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Water 2015, 7(3), 939-955; doi:10.3390/w7030939

Estimation of CN Parameter for Small Agricultural Watersheds Using Asymptotic Functions

1
Department of Land Reclamation and Environmental Development, University of Agriculture in Krakow, St. Mickiewicza 24-28, Krakow 30-050, Poland
2
Department of Sanitary Engineering and Water Management, University of Agriculture in Krakow, St. Mickiewicza 24-28, Krakow 30-058, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Richard Smardon
Received: 26 January 2015 / Revised: 16 February 2015 / Accepted: 2 March 2015 / Published: 10 March 2015
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Abstract

This paper investigates a possibility of using asymptotic functions to determine the value of curve number (CN) parameter as a function of rainfall in small agricultural watersheds. It also compares the actually calculated CN with its values provided in the Soil Conservation Service (SCS) National Engineering Handbook Section 4: Hydrology (NEH-4) and Technical Release 20 (TR-20). The analysis showed that empirical CN values presented in the National Engineering Handbook tables differed from the actually observed values. Calculations revealed a strong correlation between the observed CN and precipitation (P). In three of the analyzed watersheds, a typical pattern of the observed CN stabilization during abundant precipitation was perceived. It was found that Model 2, based on a kinetics equation, most effectively described the P-CN relationship. In most cases, the observed CN in the investigated watersheds was similar to the empirical CN, corresponding to average moisture conditions set out by NEH-4. Model 2 also provided the greatest stability of CN at 90% sampled event rainfall. View Full-Text
Keywords: agricultural watershed; rainfall-runoff model; CN parameter; asymptotic equation; SCS method agricultural watershed; rainfall-runoff model; CN parameter; asymptotic equation; SCS method
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kowalik, T.; Walega, A. Estimation of CN Parameter for Small Agricultural Watersheds Using Asymptotic Functions. Water 2015, 7, 939-955.

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