Laserfiche WebLink
<br />Table 16. Optimum flows in cubic feet/second for Colorado squawfish <br />and razorback suckers with the 1987 suitability index curves <br />and the modified curves at 0.6 and 0.8 tenths depths in the <br />Green River at the Ruple Ranch study site, river mile 332.3, <br />with 90 percent flow windows in parentheses. <br /> <br />1987 Suitability Index Curves <br /> <br />Modified Suitability Index Curves <br /> <br />0.6 <br /> <br />0.8 0.6 <br /> <br />0.8 <br /> <br />Colorado squawfish <br />Adult <br />1200 ( 700-2200) <br />Deposition <br />1500 (1100-2400) <br /> <br />1500 (700-3000) 1000 ( 500-2000) <br />1600 (1100-2400) 3000 (1800-4200) <br /> <br />1500 ( 500-2700) <br />4200 (2200-5600) <br /> <br />Razorback sucker <br />May & June <br />2200 ( 900-4200) <br />July-October <br />1600 (1100-2300) <br /> <br />3000 (1000-5600) 3000 (1100-5600) <br />1900 (1400-2700) 1600 (1100-2300) <br /> <br />5600 (1600-7700) <br />1900 (1400-2700) <br /> <br />4. Discussion <br /> <br />An over all flow window for the Green River at the Ruple Ranch site can be <br />developed from any of the values given in Table 16. If it is assumed that 0.8 <br />depth is a more accurate measurement of velocity use than 0.6 depth, and that <br />the modified curves are more realistic diagrams of habitat use than the <br />original curves. Assuming the modified curves and resultant habitat versus <br />dishcarge relationships are more accurate, an over-all periodic chart for <br />optimum flows can be developed (Table 17). From these results, a flow regime <br />can be recommended that will theoretically optimize habitat for all species <br />and life stages. This regime suggests a flow of 1700 cfs October to April, <br />2700 cfs in May, and 2200 cfs mid-June to September. In comparing these <br />results to the historic flow of record, the PHABSIM analyses for Ruple Ranch <br /> <br />26 <br />