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<br />STREAM HYDROLOGY <br /> <br />TABLE 2 <br />Peak Flood Flow Values <br /> <br />Colorado River, Project Study Reach <br /> <br />Flood Frequency <br /> <br />Flow (crs) <br /> <br />n,e rlood <br />determined <br />the area <br />Greenhorne <br /> <br />5-year 44,000 <br />la-year 55,000 <br />50-year 73,000 <br />1 OO-year l-O-~O '32.,000 <br />SVcJ- ~ 107, 000 <br />rrequencies and peak rlows shown in Table 2 were <br />by the U.S. Army Corps or Engineers. Other studies of' <br />were done by Simons, Li & Associates, Inc. and <br />and O'Mara, Inc. <br /> <br />~bAN FORMUbAflON <br /> <br />The Colorado River in recent history has <br />rorces, excessive sedimentation loads and <br />must be considered in any project design. <br />a p 1 an-or-- improvement, the plan must: <br /> <br />demonstrated erosive <br />rlood problems which <br />In the development Or <br /> <br />Incorporate existing protection measures <br />Consider the river's erosive rorces <br />Maintain the existing river alignment <br />Be cost erFective <br /> <br />The study reach was divided into six design reaches. <br />reaches are: <br /> <br />These <br /> <br />Reach <br /> <br />Channel cleaning, river station 3B2.50 to station <br />383.10 <br /> <br />Reach 2 <br /> <br />Rock jetties, river station 382.60 to station 3B3.00 <br /> <br />Reach 3 <br /> <br />Diking, river station 383.00 to station 383.25 <br /> <br />Reach 4 <br /> <br />Reshaping right bank, river station 383.50 to station <br />383.65 <br /> <br />Reach 5 <br /> <br />Rip-rap lert bank, river station 383.28 to station <br />383.80 <br /> <br />Reach 6 <br /> <br />Rip-rap lert bank, river station 384.00 <br />