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c:) c:-.... I- W (') <a Much valuable work was done in comparison of procedures both hydrologic and economic for evaluating flood control, however, no conclusions of significance were reached as to the effects of reservoirs on streamflow farther downstream. " A study of the Cheyenne River Basin above Angostura Dam is reported in Geological Survey Circular 223. The report, written by R. C. Culler and H. V. Peterson concerns a joint study by the Bureau of Reclamation and the U. S. Geological Survey. It was COllUIlenced in April 1950 and the report is dated 1953. The purpose was "to determine the total num- ber of stock reservoirs in the basin, the aggregate capacity of the reservoirs, the .amount of runoff stored each year, water losses in the reservoir resulting from evaporation and seepage, and finally, the effect of reservoir storage on runoff to Angostura Resel~oir, including the effect on intervening channel losses." Conclusions are based on surveys of 466 operating reservoirs in 49 sample areas selected at ran- dom in the Cheyenne River basin. The aggret!P-te storage capacity was 2,61B acre-feet and the aggregate drainage area 222 sq~re miles in a basin total of 9,100 square miles. As there were no records of reser- voir inflow, outflow and changes in stage, assumptions were _de based upon data from outside the basin. Conclusions of the study were that there were significant losses due to the reservoirs in that basin. The study has been continued since 1953. The Flood Control Controversy is a book written by Luna B. Leopold and Thomas Yaddock, Jr., and published in 1954 under sponsorship of the Conservation Foundation. It presents the technical problems involved in flood control. The authors show the possibilities and limitations, both of engineering structures and land management and analyze the effectiveness of upstream and downstream programs for flood control. Upstream and downstream programs are shown to be complementary but not interchangeable. The loss of vater through evaporation is recognized as a problem inherent in reservoirs where vater is retained in conserva- tion pools and evaporated to the detriment of established downstream vater rights. The authors do not attempt to evaluate the stream deple- tion effects of reservoirs but cite the Cheyenne River basin study previously mentioned in this report. III. CONCLUSIONS AND RECOMMENDATIONS . The more important phases of hydrologic analysis requiring coordina- tion have been discussed in Section I, HYDROLOGIC COORDINATION REQUIRED _ FACTS AND ANALYSES THEREOF, covering assignments (a) and (b). There is outlined under Section II, PRESENT STATUS OF RESEARCH PROGRAMS UNDER WAY TO DETERMINE EFFECT OF UPSTREAM RESERVOIRS UPON DOWNSTREAM WATER YIELD , findings with respect to assignment (c). a. Conclusions After considerable discussion and deliberation it vas concluded C/1-l3