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I I I I I I I I I I I I I 'I I II I I I reason, demand. purchase project. the Districts would still need water rights for the full A combination of lease, purchase, and options to would be required for water rights even with the The availability of water rights is the key item in whether or not the La Plata River is a realistic alternative. The evaluations herein indicate that the La Plata River is a good alternative if the rights can be obtained, and that it is worth further investigation to determine if rights are available. On the other hand, if rights are not available or the price is substantially greater than estimated, which is possible, the plan will become infeasible. Subsequent negotiations for water rights have shown that rights can be purchased at about the estimated cost. The main problem at the date of this report is the changes that may occur during the court proceedings to transfer the water. The alternative with the shortest pipeline is shown as Route B on Figure IV-A. The pipeline would start about one mile downstream from the location of the headgate for the Hay Gulch Ditch and would go directly east to a point near Durango West. A pump would be located at the diversion point and a small diversion structure would be required. The outlet of the pipeline would be into the treatment plant at about elevation 7,750 feet, so that water can be conveyed by gravity directly into the storage tanks used by the Districts. The cost estimate for this plan is shown on Table IV-B. The alternative with no pumping is shown as Route C and would involve a pipeline beginning at the headgate for Hay Gulch Ditch and running south along the highway then east along the gravel county road then northeast across country to a point near the south storage rank. A treatment plant would be located at that point. The costs are shown in Table IV-C and are slightly greater than the shortest route because of the construction cost of the longer pipeline. The alternative, Route A, of diverting water from the river upstream from the highway has two variations: (1) A surface diversion that requires a treatment plant as described in the above alternatives; and (2) subsurface collection which would theoretically not require a treatment plant. Both methods of diversion would involve a pipeline constructed along Highway 160 to Durango West. The surface diversion would require a diversion dam with a 120 foot pump lift. A treatment plant would be located at the Durango West end of the pipeline. The cost estimate for the plan with the treatment plant is shown on Table IV-D. The wells, There time, subsurface collection would involve a system of shallow 40 to 60 feet deep in the alluvium north of the highway. is no data to evaluate the subsurface collection at this but data would be necessary before it could be considered - 17 -