2,681
edits
Changes
Jump to navigation
Jump to search
Line 6:
Line 6: − + − + − + Line 21:
Line 21: − + − + − + Line 32:
Line 32: − + Line 46:
Line 46: − + − + − + − + − + − +
no edit summary
|-
|-
|width = 210px|Berm height (mm)
|width = 210px|Berm height (mm)
|Sometimes referred to as the bowl depth
|Ponding depth, maximum (e.g. 300 mm), sometimes referred to as 'bowl depth'
|-
|-
|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:
* [[Turf: List|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>
* [[Stone]]s 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
|-
|-
|-
|-
|Thickness (mm)
|Thickness (mm)
|Depth of [[filter media]]
|Depth of filter media
|-
|-
|Porosity (fraction)
|Porosity of filter media
|Suggest range 0.35 – 0.4 unless otherwise tested
|Suggest [[Bioretention media storage|0.35]] unless otherwise tested
|-
|-
|Field capacity (fraction)
|Field capacity (fraction)
|Suggested value 0.03 <ref name = SWMM/>
|Suggested value 0.03 <ref name = SWMM/>
|-
|-
|Conductivity (mm/hr)
|Hydraulic conductivity (mm/hr)
|Suggested range 25 – 250 mm/hr
|Suggested range 25 – 250 mm/hr
|-
|-
|Depth of storage aggregates layer
|Depth of storage aggregates layer
|-
|-
|Void ratio
|Porosity of storage reservoir aggregate
|Suggest range 0.35 – 0.4 unless otherwise tested
|Suggest value 0.4 unless otherwise tested
|-
|-
|Seepage rate (mm/hr)
|Seepage rate (mm/hr)
|Design infiltration rate of native soil
|Infiltration rate of native soil
|-
|-
|Clogging factor
|Clogging factor
|?
|Maybe up to 0.5 to account for some anticipated maturation.
|-
|-
|Design drawdown time (hrs)
|Design [[drainage time]] (hrs)
|Also known as [['drainage time']]
|Maximum permissible time to fully drain the storage reservoir.
|-
|-
!colspan = "2" align = center"|'''Drain (underdrain)'''
!colspan = "2" align = center"|'''Drain (underdrain)'''