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Last modified
7/14/2009 5:02:36 PM
Creation date
5/22/2009 12:35:47 PM
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UCREFRP
UCREFRP Catalog Number
9493
Author
Gaeuman, D., P. R. Wilcock and J. C. Schmidt.
Title
High Flow Requirements for Channel and Habitat Maintenance of the Lower Duchesne River between Randlett and Ouray, Utah.
USFW Year
2003.
USFW - Doc Type
\
Copyright Material
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<br />FINAL REPORT, November 2003 <br />High-jlow Requirements for the Duchesne River <br /> <br />calibration data impossible that year. Peak runoff in 2001 was also below normal, but peak <br />water surface measurements at discharges up to 2,450 fe/s were obtained in May. Cross section <br />geometry was not re-surveyed at high flow. <br />The 24-hour Camp site consists of 10 monumented cross sections and five supplementary <br />cross sections (Figure 9). Stage observations most suitable for high-flow calibration at 24-hr <br />Camp were made May 26,2001 when discharge was 2,450 ft3/s and May 22,2001 when <br />discharge was 1,050 ft3/s. Five of the 24-hour Camp cross sections traverse a chute channel <br />active at moderate discharges. The chute portions of these cross sections were separated from <br />the main channel portions and used to construct an independent stream segment connected to the <br />main channel at upstream and downstream junctions. Flow in the chute began when main <br />channel discharge was about 1,050 ft3/s, and discharge in the chute was measured at 58 fe/s <br />when main channel discharge was 2,600 ft3 Is. <br />Five monumented cross sections were installed at Above Pipeline (Figure 10). A single <br />stage observation above base flow was obtained for the cross sections at the Above Pipeline site <br />on May 23, 2001 when discharge was 770 ft3/s. In spite of the small number of cross sections at <br />this site and the small discharge used in calibration, we believe that HEC-RAS modeling <br />provides a more robust method of estimating stage-discharge relationships at cross sections than <br />considering single cross sections in isolation. <br />At Wissiup Return, we installed seven monumented cross sections and three <br />supplementary cross sections (Figure 11). Useful stage observations were made at this site on <br />May 28,2001 when discharge was 1,840 ft3/s and May 16,2001 when discharge was 1,040 fe/s. <br />The Wissiup Return model also includes an independent chute channel segment consisting of <br />portions of six cross sections. This chute becomes active at higher flows than the chute modeled <br />at 24-hour Camp. The chute was conveying little flow when main channel discharge was 1,840 <br />ft3 Is, which is the highest discharge observed at the site. <br />Extrapolating observed stages to larger discharges at a single cross section, either by <br />applying a uniform flow equation such as the Manning equation or by fitting observed data to a <br />curve, does not take into account the effects of changes in downstream hydraulic controls that <br />may occur with changing discharge. Use of the HEC-RAS model allowed us to include the <br />effects of downstream controls on upstream cros-s sections. We developed one stage-discharge <br />relationship to serve as a downstream boundary condition for each modeled reach. Assuming <br /> <br />25 <br />
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