| Abstract: | This manual provides methods for estimating the magnitude and frequency of floods on unregulated and unurbanized streams in Indiana that drain at least 15 square miles (38.8 square kilometres). The methods provide the design engineer with a means of estimating flood frequencies without having to analyze the records at individual streamflow sites.
The estimating equations in this manual are based on relations between floods of specific return periods and selected watershed characteristics. The most significant factors for estimating flood peaks in Indiana were found to be drainage area and precipitation index. The shape of a watershed was also found very significant in development of the regional equations. Other variables used in the regional equations are physical characteristics that further explain differences in the magnitudes of floods from the watersheds.
The regional equations are multivariate regression equations that relate peak discharges of 2-, 5-, 10-, 25-, 50-, and 100-year recurrence intervals to watershed characteristics and are essentially for natural streams. In this study, if 25 percent or more of the drainage area of a stream is above a reservoir, it was considered to be regulated, and flood peaks from it were not included in the analysis unless it could be determined that flood peaks were not materially affected, as in the case of several streams below small water-supply reservoirs. The equations also do not apply to streams that are affected by a high degree of urbanization. |
| Genre: | USGS Numbered Series |
| ProdID: | 4036 |
| Citation Author: | Davis, L. G. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | - |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | v, 40 p. :ill., maps ;26 cm. |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Circular |
| Citation Series Code: | CIR |
| Citation Series Number: | 710 |
| Citation Search Results Text: | Floods in Indiana: technical manual for estimating their magnitude and frequency; 1974; CIR; 710; Davis, L. G. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 1974 |
| Type: | citation/reference |
| Text: | Floods in Indiana: technical manual for estimating their magnitude and frequency; 1974; CIR; 710; Davis, L. G. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/circ/1974/0710/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/circ/1974/0710/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
