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<br />Floods caused by overflow of Spring Creek Tributary and the Western <br />Flow path to Spring Creek Tributary were studied in detail. Spring <br />Creek Tributary is the only major drainageway flowing through the <br />Town of Nunn. <br /> <br />Those areas studied by detailed methods were chosen with consider- <br />ation given to all proposed construction and forecasted development <br />through 1990. <br /> <br />2.2 Community Description <br /> <br />The Town of Nunn is located in northwestern Weld County, in north- <br />central Colorado, approximately 20 miles north of Greeley, Colorado. <br /> <br />This municipal area of 640 acres was named Maynard in 1904 by the <br />Union Pacific Railroad and was incorporated as the Town of Nunn in <br />1908. The populations for 1972 (Reference 1) and 1976 (Reference 2) <br />were 270 and 315, respectively; population projections for 1990 <br />estimate a population of 500 people (Reference 1). The town functions <br />as a small, agriculturally oriented service center for surrounding <br />farms and ranches. <br /> <br />The average annual temperature in Nunn is approximately 490Fi the <br />average annual precipitation is 11.8 inches (Reference 3). <br /> <br />Spring Creek Tributary is an intermittent stream, which flows <br />through the center of the Town of Nunn in a southeasterly direction. <br />In the narrow, 8-square mile basin extending northwest of Nunn, <br />Spring Creek Tributary is little more than a drainage swale through <br />pasture lands and croplands. Near the center of town, it flows in a <br />channel approximately 30 feet wide and from 3 to 8 feet deep. Its <br />gravelly streambed has an average slope of 31 feet per mile. The <br />banks are covered with sage brush and natural grasses. <br /> <br />The primary underlying soil types in Nunn are of the Nunn-Dacono- <br />Altvan Association, which are deep and well drained (Reference 4). <br /> <br />Residential dwellings make up the main development in the flood <br />plain of Spring Creek Tributary. <br /> <br />2.3 Principal Flood Problems <br /> <br />The main cause of flooding in Nunn is usually intense rainfall in <br />the late spring and thunderstorms in the summer. <br /> <br />Documentation of historical floods and damage estimates in Nunn is <br />sparse. Spring Creek has caused flooding in 1935, 1951, 1954, 1961, <br />1965, 1972, 1974, and 1977, but there are no recorded discharges or <br />damage estimates. Personnel of Gingery Associates, Inc., did, <br />however, observe the effects of the flood which occurred on May 1, <br />1977. The extent of the flood plain at numerous locations in town <br /> <br />3 <br />