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Revision as of 13:42, 4 August 2022

Runoff coefficients for 5- to 10-year storms (Source: Haan et al., 1994)
Link to this table

Land use description Runoff coefficient (C)
Forest
< 5% slope 0.30
5 to 10% slope 0.35
> 10% slope 0.50
Open space
< 2% slope 0.05 to 0.10
2 to 7% slope 0.10 to 0.15
> 7% slope 0.15 to 0.20
Industrial 0.50 to 0.90
Residential
Multi-family 0.40 to 0.75
Single family 0.30 to 0.50
Impervious areas 0.70 to 0.95
Row crops1
< 5% slope 0.50
5 to 10% slope 0.60
> 10% slope 0.72
Pasture
N 5% slope 0.30
5 to 10% slope 0.36
> 10% slope 0.42

1For clay and silt loam soils.