C150057 Feasibility Study - Laserfiche WebLink

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2. Topography (elevation change and resulting head pressure) is similar to the current lateral alignment. 3. Long-tenn costs and administrative expenses for the West Rhone would be lower, although initial costs to the West Rhone would be higher. 4. This lateral alignment and service area coincides with existing topography, road alignments, and the Mesa County Buffer Zone. 5. Long-tenn water supply and lateral management problems would be fully resolved for the West Rhone shareholders, and Mure management of Lateral 395 would be simplified. 6. The closed system would allow any water not diverted by the West Rhone to remain in the GVIC Mainline canal, instead of spilling into Grand Junction Drainage District wasteways. Proposed Project Description The proposed project would involve the GVIC constructing a new headgate in the south side of their Mainline Canal, near the canal's 21 Road crossing. Immediately west of 21 Road, the canal crosses Hunter Wash via a flume, so the headgate would probably have to be located on the east side of 21 Road. The exact location of the headgate would be determined by the GVIC. A reinforced concrete pipeline intake structure and trash rack designed by the NRCS would be required to direct water into the pipeline. The pipeline would consist of approximately 6,500 feet of 12-inch plastic irrigation pipe rated at 80 psi, covered to a minimum depth of 30 inches, or whatever depth is required by Mesa County (see permitting section below). The preferred alignment of the pipeline would be within Mesa County's road right-of-way on the east side of 21 Road. Two road crossings would be required: one across J Road; and one across 21 Road, north of the drainage ditch that crosses 21 Road about 300 feet north of I ~ Road. A map of the proposed pipeline alignment is shown in Appendix D. Approximately 1.25 miles south of the canal, the new pipeline would tie into the existing 12-inch West Rhone Lateral pipeline. The new pipeline could deliver about 1,200 gallons per minute, which equals 2.7 cfs, or about 257 shares of GVIC water. The existing 12-inch West Rhone pipeline reduces in size to 10-inch, then to 8-inch, and has a 4-inch diameter for the last 330 feet (the distance from the last delivery turnout to the drainage ditch). The Grand Junction Office of the NRCS has prepared a preliminary cost estimate for the project. The estimated construction cost of the project is $80,000, not including the cost for the GVIC to construct the headgate. The NRCS would provide approximately $27,000 in cost- share funding for the project. The balance would be paid by the West Rhone Lateral Ditch Company through a long-tenn loan from the Colorado Water Conservation Board. West Rhone Lateral Ditch Company Headgate and Pipeline Feasibility Study August 2000 5 ------