| Abstract: | Drainage-basin and channel-geometry multiple- regression equations are presented for estimating design-flood discharges having recurrence intervals of 2, 5, 10, 25, 50, and 100 years at sites on unregulated rural streams in Iowa. Statewide drainage-basin equations were developed with average standard errors of prediction that ranged from 38.6 to 50.2 percent. Drainage-basin characteristics were quantified for 164 streamflow-gaging stations using a geographic-information-system procedure to process topographic maps and digital cartographic data. The significant drainage-basin characteristics identified included contributing drainage area; relative relief; drainage frequency; and 2-year, 24-hour precipitation intensity. Statewide and regional channel-geometry equations that are dependent on whether a stream has been channelized were developed with average standard errors of prediction for the statewide channel-geometry equations that ranged from 41.0 to 68.4 percent and for the regional channel-geometry equations from 30.3 to 70.0 percent. Channel-geometry characteristics were measured onsite and on topographic maps for streams at 157 streamflow- gaging stations. The significant channel-geometry characteristics identified for the statewide and regional regression equations included bankfull width and bankfull depth for natural channels and active-channel width for channels affected by channelization. |
| Genre: | USGS Numbered Series |
| ProdID: | 26909 |
| Citation Author: | Eash, D. A. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | vi, 96 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
Books and Open-File Reports [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 93-4062 |
| Citation Search Results Text: | Estimating design-flood discharges for streams in Iowa using drainage-basin and channel-geometry characteristics; 1993; WRI; 93-4062; Eash, D. A. |
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| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Estimating design-flood discharges for streams in Iowa using drainage-basin and channel-geometry characteristics; 1993; WRI; 93-4062; Eash, D. A. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1993/4062/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1993/4062/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
Books and Open-File Reports [distributor], |
