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Last modified
7/14/2009 5:02:33 PM
Creation date
5/17/2009 11:28:02 PM
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UCREFRP
UCREFRP Catalog Number
8214
Author
Modde, T., D. Irving and R. Anderson.
Title
Habitat Availability and Habitat Use of Endangered Fishes in the Yampa River during Baseflow Periods.
USFW Year
1997.
USFW - Doc Type
Vernal, Utah and Grand Junction, Colorado.
Copyright Material
NO
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<br />Surveys were done in these clusters on September 10 and 11 at flow of 133 and 122 cfs, <br />respectively. At these flows bed profiles were surveyed at three shallow riffles that had maximum <br />depths of 1.0ft or less. The most downstream riffle was a cross section 2 in the sequence. The two <br />other riffle profiles were across gravel/cobble bars that were not perpendicular in the channel. <br />Since bed profiles had to measure the shallowest contour of these riffles, these profiles were <br />diagonal to the banks and therefore these sites would not model well at higher flows. <br /> <br />The deepest measurement at cross section 2, at 133 cfs was 0.64 ft. At this flow the WSL was <br />89.22. To achieve a depth of 1.0 feet at this cross section, WSL must rise 0.36 ft, or have an <br />elevation of 89.58, which is produce by a flow of 336 cfs. (Appendix 2, Table 6). <br /> <br />Cross section 7 was on a control and cross section 8 was located just upstream, at the lower end <br />of a run. A bed profile was done between cross section 7 and 8 on a shallow diagonal submerged <br />bar. At 122 cfs, the deepest reading was 1.0 ft. <br /> <br />Depth readings were made at the shallow riffle at the upper end of Cluster 63.5. This profile <br />was not surveyed because of land owner denial to access the left bailie Therefore, the uppermost <br />cross section (9), was across a scour pool, not the shallowest part of the riffle. The riffle above <br />cross section 9 was complex in that flow was split by a bar in midchannel and had perpendicular <br />flow on the left channel, but on the right channel flow was lateral across a very shallow cobble <br />riffle. Depth measurements were taken along the shallowest profile with the rod. The deepest point <br />was 0.6 ft. at the flow of 122 cfs (Table 6). <br /> <br />Cluster 7 (rm 73.3) <br /> <br />This cluster was surveyed at a flow of 288 cfs. A bed profile was taken at the shallowest part of <br />the riffle downstream of the control, cross section 1. The deepest reading was 1.27 feet at a WSL of <br />90.99. The flow that would produce a WSL of 90.72 was modeled to be 160 cfs (Appendix 2, Table <br />7). <br /> <br />Cross section 5 was across the shallowest part of the upstream riffle. The deepest measurement <br />was 1.42 ft at 288 cfs. A depth of 1.0 ft would be produced at a flow of 85 cfs (Appendix 2, Table <br />7). <br /> <br />Cluster 11 (rm 78.8) <br /> <br />This cluster was surveyed at a measured flow of 135 cfs. A bed profile was not taken at the <br />shallowest part ofthe riffle downstream of the control. The maximum depth on the control cross <br />section, which was noticeably deeper, was 0.91 ft. A flow of 163 cfs would be required to increase <br />the maximum depth to 1.0 ft on cross section 1. <br /> <br />The shallowest part of the upstream riffle had a maximum depth of 0.8 ft at the time the cluster <br />was surveyed. A flow of 230 cfs would be needed to produce a maximum depth of at least one foot <br /> <br />43 <br />
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