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water requirements, hatchery site, hatchery <br />facilities, trout spawning possibilities, and <br />rough fish control. <br />25. Barrett, W. C., and C. H. Milligan. 1953. IRRIGATION <br />Consumptive water use and requirements in WATER QUAN. <br />the Colorado River area of Utah. Utah COLORADO R. <br />Agricultural Experiment Station, Logan. <br />Special Report 8. Z8 pp. <br />Summarizes the supply and demand for water from <br />the Colorado River with primary emphasis on use <br />of irrigated waters for agriculture. (Wydoski) <br />26. Bassett, H. W. 1957. Further life history FISH <br />studies of two species of suckers in COMPETITION <br />Shadow Mountain Reservoir, Grand County, ' <br />Colorado. M.S. thesis, Colorado State <br />University, +ort Collins. 112 pp. <br />Aspects of the life history of the longnose and <br />white suckers were made in this reservoir that <br />empties into the Colorado River about one mile <br />south of Grand Lake Village, Colorado. (Wydoski) <br />27. Bartschi, D. K. 1976. A habitat discharge FLOW <br />method of determining instream flows for HABITAT ALT. <br />aquatic habitat. In: Instream flow WATER QUAN. <br />needs, Volume II. Proceedings of the MANAGEMENT <br />Symposium and Specialty Conference. <br />Boise, Idaho, pp. 285-294. <br />A habitat-discharge method of determining <br />instream flows for aquatic habitat has been <br />developed and applied by the Intermountain <br />Region of the Forest Service. The method <br />relates stream habitat loss to reductions in <br />stream discharge and is based on the assumption <br />that suitable aquatic habitat will meet the <br />requirements of the biological components of <br />the ecosystem. Studies of Intermountain <br />Region streams have shown that adequate habitat <br />preservation requires an instream flow equal to <br />no less than 80 percent retention of the index <br />flow habitat values. Recommended flows are <br />therefore at or above the 80 percent retention <br />value and are correlated with the species of <br />life cycle needs associated with each stream. <br />21 <br />