A. Shirmohammadi et al., EVALUATION OF CURVE NUMBER PROCEDURES TO PREDICT RUNOFF IN GLEAMS, Journal of the american water resources association, 33(5), 1997, pp. 1069-1076
Proper selection of curve number values will improve the capability of
the SCS-Curve Number procedure in predicting runoff. Both CREAMS and
GLEAMS models use the Smith and Williams (1980) approach of converting
CNII (curve number value for average antecedent moisture conditions)
into CNI (curve number value for dry antecedent moisture conditions) i
n calculating the soil retention parameter (S). CREAMS and GLEAMS have
been found to under predict runoff because of the internal conversion
of CNII to CNI. This study shows modifications of the GLEAMS model us
ing CNII without converting it to CNI and it also shows the seasonal c
urve number approaches with and without converting CNII to CNI. Result
s indicate that using CMI without internal conversion to CNI provides
better runoff and erosion predictions than the original version of GLE
AMS and versions with seasonal curve numbers when tested with four yea
rs of field data in the Coastal Plain physiographic region of Maryland
.