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I I I I I I I I I I 9 It is believed that construction and project costs presented above are reliable for 1970; however, operation and maintenance costs, which are shown below shoald be adjusted on an annual basis to reflect costs of labor and matsrial to ll'erate and maintain the system after constraction is completed. 1 man full time @ 8600/mo. 1 man half time @ 8400/mo.. Eqnipment rental 82000/1r. Me teria Is $2000/yr. Pickup, 20,000 miles/yr @ 12~/mi Total Annual Operating Cost - 7,200.00 a 2,400.00 ::: 2,000.00 a 2,000.00 a 2,400.00 = $16,000.00 As the District is already committed to operation and maintenance of the Norton Drain these costs have been included above. It is believed that the same men, materials and equipment can care for both projects. Conclusions While no contact has been made with personnel of the Monte Vista National Wildlife Refuge it might be expected that any resnlt of channelization which might adversely effect that operation will be strongly opposed by them. Also, while the production of water logged land, and the results of inadequate drainage and ponding are apparent, it may be very difficult to convince adjacent land owners and water users of these facts unless they can be assnred that their rights will be protected. This situation may pose problems that are difficult to solve. At this time it appears that a reasonable solution might be to install a check and diversion structure at each decreed point of diversion so that each valid senior water right can be operated as the owner wishes. Eleven such structures are included in the cost estimate. If this solution is mutually acceptable to the land owners and the District, some agreement should be entered into permitting the land owners to operate the checks only during the growing season. The District must control the checks throughout the year when there is any danger of freezing. In this respect the water users shoald control the checks for the shortest possible period to assure the District of a maximum benefit from the project. The estimated cost of the project allows for the elimination of problems that developed during construction of the Norton Drain. This should result in a more satisfactory operation of the system. The total cost of the project is quite high and it may be desirable to proceed on a stage construction basis. If such a decision is made it is suggested that the first stage be from the Rio Grande to U.S. Highway 285, a distance of 6.91 miles. The prorated estimated cost of this stage is $246,800. 0576