A technique for determining depths for T-year discharges in rigid-boundary channels
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Abstract
A simplified technique is presented for determining depths for 1-year discharges (the discharge that will occur, on an average, once in T-years-10 years, 50 years, 100 years) for natural channels (channels not significantly affected by manmade structures) having channel-control conditions and rigid boundaries (channels having a low probability of change that would significantly affect the hydraulic characteristics of a T-year discharge). Channel-control conditions usually exist during T-year discharges in natural rigid-boundary channels and, therefore, the simplified technique probably would be applicable for flood-inundation studies for many natural rigid-boundary channels. The technique requires that the T-year discharge for a reach of interest be known or readily available; also, a channel-shape factor, a width at a reference altitude, a channel-bottom slope (or a water-surface slope), and the Manning's roughness factor, n, must be estimated or determined at representative sections having channel-control conditions. The standard error of estimate for depths determined according to the simplified technique is not known; however, it is probably 25-30 percent. In comparison, the standard error of estimate for the depths determined according to the step-backwater procedure and to guidelines and specifications for flood-insurance studies of the Federal Insurance Administration is about 23 percent.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | A technique for determining depths for T-year discharges in rigid-boundary channels |
| Series title | Water-Resources Investigations Report |
| Series number | 77-83 |
| DOI | 10.3133/wri7783 |
| Year Published | 1977 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | iv, 38 p. |
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