FLOOD08379

• County: Statewide
• Community: State
• Stream Name: All
• Basin: Statewide
• Title: Procedures for Determining Peak Flows in Colorado
• Date: 3/1/1984
• Prepared For: State of Colorado
• Prepared By: USDA Soil Conservation Service
• Floodplain - Doc Type: Educational/Technical/Reference Information

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data points. Each graph then represented a curve number for average
antecedent soil moisture conditions (AMC II). This became the SCS curve
number data.

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Similar soil and vegetation conditions in the Arid West could very likely
have average antecedent soil moisture levels much lower than conditions
existing on those watersheds from which curve numbers were developed. In
such cases, runoff from a unit of rainfall would be much less from the arid
watersheds and resulting curve numbers would be lower. Therefore some
adjustment in curve numbers from published table values may be justified in
arid locations for antecedent moisture condition reasons.

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Curve number adjustments using Figure S-5 may be used in such locations with
approval of the State Conservation Engineer. A procedure for making
adjustments is discussed in Section 6, item G.

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