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Last modified
1/26/2010 10:08:27 AM
Creation date
10/5/2006 4:09:07 AM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Steep Channel Water Surface Profiles
Date
7/1/1971
Prepared By
CSU
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />3 <br /> <br />cause depth to shift from rapid flow depth to tranquil flow depth and <br />back to rapid flow depth at a single location. Consequently, the <br /> <br />theoretical methods of water surface elevation calculation for either <br /> <br />tranquil or rapid flows cannot be used in such natural channels. What <br /> <br />generally occurs in many natural channels of steep slope is a series of <br /> <br />short reaches of rapid flow, interspersed with longer reaches of tranquil <br />flow, which are developed in a stair-step fashion. The rapid flow <br />reaches never approach uniform flow. This condition is illustrated in <br />the photographs of stations 162+00, 214+00, and 341+00 in <br />Appendix E. Methods currently available for calculation of water <br />surface elevations for these mountain streams can only be applied if <br />a unique stage-discharge relation is supplied for each rapid flow <br />reach. As a practical matter, it may not be possible to identify each <br />rapid flow reach and generate the appropriate stage-discharge relation. <br /> <br />Objective <br />The objective of this study is to provide a computation scheme, <br /> <br />readily adaptable to computer techniques, which will calculate a reason- <br /> <br />ably accurate water surface elevation in streams where flows are near <br /> <br />critical and where the flow may be either tranquil or rapid. A computer <br /> <br />program based on this scheme will then provide a tool for rapid evalua- <br />tion of the effects of physical changes to a stream channel. Output <br /> <br />would supply pertinent hydraulic parameters such as discharge, surface <br /> <br />elevation, depth, velocity, Froude number and roughness. The program <br /> <br />may be applied to any problem involving a change in stream cross- <br /> <br />sectional geometry. The means of determining the effects of changes in <br /> <br />stream geometry upon water surface elevations would be first to select <br />
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