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|Surface roughness (Manning’s n)||Lower numbers indicate less surface obstruction and result in faster flow. Suggested range for 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>
|Surface roughness (Manning’s n)||Lower numbers indicate less surface obstruction and result in faster flow. Suggested range for 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%, consider using level spreaders to reduce erosion of the surface under high flow velocities.
|Surface slope (%)||If the slope > 3%, consider using [[level spreaders]] to reduce erosion of the surface under high flow velocities.
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!colspan = "2" style="background: darkcyan; color: white; align = center"|Soil (native underlying soil, or amended topsoil)
!colspan = "2" style="background: darkcyan; color: white; align = center"|Soil (native underlying soil, or amended topsoil)