Rainfall-Runoff Estimation Using Digital Radar
2007
Kutzman, Russell A.
Storm runoff is a critical concern to meteorologists and hydrological forecasters. A runoff algorithm, part of a series of tropical weather algorithms developed for the NEXRAD (Next Generation Weather Radar) radar system, is presented. The algorithm is based on the relationship between the rainfall over the basin and the discharge response at the gauge station. The algorithm is designed to provide runoff as a function of time for a given input(s) of rainfall. With known overflow levels, flood potential can also be evaluated. The runoff algorithm examined outflow at five basins within the operating scope of the Pittsburgh National Weather Service (NES) radar. A comparison of the observed runoff was made with the algorithm generated discharge. In general, hydrograph accuracies improved with increasing rainfall excess.
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