Abstract
A regional flood-frequency curve is presented for the Santa Ynez River and adjacent areas in southern California. This curve was developed to improve estimates of return periods for very extreme floods on the Santa Ynez River and to evaluate the likelihood that Bradbury Dam, with its present spillway capacity of 4500 cms, would be overtopped. Peak-flow data from 31 gaging stations in the region were used in the analysis. The flood-frequency curve was fit using an index flood method and the assumption that floods in this region follow the log-Pearson Type III distribution. Estimates of the parameters for this distribution were found to be independent of basin size. The resulting flood-frequency curve for the Santa Ynez River region is relatively steep: the discharge from the 100-yr flood is about 10 times that of the mean annual flood, and of the 1000-yr flood, about 20 times that of the mean annual flood. The discharges of the 100-yr and 1000-yr floods on the Santa Ynez River are 1150 cms and 2300 cms, re...
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