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<br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I' <br />I' <br />I <br />I <br />I <br /> <br />Woodward. Clyde Consultants <br /> <br />5.0 <br />PLAN OF DEVELOPMENT <br /> <br />5.1 PHYSICAL PLAN <br /> <br />5.1.1 Existing Facilities <br /> <br />Douglas Dam is described as a rolled earth embankment with a crest length of about <br />3700 feet, a crest width of 20 feet and a maximum dam height of about 39 feet. The <br />existing spillway consists of an earth cut with a concrete sill about 80 feet wide and 70 <br />feet long located near the left abutment of the dam. A lower area in the dam crest <br />measuring 200 feet long is located along the north. The outlet works consist of a 48-inch <br />diameter steel pipe through the embankment with slide gates and a gate well in the <br />center of the embankment. A layout of the dam is shown on Figure 5-L <br /> <br />The U.S. Army Corps of Engineers Phase I Inspection Report (1978) indicates that <br />Douglas Dam was first filed with the state of Colorado in 1901. In 1963 the original <br />outlet works were removed and the present outlet works were constructed. <br /> <br />In late May, early June of 1990 seepage developed at Douglas Dam on the downstream <br />slope of the dam, immediately above the outlet works and access road. On the 15th of <br />June the wet area was about 50 feet long and 4 feet high (vertically) and the seepage <br />which had been channelized and diverted was about 12 gallons per minute (gpm). By <br />June 26 the seepage had increased to about 18 gpm and the wet area was very soft. It <br />was decided at this time by representatives of Windsor Reservoir and Canal Company, <br />. Water Supply and Storage Company, Woodward-Clyde Consultants and the Colorado <br />State Engineer's Office to place a sand blanket with a drain pipe over the wet area, to <br />drain the reservoir and to provide continuous monitoring of the seepage. The sand <br />blanket and drain pipe were completed by June 29. The reservoir was lowered at a rate <br />of about 0.3 feet per day and by July 5 the seepage had diminished to about 12.5 gpm. <br />On August 1 two test holes were drilled in the embankment to monitor the water level <br />as the dam was being drained and to collect preliminary geotechnical data on the <br />embankment fill. <br /> <br />22539G/DOUGLAS.DAM 12-17-90/REPORTS3 <br /> <br />21 <br />