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<br />21 <br /> <br />CONCLUSION <br /> <br />The peak discharges recorded by the 9aging stations <br />along the Colorado River show a downward trend durinCj t:he <br />past 30 years. Several rese::voir"!; and diversions i:hat <br /> <br /> <br />affect peak flow have been built durlng this ti.me ped.ocL <br /> <br /> <br />Their effect was estimated bv analvzin9 gaginCj station re- <br /> <br />cords of tributaries unaffec~ed <br /> <br />controlSm The period <br /> <br />before 1934 was considered unaffc eLed by cont.rols ~ rrhi.s <br /> <br /> <br />base period I s 50 year flood was reduced by 2:;% to arr.ive <br /> <br /> <br />a t the design 50 year flood of 4 J. ,00 () cfs for :)eBeque Canyon. <br />