Laserfiche WebLink
<br />Conduit. A closed channel to convey water through, around, or under a dam. <br /> <br />Construction joint. The interface between two successive placings or pours of <br />concrete where bond, and not permanent separation, is intended. <br /> <br />Contact grouting. Filling, with cement grout, any voids existing at the con- <br />tact of two zones of different materials, e.g. between a concrete tunnel <br />lining and the surrounding rock. <br /> <br />Core. A zone of low permeability material in an embankment dam. <br />~times referred to as central core, inclined core, puddle clay <br />clay core, or impervious zone. <br /> <br />The core is <br />core, rolled <br /> <br />Core Wall. A wall built of relatively impervious material, usually of con- <br />crete or asphaltic concrete in the body of an embankment dam to prevent <br />seepage. <br /> <br />Crest of dam. See top of dam. <br /> <br />Cross section. An elevation view of a dam formed by passing a plane through <br />the dam perpendicular to the axis. <br /> <br />Cutoff trench. A foundation excavation later to be filled with impervious <br />material so as to limit seepage beneath a-dam. <br /> <br />Cutoff wall. A wall of impervious material usually of concrete, asphaltic <br />concrete, or steel sheet piling constructed in the foundation and abutments to <br />reduce seepage beneath and adjacent to the dam. <br /> <br />Dam. A barrier constructed across a watercourse for the purpose of storage, <br />control, or diversion of water. <br /> <br />a. Afterbay dam. See regulating dam. <br /> <br />b. Ambursen dam. A buttress dam in which the upstream part is a <br />relatively thin flat slab usually made of reinforced concrete. <br /> <br />c. Arch dam. A concrete or masonry dam which is curved upstream so as <br />to transmit the ~ajor part of the water load to the abutments. <br /> <br />d. Buttress dam. A dam consisting of a watertight part supported at <br />intervals on the downstream side by a series of buttresses. Buttress <br />dam can take many forms, such as a flat slab or massive head buttress. <br /> <br />e. Cofferdam. A temporary structure enclosing all or part of the <br />construction area so that construction can proceed in the dry. A <br />diversion cofferdam diverts a stream into a pipe, channel, tunnel, or <br />other watercourse. <br /> <br />f. Crib dam. A gravity dam built up of boxes, crossed timbers or <br />gabions, filled with earth or rock. <br /> <br />-2- <br />