Reliability of SCS curve number method on semi-arid, reclaimed minelands
Titel:
Reliability of SCS curve number method on semi-arid, reclaimed minelands
Auteur:
Schroeder, S.A.
Verschenen in:
International journal of mining, reclamation and environment
Paginering:
Jaargang 8 (1994) nr. 2 pagina's 41-45
Jaar:
1994
Inhoud:
The USDA Soil Conservation Service (SCS) curve number (CN) method is a commonly used procedure for estimating runoff amounts from rainfall. This study was conducted to compare estimates of initial abstraction (Ia), maximum potential retention (S), and CN values from semi-arid, reclaimed mineland soils under various conditions using both the original SCS equations and the more commonly used equations in which Ia = 0.2S is assumed. Simulated rainfall was applied to 40 plots of reclaimed minelands of various textures, slopes, and basal cover. Values of Ia estimated from die field data were only 13% of S as compared to the assumed value of 20% in the SCS method. Generally the SCS method over-estimated Ia and CN while underestimating S when Ia was assumed to be 20% of S. Differences between the field-estimated and SCS-estimated Ia, S, and Cn values were significantly different from zero only for wet conditions due to decreased variability. Basal cover had a much greater influence on CN values for dry versus wet conditions: Results indicated that this methodology can be used on semi-arid, reclaimed minelands with a fairly high degree of reliability.
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