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~'/~~ 77 ~~.~7 7{U 7~~ UUJ{ UHnr!~~U r~H urr --/U(ULJ~J ry. ULJUJ EXHIBIT 1 S.~T DIVERSION COLORADO RIVER DIVERSION DEMONSTRATION PROJEcr B? BOOK C~IFF SOIL CONSERVATION DISTRICT AND SILT ~TER CONS8RVANC~ DISTRICT . INTRODUCTION The exi6tin~ diversion in the river carries water to a pumping station and consists of an earthen =no gravel embankment that extends 600 feet into the Colorado River. The structure is very vulnerable to seasonal floodin~ and is rebuilt On an annual basis. It is proposed that this system be =eplaced with a concrete, rock diver$ion and headgate structure in a side channel approximately 1,000 feet upstream from the present point of diveraion to a more manageable location. The water will be conveyed in 940 feet of 42' HOPE low head irrigation pipe carrying 40 cfs of irrigation water back to the original diteh system. The new diversion will use current technology to reduce erosion, to increase river stability, to improve aquatic habitat, and improve river bank ve~etation. The new diversion will illustrate an alternative to the old sYEtem of having to annually e~ter the river which created damage to the river system. Benefits achieved from the installation of the new structure could be a point of interest since the site is easily accessible from 1-70, The Silt COnservancy District has spent a lot of money in the past few years repairing and replacing structures in their system so they don't have a lot of e~tra money for this projectl therefore they are in need of $100,000 in the form of grant money or loans. . The new diver~ion 18 expaoted to improve the District' $ ~ility to control water oiverted from the Colorado River, re~~ce the co~t of maintenance, and reduce envi~onmental disturbanoe in the Colo~ado River caused by annual m$intenance to the existing gravel diversion structure. It will also insure a better water source for the 1500 acres that the water irri~ates. The proposed project is located in the north west quarter of section 12, Township 5 South, Range ~2 West. It is 1 and 1/2 miles eest of Silt, Colorado at approximately 5,343 feet above sea level. The site is aecessible by road. The approximate time table for the project i. as follows, 10-199~ thru 02-1999 survey and design (completed), 07.1997 thru 12-1999 administrative procedures to be done, 02-2000 thru 04-2000 construction to start. The Natural Resource Conservation Service will be r~sponsible for providing technical assistance for the design and construction of the project features which include but may not be limited to, a rock and concrete diversion dam, concrete head~ate structures and appurtenances; and water conveyance methods such as pipeline or open channel. They will assist the Bureau of Recla~tion and the Silt Conservancy District in obtaining ccnstruceion easements tor implementation of the project. We are planning to apply new innovati~e featuree to this project. HDPB low head polyethylene irrigation pipe for larie flow. will be used. Since this pipe is a new type of plastic pipe, it. long time durability will be monitored for tuture applications. .