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<br />2 <br /> <br />The portion of the Colorado River that the <br /> <br /> <br />Hydraulics Unit studied :Eor t:his report started at <br /> <br /> <br />the Grand Valley Diversion Dam and continued ups1.xearn <br /> <br /> <br />for 10 miles. Wi thin t:his reach t,here are four pro'-' <br /> <br /> <br />posed bridge crossings. The loca.t.:i.ons are shown on <br /> <br /> <br />figure 1. <br /> <br /> <br />The object of this :report :is t.o es'l:imate a a.esign <br /> <br /> <br />discharge which will be used to set channel encroachment.s, <br /> <br /> <br />minimum roadway profile,. protection requirements" and <br /> <br /> <br />study the effects on sid.~ drain<~ge. Considering Depart:-- <br /> <br /> <br />ment policy and the ini.tial cost compared to the cost of <br /> <br /> <br />repair or replacement th.~ :;0 year flood t,l'as considered to <br /> <br /> <br />give a balanced design. <br />