| Abstract: | Maps depicting the influence of a climatic factor, C, on the magnitude of synthetic T-year (annual) floods were prepared for a large portion of the eastern United States. The climatic factors were developed by regression analysis of flood data using a parametric rainfall-runoff model and long-term rainfall records. Map estimates of C values and calibrated values of rainfall-runoff model parameters were used as variables in a synthetic T-year flood relation to compute ‘ map-model ‘ flood estimates for 98 small drainage basins in a six-state study area. Improved estimates of T-year floods were computed as a weighted average of the map-model estimate and an observed estimate, with the weights proportional to the relative accuracies of the two estimates. The accuracy of the map-model estimates was appraised by decomposing components of variance into average time-sampling error associated with the observed estimates and average map-model error. Map-model estimates have an accuracy, in terms of equivalent length of observed record, that ranges from 6 years for the 1.25-year flood up to 30 years for the 50- and 100-year flood. (Woodard-USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 28358 |
| Citation Author: | Lichty, Robert W.; Liscum, Fred |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iv, 44 p. :ill., maps ;27 cm. |
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| Citation Publisher: | Geological Survey, Water Resources Division, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 78-7 |
| Citation Search Results Text: | A rainfall-runoff modeling procedure for improving estimates of T-year (annual) floods for small drainage basins; 1978; WRI; 78-7; Lichty, Robert W.; Liscum, Fred |
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| Citation Year: | 1978 |
| Type: | citation/reference |
| Text: | A rainfall-runoff modeling procedure for improving estimates of T-year (annual) floods for small drainage basins; 1978; WRI; 78-7; Lichty, Robert W.; Liscum, Fred |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1978/0007/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1978/0007/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | Geological Survey, Water Resources Division, |
