Abstract

Researchers started to cross examine United States Department of Agriculture (USDA) Soil Conservation Services (SCS) Curve Number (CN) methodology after the technique produced inconsistent results throughout the world. More field data from recent decades were leaning against the assumption of the initial abstraction coefficient ratio value proposed by SCS in 1954. Physiographic conditions were identified as vital influencing factors to be considered under this methodology while practitioners of this method are encouraged to validate and derive regional specific relationship and employ the method with caution.

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