Line 6: |
Line 6: |
| |- | | |- |
| |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: |
− | * [[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 |
| |- | | |- |
Line 24: |
Line 24: |
| |- | | |- |
| |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) |
Line 47: |
Line 47: |
| |- | | |- |
| |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) |
Line 53: |
Line 53: |
| |- | | |- |
| |Clogging factor | | |Clogging factor |
− | |? | + | |Maybe up to 0.5 to account for some anticipated maturation. |
| |- | | |- |
| |Design drawdown time (hrs) | | |Design drawdown time (hrs) |