Abstract
AbstractDependency of rational formula runoff coefficients on return period for two locations in Texas is evaluated by making use of an uncomplicated procedure for calculating peak discharge from small catchments using standard rainfall-runoff computation methods. Numerical solutions for dimensionless peak discharge are presented in the form of graphical relations, and also as mathematical expressions that approximate the graphs closely. Comparing peak discharge found by this approach to the rational formula provides a means of evaluating the relation between runoff coefficients and rainfall return periods. When compared to runoff coefficient adjustment factors found by others for 36 undeveloped watersheds in Texas, the return period adjustment factors calculated here illustrate the large differences that result because of the wide variability of parameters that influence small catchment runoff (such as precipitation, soils, and land-surface cover) within a region as vast as Texas.
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