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<br />Local drainage problems in Frederick caused by a lack of adequate <br />drainage facilities to collect and convey runoff from areas east of <br />town were not studied. <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 Corrununity Descr.i.ption <br /> <br />The Town of Frederick is a small community located in a mining and <br />agricultural area of southwestern Weld County, in northeastern <br />Colorado. The Town of Evanston is directly north and the Town of <br />Dacono is directly south. The nearest large communities are Longmont, <br />8 miles northwest, and Boulder, 16 miles west. <br /> <br />Frederick was established in 1907 as a coal mining community known <br />as McKissick and incorporated on land owned by Frederick Clark <br />(Reference 1). The town is built directly over a honeycomb of old <br />mine shafts. Fredp~ick is a residential community and had a popula- <br />tion of 739 according to 1975 county estimates (Reference 2). <br /> <br />The Tri-Area Drainage Basin consists of gently rolling land on the <br />eastern plains of Colorado. Land use is approximately 90 percent <br />agricultural. Corn and sugar beets have been the major crops in the <br />past, but small grain crops arc now more prominent. Soil types in <br />the basin are the Weld-Adena-Colby association above the Town of <br />Frederick and the Ascalon-Olney-Vona association between Firestone <br />and Frederick. These soils are deep, well-drained, gently sloping <br />soils found on upland plains (Reference 3). <br /> <br />Drainage flows from the south and cast are intercepted above Frederick <br />by a levee and a canal system and diverted to the west side of town, <br />where the Tri-Area Drainageway parallels the Union Pacific Railroad <br />to the north edge of town. Drainage flows eventually reach the St. <br />Vrain River. <br /> <br />The average annual temperature in Firestone is 50 F, and the average <br />annual precipitation is 13 inches (Reference 4). <br /> <br />Development in the flood plain is mainly residential. <br /> <br />2.3 Principal Flood Problems <br /> <br />The most significant floods of recent times in the Frederick area <br />occurred in 1957, 1961, and 1965. The major causes of floods are <br />either cloudbursts or intensive rainstorms which normally occur <br />during the period of May to August. <br /> <br />On June 3, 1961, the maximum flood of record occurred when between 2 <br />and 4 inches of rain fell in a 2-hour period in the Tri-Town area. <br />Drainageway flows swelled and flooded sections of Firestone, Evanston, <br />Frederick, and Dacono. The rush of water overflowed the drainage <br />ditch built along the south edge of Frederick, sending a wall of <br />water through the town (Reference 5). This was similar to the <br /> <br />3 <br />