Changes

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|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'

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|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>

* [[Stones]] 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

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|Depth of filter media

|Depth of filter media

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|Porosity (fraction)

|Porosity of filter media

|Suggest range 0.35 – 0.4 unless otherwise tested

|Suggest [[Bioretention media storage|0.35]] unless otherwise tested

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|Field capacity (fraction)

|Field capacity (fraction)

|Suggested value 0.03 <ref name = SWMM/>

|Suggested value 0.03 <ref name = SWMM/>

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|Conductivity (mm/hr)

|Hydraulic conductivity (mm/hr)

|Suggested range 25 – 250 mm/hr

|Suggested range 25 – 250 mm/hr

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|Depth of storage aggregates layer

|Depth of storage aggregates layer

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|Void ratio

|Porosity of storage reservoir aggregate

|Suggest range 0.35 – 0.4 unless otherwise tested

|Suggest value 0.4 unless otherwise tested

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|Seepage rate (mm/hr)

|Seepage rate (mm/hr)

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|Clogging factor

|Clogging factor

|?

|Maybe up to 0.5 to account for some anticipated maturation.

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|Design drawdown time (hrs)

|Design [[drainage time]] (hrs)

|Also known as [['drainage time']]

|Maximum permissible time to fully drain the storage reservoir.

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!colspan = "2" align = center"|'''Drain (underdrain)'''

!colspan = "2" align = center"|'''Drain (underdrain)'''