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La Poudre River floodplain are also of the Fluvaquents-Fluvents association (Reference 3). Sheep Draw flows in a northeasterly direction to its confluence wi th the Cache La Poudre River. The length of the study reach 1 s approximately 5.2 miles. Topography in the basin consists of gently rolling hills, with basin slopes varying from 1 to 3 percent. The primary land use in the basin is for irrigated croplands and pastures. The major soil types in the basin are of the Ascalon-Olney-Vona, Weld-Andena-Colby, and Fluvaquents-Fluvents associations (Reference 3). The Ashcroft Draw study reach, approximately 3.2 miles long, flows southeast to its confluence with the South Platte River, approximately 3 miles southwest of the City of Greeley. Basin slopes range from approximately 3 percent in the lower reaches to over 8 percent near the headwaters. Most of the basin is utilized as irrigated cropland, with a small portion devoted to rangeland and urbanized areas. The major soil types in the Ashcroft Draw basin are of the Ascalon-Olney-Vona associatian (Reference 3). The Eaton Draw study is comprised of two areas, one near the confluence of the Cache La Poudre River 0.61 miles long) and one near the Town of Eaton (2.08 miles long). In February 1978, the Town of Eaton annexed a part of Weld County along Eaton Draw containing floodplains. Eaton Draw flows south in a long, narrow basin between the Town of Nunn and the City of Greeley. The basin width varies from 1 to 3 miles, and the basin slopes vary from 2 to 5 percent. Most of the basin is used as irrigated cropland and pasture. Natural grasses and sage brush form most of the ground cover. The major soil types in t.he basin are of the Nunn-Dacana- Altvan, Ascalon-Platner-Stoneham, Renahill-Shingle, Weld-Adena- Colby, and Kim-Otero associations (Reference 3). The Tri-Area Drainageway (Frederick-Firestane-Dacono drainage basin) flows north through the Town of Dacano, Frederick, and Firestone to its confluence with the St. Vrain River. The portions of the drainageway outside of the towns' corporate limits are included in the study. Basin slopes range from 1 to 2 percent and channel slopes vary from 0.4 to 1.0 percent. Land use in the basin is approximately 90 percent agricultural and 10 percent urban. The spoil types are of the Weld-Adena-Colby, Platner-Ulm-Renahill, and Ascalon-Olney-Vana associations (Reference 3). The Big Thompson River study reach is approximately 12.4 miles long. The river flows in a general easterly direction to its confluence with the South Platte River about 5 miles southwest of Greeley. The lOa-year floodplain width varies from a minimum near 350 feet to a maximum near 3,500 feet with an average of 1,750 feet. The streambed has an average slope of 8 feet per mile through the study reach. The channel is alluvial and meanders through a u-shaped valley. The major portion of the floodplain in the study reach is in agricultural use. Few buildings of any type 5