Changes

|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:

* 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.</>

* 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>

* Rocks 0.03 – 0.05

* Rocks 0.03 – 0.05

* Planted (highly dependent on density) 0.05 – 0.15

* Planted (highly dependent on density) 0.05 – 0.15