C15357 Feasibilty Study - Laserfiche WebLink

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. Alternatives Evaluated A range of alternatives were considered including 1) don't build the project, 2) replace the earth ditch with a concrete ditch, and 3) replace the earth ditch with a pipeline. A subjective evaluation of the alternatives follows: 1. Don't build the project: No action taken to solve this problem will leave the shareholders short of water and dealing with the high maintenance costs associated with a deteriorated ditch system. This alternative is feasible, but is not considered acceptable by the shareholders. 2. Replace the earth ditch with a concrete ditch: The existing ditch would be completely replaced with a new concrete lined ditch and control structures. This option would solve the seepage prOblem, and would be cheaper than a pipeline. This alternativ~ is feasible, and is preferred by the shareholders. . 3. Replace the earth ditch with a pipeline: The existing ditch would b~ completely replaced with a pipeline. This option would solve the seepage problem, but would be more expensive th~n a concrete ditch. This alternative is feasible, b~t is not preferred by the shareholders. The Natural Resources Conservation Service (NRCS) has provided technical engineering assistance in the evaluation of the above alternatives. The Selected Project The DLC has decided to replace the earth ditch with a concrete ditch. The canal lining will be approximately 7900 feet in length and will involve renovation or rebuilding of 5 control structures in conjunction with the installation of 8 turnouts. The new ditch will have a design capacity of 35 cfs, of which 21 cfs will be for delivery of irrigation water, and the remainder to handle storm runoff. The NRCS Project Report and preliminary design are included in Appendix B. . Feasibility Study Rehabilitation of the Lower Decker Lateral July 1997 5