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Westminster, Colorado Jim Baker Reservoir <br />EARTH DAM AND SLURRY WALL <br />The site for Westminster Gravel Lake is located in <br />the Clear Creek Valley in Adams County, <br />Colorado. <br />RMC was retained to evaluate the site for the <br />feasibility of construction of a 1,200 acre-foot <br />reservoir. The reservoir would store exchange <br />water for augmentation of upstream Clear Creek <br />diversions. Groundwater modeling was required <br />to evaluate the effects of construction and <br />operation of the reservoir on adjacent properties. <br />In 1993, RMC was retained to design the reservoir <br />and prepare plans and specifications for the <br />project. Construction was performed in 1994 and <br />1995. RMC provided all construction related <br />engineering services. <br />3:1 with a crest width of 12 feet. A 3,430-foot <br />long perimeter slurry wall was constructed to <br />complete isolating the reservoir from the shallow <br />alluvial aquifer. <br />The reservoir has a 36-inch diameter ductile iron <br />pipe outlet works near the southeast corner of the <br />site. The outlet works is designed to drain the top <br />14 feet of the reservoir by gravity. A pump station <br />was designed and constructed to convey below <br />grade storage water. The over-the-embankment <br />spillway is designed to pass the Probable <br />Maximum Flood (PMF) and incorporates an ogee <br />section, concrete lined chute, and stilling basin. <br />The design includes a 4,035-foot long earth <br />embankment with a maximum height of 50 feet. <br />The embankment has upstream slopes of 3:1 <br />(horizontal to vertical) and downstream slopes of <br />ROCKY MOUNTAIN CONSULTANTS, INC. <br />