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<br />Those areas studied by detailed methods were chosen with considera- <br />tion given to all proposed construction and forecasted development <br />through 1982. <br /> <br />2.2 Community Description <br /> <br />The Town of Dacono, is a small community located in a mining and <br />agricultural area of southwestern Weld County, in northeastern <br />Colorado. The Towns of Frederick, Evanston, and Firestone are <br />directly north. The nearest large cummunities are Longmont, 8 <br />miles northwest, and Boulder, 16 miles west. <br /> <br />Dacono was founded in 1906 as a coal mining community and incorporated <br />in 1908 (Reference 1). The town is built directly over a honeycomb <br />of mine shafts. Dacono is a residential community with a population <br />of 1610 according to 1975 county estimates (Reference 2). <br /> <br />The drainage basin consists of gently rolling land on the eastern <br />plains of Colorado. Land use is approximately 90 percent agricultural. <br />Corn and sugar beets have been the major crops in the past, but <br />small grain crops are now more prominent. Soil types in the basin <br />are the Weld-Adena-Colby Association above the Town of Frederick <br />and the Ascalon-Olney-Vona Association between Firestone and Frederick. <br />These soils are deep, well-drained, gently sloping soils, found on <br />upland plains (Reference 3). <br /> <br />The average annual temperature in Dacono is 50oF, and average <br />annual precipitation is 13 inches (Reference 4). <br /> <br />Drainage flows from agricultural fields south of Dacono run along <br />the west edge of town before spilling into town along east-west <br />streets. Flows. from the trailer park development, Glens of Dacono, <br />concentrate in a swale along State Highway 52 and spill into the old <br />section of town. <br /> <br />Development in the flood plains is primarily residential. <br /> <br />2.3 Principal Flood Problems <br /> <br />The most significant floods of recent times in the Dacono area have <br />occurred in 1957, 1961, and 1965. The major cause of floods are <br />cloudbursts or intensive rainstorms, which normally occur during the <br />period of May through August. <br /> <br />On June 3, 1961, between 2 and 4 inches of rain fell in a 2-hour <br />period in the Tri-Town area. Tri-Area Drainageway flows swelled and <br />flooded sections of Firestone, Evanston, Frederick, and Dacono. The <br />rush of water caused the drainage ditch built along the south edge <br /> <br />3 <br />