Changes

{{Clickable button|[[File:TTT.png|400 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]}}

{{Clickable button|[[File:TTT.png|400 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]}}

[[File:Swale TTT.png|thumb|Swale element in TTT menu]]

[[File:Swale TTT.png|thumb|Swale element in TTT menu]]

[[File:Weir TTT.png|thumb|Weir elements may be incorporated as checkdams]]

[[File:Weir TTT.png|thumb|Weir elements may be incorporated as check dams]]

It is recommended that grass and [[enhanced grass swales]] be modelled using the 'Swale' element in the TTT. A 'swale' has to connect two existing elements within the TTT  

It is recommended that grass and [[enhanced grass swales]] be modelled using the 'Swale' element in the TTT. A 'swale' has to connect two existing elements within the TTT  

Suggested range for mown grass (dependent on density) 0.03 – 0.06 <ref name = SWMM> Oregon State Univ., Corvallis. Dept. of Civil, Construction and Environmental Engineering.; Environmental Protection Agency, Cincinnati ONRMRL. Storm Water Management Model Reference Manual Volume I Hydrology (Revised). 2016:233.https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100NYRA.txt  Accessed August 23, 2017.</ref>

Suggested range for mown grass (dependent on density) 0.03 – 0.06 <ref name = SWMM> Oregon State Univ., Corvallis. Dept. of Civil, Construction and Environmental Engineering.; Environmental Protection Agency, Cincinnati ONRMRL. Storm Water Management Model Reference Manual Volume I Hydrology (Revised). 2016:233.https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100NYRA.txt  Accessed August 23, 2017.</ref>

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|Surface slope (%)||If the slope > 3%, consider using small [[Checkdams]] or weirs to permit temporary ponding, increase infiltration, and slow flow to reduce erosion.   

|Surface slope (%)||If the slope > 3%, consider using small [[Check dams]] or weirs to permit temporary ponding, increase infiltration, and slow flow to reduce erosion.   

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|Swale side slopes (run/rise)||Suggested value of 3 or 4 if design permits [[Enhanced swales]]

|Swale side slopes (run/rise)||Suggested value of 3 or 4 if design permits [[Enhanced swales]]