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Chapter 11-- Project Description Chapter II - Project Description The proposed reservoir will be located at the same location as the original reservoir. The differences between the projects are related to the size of the facilities. The table below compares the project differences between the studies for the pump station, dam, spillway, and outlet works. Figure IT-I shows a general plan of the proposed project. Table II-I: Comparison of Characteristics Item Original Configuration Proposed Configuration Pump Station 5,000 gpm 6,300 gpm with option to expand to 8,400 gpm Dam Type Earthfill dam with cutoff trench; Earthfill dam with cutoff trench; blanket and toe drains; and chimney, blanket, and toe drains; riprap protection on upstream and riprap protection on face upstream face Dam Height 42 feet 55 feet Dam Crest Length 2,610 feet 4,820 feet Normal Stora~e Volume 5,200 acre-feet 8,850 acre-feet Normal Surface Area 230 acres 299 acres Crest Width 25 feet 25 feet Upstream Slope 4H:IV 3H:IV Downstream Slope 3H:1V 2.5H: I V Dam Crest Elevation 5200 feet 5225 feet Spillway Type Broad Crested Weir at Right RCC Section with Labyrinth Abutment Weir near maximum section Spillway Crest Elevation 5195 feet 5220 feet Spillway Width 350 feet 41 feet Embankment Volume 285,000 cubic yards 890,000 cubic yards Outlet Diameter 48 inches 36 inches Outlet Length 325 feet 320 feet The site description and geologic evaluation are generally consistent between the original study and this study. The geotechnical evaluation, hydrologic evaluation, outlet works, and raw water transmission systems vary considerably and are described in the following paragraphs. A. Geotechnical Evaluation The dam will be a homogeneous earthfill dam with chimney, blanket, and toe drains; riprap Dry Creek Reservoir Project 5 ElCJlfrlLE