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{{Clickable button|[[File:TTT.png|450 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]}}
{{Clickable button|[[File:TTT.png|350 px|link=http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/]]}}
[[File:LID TTT.png|thumb|[[Bioretention cells]] are found within the LID toolbox]]
[[File:LID TTT.png|thumb|[[Bioretention cells]] are found within the LID toolbox]]
{|class="wikitable"
{|class="wikitable"
|-
|-
|width = 210px|Berm height (mm)
|width = 210px|Berm height (mm)
|Sometimes referred to as the bowl depth
|Sometimes referred to as the bowl depth or ponding depth (e.g. 300 mm)
|-
|-
|Surface roughness (Manning’s n)
|Surface roughness (Manning’s n)
|Lower numbers indicate less surface obstruction and result in faster flow
|Lower numbers indicate less surface obstruction and result in faster flow
Suggested ranges:
Suggested ranges:
* 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>
* [[Turf|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>
* Rocks 0.03 – 0.05
* [[Stone]] 0.03 – 0.05
* Planted (highly dependent on density) 0.05 – 0.15
* Planted (highly dependent on density) 0.05 – 0.15
|-
|-
|If the slope > 3% a series of [[Check dams]] or weirs should be included in the design.
|If the slope > 3% a series of [[Check dams]] or weirs should be included in the design.
|-
|-
!colspan = "2" style="background: darkcyan; color: white; align = center"|'''Soil (bioretention filter media)'''
!colspan = "2" align = center"|'''Soil (bioretention filter media)'''
|-
|-
|Thickness (mm)
|Thickness (mm)
|-
|-
|Porosity (fraction)
|Porosity (fraction)
|Suggest range 0.35 – 0.4 unless otherwise tested
|Suggest [[Bioretention media storage|0.4]] unless otherwise tested
|-
|-
|Field capacity (fraction)
|Field capacity (fraction)
|Suggested range 50 - 60 <ref name = SWMM/>
|Suggested range 50 - 60 <ref name = SWMM/>
|-
|-
!colspan = "2" style="background: darkcyan; color: white; align = center"|'''Storage'''
!colspan = "2" align = center"|'''Storage'''
|-
|-
|Thickness (mm)
|Thickness (mm)
|-
|-
|Void ratio
|Void ratio
|Suggest range 0.35 – 0.4 unless otherwise tested
|Suggest value 0.4 unless otherwise tested
|-
|-
|Seepage rate (mm/hr)
|Seepage rate (mm/hr)
|-
|-
|Clogging factor
|Clogging factor
|?
|Maybe up to 0.5 to account for some anticipated maturation.
|-
|-
|Design drawdown time (hrs)
|Design drawdown time (hrs)
|Recommend 48 hours?
|Also known as '[[drainage time]]'
|-
|-
!colspan = "2" style="background: darkcyan; color: white; align = center"|'''Drain (underdrain)'''
!colspan = "2" align = center"|'''Drain (underdrain)'''
|-
|-
|Flow coefficient
|Flow coefficient