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<br />The Cache La poudre River was studied in detail. <br /> <br />Those areas studied by detailed methods were chosen with consider- <br />ation given to all proposed construction and forecasted development <br />through 1982. <br /> <br />2.2 Community Description <br /> <br />The City of Greeley, is located in the central part of weld County, <br />in north-central Colorado. Greeley is approximately 50 miles north <br />of Denver, the state capital. <br /> <br />Greeley has grown rapidly in recent years from approximately 38,900 in <br />1970 to an estimated 54,140 residents in 1975 (Reference 1). <br /> <br />The climate of Greeley is typical of the eastern foothills of the <br />Rocky Mountains. The mean annual temperature is 48.40F; the warmest <br />month is July (73.30F) and the coldest month is January (24.50F). <br />The average annual precipitation in Greeley is 12.2 inches (Refer- <br />ence 2). <br /> <br />The study reach of the Cache La Poudre River is approximately <br />2.8 miles long, with a channel gradient of 7.3 feet per mile. The <br />stream flows southeasterly through the northern part of the city. <br />Development within the flood plain consists of commercial, industrial, <br />and residential structures. <br /> <br />The soil type within the Cache La poudre River flood plain is <br />classified as Fluvaquents-Fluvents (Reference 3). <br /> <br />2.3 Principal Flood Problems <br /> <br />Major floods on the Cache La Poudre River are caused by intense <br />rainfall from localized thunderstorms in May through September. The <br />potential for floods is also increased due to snowmelt in May, June, <br />and July. <br /> <br />The worst flood on record occurred in 1917 and had a computed fre- <br />quency greater than 100 years and an estimated discharge of 13,000 <br />cubic feet per second (cfs), causing approximately $3000 in damages <br />(Reference 4). Floods of significance from the Cache La Poudre <br />River occurred in the Greeley area in 1864,.1876, 1884, 1904, 1917, <br />1923, 1947, 1949, and 1951. The most recent flood occurred in 1965; <br />the recorded frequency was estimated at approximately 11 years and <br />the discharge was 3480 cfs. <br /> <br />2.4 Flood Protection Measures <br /> <br />There are no flood control structures within the study reach on the <br />Cache La poudre River which would reduce flooding potential. <br /> <br />3 <br />