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<br />MONTROSE FLOOD PLAIN STUDY <br />HYDROLOGY ADDENDU~I <br /> <br />I . ~,ENERAL <br />A. Vicinity Description <br />The City of Montrose is located on the Colorado west slope within <br />the Uncompahgre River Basin. approximately 25 mil es upstream of the confl uence <br />of Ue Uncompahgre River with the Gunnison River. Montrose also 'Iies approxi- <br />mately 60 miles south of Grand Junction and the confluence of the Gunnison and <br />Colorado Rivers. Figure 1 shows Montrose and vicinity. <br />Montrose has historically been an agricuHural community and is <br />curn~ntly expand i ng its i ndustri a 1 economic base. The vall ey agri culture is <br />supported by irrigation water supplied from the Gunnison and Uncompahgre <br />Rivel's. The Gunnison River water is transported to the Montrose area via <br />the (iunnison Tunnel and South Canal which is administered by the Uncompahgre <br />Watel' Users Association. The industrial expansion is pr'imarily tow,ard support <br />indw;tries for energy development in the Hestern Colorado Region. <br />The average annual precipitation for the Montrose vicinity is approximately <br />9 'in,:hes. The hydrologic environment is model"ated by th,~ Uncompahgre Pl ateau <br />mountain range to the southwest of Montrose. The orographic effect of the <br />UncOlnpahgre Plateau places Montrose and the Uncompahgre Valley in a snow <br />"shaclJw" in the winter. This orographic barr'ier also limits the influx of <br />mois'; air masses 'into the valley during the summer. The result is ,a low <br />summw and winter precipitation within the va 111 ey. <br /> <br />. <br /> <br />1 <br />