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Download scientific diagram | Comparison of the curve number (CN) values according to National Engineering Handbook (NEH) with simu- lated rainfall forPart 630. National Engineering Handbook. Hydrologic Soil-Cover Complexes. Chapter 9. Table 9–1. Runoff curve numbers for agricultural lands 1/ — Continued. RUNOFF CURVE NUMBER METHOD: BEYOND THE HANDBOOK. Joseph A. Van Mullem, Hydraulic Engineer, USDA, NRCS, (retired) Bozeman, MT. Donald E. Woodward, National The runoff curve number procedure uses certain climatic data and the characteristics of a watershed to convert rainfall data to runoff vol- me. This procedure The curve number method estimates this combined direct runoff. 10-2. Part 630. National Engineering Handbook. 630.1001 Rainfall-runoff. ABSTRACT: The Soil Conservation Service Curve Number (SCS-CN) is a well-established loss-rate model to estimate runoff. It combines watershed parameters and