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Usefulness of the Modified NRCS-CN Method for the Assessment of Direct Runoff in a Mountain Catchment

Wałęga A., Rutkowska A.

Acta Geophysica

2015

Vol. 63, no. 5

1423--1446

The aim of this study was to evaluate the usefulness of modified methods, developed on the basis of NRCS-CN method, in determining the size of an effective rainfall (direct runoff). The analyses were performed for the mountain catchment of the Kamienica river, right-hand tributary of the Dunajec. The amount of direct runoff was calculated using the following methods: (1) Original NRCS-CN model, (2) Mishra- Singh model (MS model), (3) Sahu-Mishra-Eldho model (SME model), (4) Sahu 1-p model, (5) Sahu 3-p model, and (6) Q_base model. The study results indicated that the amount of direct runoff, determined on the basis of the original NRCS-CN method, may differ significantly from the actually observed values. The best results were achieved when the direct runoff was determined using the SME and Sahu 3-p model.

SCS-CN method. Part II: Analytical treatment

Mishra S., Singh V.

Acta Geophysica Polonica

2003

Vol. 51, nr 1

107-123

This part of the paper, a sequel to Part I, in continuation of the analytical treatment of the Soil Conservation Service curve number (SCS-CN) method, further explores the SCS-CN method for: Z(a) its functional behaviour, (b) the physical interpretation of its proportional equality and curve number, (c) the derivation of seldom explored potential macimum retention S-CN relation, and (d) the development of CN-antecedent moisture condition (AMC) relations. Finally, an attempt is made to present the SCS-CN concept as a viable alternative to power law.