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<br />9aging stations located at dirrerent points along its length. <br />The station which would record most accurately the rlows along <br />this reach is located at the Colorado-Utah state line. The J98~ <br />peak rlow was 69,800 crs and occurred on May 26. <br /> <br />TABLE 1 <br />Peak Flows or Historical Floods <br />(in cubic reet per second) <br /> <br />YeQL <br /> <br />!J",Qe. Re",-d.iog <br /> <br />D9-.te. <br /> <br />1884 <br />1921 <br />1957 <br />1983 <br />1984 <br /> <br />est 125,000 <br />81, ] 00 <br />56,800 <br />60,200 <br />69,800 <br /> <br />July 4 <br />June 15 <br />June 9 <br />June 27 <br />May 26 <br /> <br />FLOODING CHARACTERISTICS <br /> <br />During a rlood, the velocity or rlow in the channel or the river <br />averages 4 to 9.5 reet per second throughout the study reach. <br />Floodwaters in the overbank may rlow as slowly as 1 root per <br />second. Given these rloodwater rlow rates a number or phenomena <br />will occur. Water rlowing at a rate or 7-8 reet per second or <br />greater will cause severe erosion or streambanks and lands and is <br />capable or transporting rocks and large trees. Water rlowing at <br />about 2 reet per second or less will deposit sand, silt and other <br />rloodborne debris. <br /> <br />The rloodplain has a number or natural and man-made obstructions <br />to streamsrlow including trees, brush, gravels, rocks, and <br />various other structures. Without stabilization structures or <br />natural streambank armament, the river will migrate across the <br />rloodplain during periods or rlood, as was experienced in many <br />locations during the 1983 and 1984 rloods. <br /> <br />THE 1964 fLOOD <br /> <br />The 1984 rlood was or a lesser magnitude than the estimated rlood <br />or July 4, 1884, and the recorded rlood or June 15, 1921. The <br />area in and around Grand Junction experienced rlooding conditions <br />ror several weeks because or the prolongedrlooding. Severe <br />erosion occurred because or this rlooding throughtout the study <br />reach. <br /> <br />On September 14, President Reagan declared Mesa County eligible <br />ror certain rederal disaster relier runds. The rederal disaster <br />declaration allowed the F~deral Emergency Management Agency to <br />provide public assistance to Colorado communities. No rederal <br />runds were available ror the construction Or any permanent <br />erosion and rlood control measures ror declared communities. <br />