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<br />pipe contains an upward oriented blind tee upstream from the gate valve to per- <br /> <br /> <br />mit temporary diversion of discharge from the pipeline if tIle well must be reha- <br /> <br />bilitated or test pumped. <br /> <br />B. Pipeline Laterals <br /> <br />The project includes approximately 115 miles of pipeline laterals. These <br /> <br />1 ateral s transport water from the sal vage well s to the conveyance channel in <br /> <br />Stages 1 through 4. Stage 5 will be a total pipe system, merging with the con- <br /> <br /> <br />veyance channel at the northwest boundary of Stage 4. All of the laterals are <br /> <br />low pressure systems. Many of the laterals are gravity-flow lines. Pipe diame- <br /> <br /> <br />ters range from 4 to 27 inches and a minimum cover over the pipe of 4.5 feet <br /> <br /> <br />provides protection from freezing. Contract specifications permitted the use of <br /> <br />virtually any type of pipe, but to date all but about 10,000 feet has been poly- <br /> <br />vinyl chloride (PVC). This 2-mile reach was constructed with asbestos-cement <br /> <br />pipe. <br /> <br />In addition to installing the pipelines, the lateral contracts included the <br /> <br />construction of the well head vaults, installation of the mechanical and <br /> <br />electrical equipment, and the access roads adjacent to the pipelines. <br /> <br />C. Conveyance Channel <br /> <br />The project conveyance channel provides the means of collecting the <br /> <br />salvaged ground water from the pipeline laterals and delivering it to the <br />Rio Grande. The channel is approximately 42 miles in length with the design <br />capacity increasing from 45 ft3/s to a maximum of 160 ft3/s. Bottom widths <br />range from 8 to 22 feet, and water depths from 3.6 to 5.6 feet. The flat <br />terrain of the Closed Basin and the invert of the Rio Grande dictated the use of <br /> <br />a very flat channel gradient that produces a flow velocity of about 1 ft/s. <br /> <br />6 <br /> <br />r- - -.-1 f.:' <br />\)..,.........:1...,u <br />