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Last modified
7/14/2009 5:02:33 PM
Creation date
5/22/2009 5:27:22 PM
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UCREFRP
UCREFRP Catalog Number
8106
Author
Anderson, R. M.
Title
Riverine Fish-Flow Investigations.
USFW Year
1998.
USFW - Doc Type
Fort Collins, Colorado.
Copyright Material
NO
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<br />variable with the highest mean of the inflection points on rimes (111 cfs) and it was 80, <br /> <br /> <br />202, and 522 square feet for rimes, runs, and pools, respectively (Table 5: A-B-C). <br /> <br /> <br />Average velocity is an important criterion for distinguishing habitat types. Rimes <br /> <br /> <br />have faster currents and larger particle size while runs and pools typically have lower <br /> <br /> <br />velocities and sandy substrates. The mean of the inflection points for the velocity/flow <br /> <br /> <br />relationship was 1.5 ft/sec in riffles, 0.6 ft/sec in runs and 0.2 ft/sec in pools (Table 5: A- <br /> <br /> <br />B-C). Velocities of 1.0 ft/sec are maintained on some riffles at flows as low as 20 cfs to <br /> <br />40 cfs. At these rimes the channel confines the current to the narrowest part of the <br /> <br />thalweg, so velocity is maintained but in a narrow inner channel. But even on these <br /> <br />riffles, velocity very quickly drops to near zero as flow continues to be reduced. <br /> <br />PHYSICAL HABIT AT SIMULATION <br /> <br /> <br />Colorado Squawfish Habitat Availability <br /> <br /> <br />Gross wetted area (GWA) is simply the wetted surface area of the river at a given <br /> <br /> <br />flow. Since most fish require a certain minimum depth, GW A does not represent fish <br /> <br /> <br />habitat availability. GW A was determined for 6 clusters in Strata 6, and 7 clusters in <br /> <br /> <br />strata 8 (Figure 6). The inflection point for the mean curves was identified to be 80 cfs <br /> <br /> <br />for Strata 6 and 150 cfs for Strata 8, and 80 cfs for all clusters. Strata 8 has higher GW A <br /> <br /> <br />-at all modeled flows compared to Strata 6. At 150 cfs the GW A for Strata 8 was 16.5% <br /> <br /> <br />higher than at Strata 6 (199,336 versus 171,117). <br /> <br />24 <br />
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