what the value of runoff coefficient for gravel area (2% gradient)?
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NC-2009 SSc6.1: Stormwater Design—Quantity Control
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runoff coefficient
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Amy Rider
Sustainability ManagerKEMA Services
161 thumbs up
February 16, 2011 - 3:22 pm
While this is somewhat dependent on the design (material thickness, subgrade permeability, etc), 0.5 is a good rule of thumb for low slope gravel areas.