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|Surface roughness (Manning’s n)||Lower numbers indicate less surface obstruction and result in faster flow. <br>
|Surface roughness (Manning’s n)||Lower numbers indicate less surface obstruction and result in faster flow. <br>
Suggested range for [[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>
Suggested range for [[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>
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|Surface slope (%)||If the slope > 3%, use [[Check dams]] to create temporary ponding, increase infiltration, and slow flow to reduce erosion.
|Surface slope (%)||If the slope > 3%, use [[Check dams]] to create temporary ponding, increase infiltration, and slow flow to reduce erosion.