || || >= 1 || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''Enhanced | |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 | |colspan="2" style="color:red; text-align: left"|'''Drainage Time of ponded water after the end of storm event (hr.)''' | ||
|< = 24 || || || || || || || || || || | |< = 24 || || || || || || || || || || | ||
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|colspan="2" style="color:red; text-align: left"|'''CDA or Impervious | |colspan="2" style="color:red; text-align: left"|'''CDA or Impervious Ratio''' | ||
|| || || || || || || || || < 5 acres || < 2.5 acres || || || | || || || || || || || || || < 5 acres || < 2.5 acres || || || | ||
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Revision as of 13:23, 18 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 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 |