A relook at NEH4 curve number data and antecedent moisture condition criteria Academic Article uri icon

abstract

  • This paper investigates the variation of the popular curve number (CN) values given in the National Engineering Hand Book-Section 4 (NEH-4) of the Soil Conservation Service (SCS) with antecedent moisture condition (AMC) and soil type. Using the volumetric concept, involving soil, water, and air, a significant condensation of the NEH-4 tables is achieved. This leads to a procedure for determination of CN for gauged as well as ungauged watersheds. The rainfall-runoff events derived from daily data of four Indian watersheds exhibited a power relation between the potential maximum retention or CN and the 5-day antecedent rainfall amount. Including this power relation, the SCS-CN method was modified. This modification also eliminates the problem of sudden jumps from one AMC level to the other. The runoff values predicted using the modified method and the existing method utilizing the NEH-4 AMC criteria yielded similar results. Copyright 2006 John Wiley & Sons, Ltd.

published proceedings

  • Hydrological Processes

author list (cited authors)

  • Mishra, S. K., & Singh, V. P.

citation count

  • 38

complete list of authors

  • Mishra, Surendra Kumar||Singh, Vijay P

publication date

  • August 2006

publisher