CONTINUING EVOLUTION OF RAINFALL-RUNOFF AND THE CURVE NUMBER PRECEDENT

Ongoing development, user improvements, and new applications of the Curve Number method are described. The basics of the method are summarized and put into perspective, and recent findings and enhancements are summarized. Major issues of recent concern and attention are the initial abstraction ratio, Ia/S (or λ); land slope effects on CN; parameterization from field data; the use of small plot and infiltration data; aligning the CN method with process-based models; concern for the use of CNs with some forested watersheds; and departures from the original method. Based on this information, suggested topics for research, development, and investigation in rainfall-runoff processes- centered around CN procedures - are offered.

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