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<br />.21 <br /> <br />CONCLUSION <br /> <br />The peak discharges recorded by the gaging stations <br />along the Colorado River show a downward trend during the <br />past 30 years. Several reservoirs and diversions that <br />affect peak flow have been built during this time period. <br />Their effect was estimated by analyzing gaging station re- <br />cords of tributaries unaffected by controls. The period <br />before 1934 was considered unaffected by controls. This <br />base period's 50 year flood was reduced by 25% to arrive <br />at the design 50 year flood. of 41,000 cfs for DeBeque Canyon. <br />