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--.:J ~ Table 2 -- Analysis of Recreational Use Improvement Options ~1'~'~I~IWlJII ..,. YffiM I:Nt# R-IO R-Il R,I2 R,13 Refill Right Dredge Aifle Gap Reservoir Pump to Fie canal Grand Tunnel Ditch IGTD) Water Salvage (a.k.a. Lee Aoy Pump) Fo\lowing an initial fill of RG and use of that water, subsequent inflow could be stored. Wifhout such a right, water rights junior to RG's 1951 right will ba able to prevent additional storage or use by the Silt Pro'ect. Dredge the reservoir to add . storage space and recover lost storage due to sediment deposition. Pump CO River water to a location higher on Silt Mesa to serve additional lands. This would allow less water to be divarted from Rifle Cr. & Harvey Gap and allow more storage in RG -reservoir. At a point about 1.2 miles below the GTD headgata, pump 2 to 4 cfs of return flow from Rifle Creek back into the GTD, thus reducing the need to release same amount of water from RG Difficult to quantify without comprehensive study of records. Likely to have minimal impact on pool levels as right may not yield "wet waterll". & This option would not directly increase the reservoir levels and could actually decrease them in the year the water is stored. . However. this additional water could be carried over to enhance d ear reservoir levels. This plan option was analyzed to provide about 10 c1s. At this rate, it could result in additional storage in Rifle Gap of up to 2,000 al. Assuming a pumping rate of 2 cfs, this could allow 800 al to b. retained in RG Reservoir annually. CWCS instream flow right for 9 cfs in summer. 5 cfs in winter. 25 Legal costs to file and obtain decree could be in excess of $30.000. Estimated costs range lrom $1,200 to 2,500 per al per year based on $10- 20/cy excavation cost; includes haul and disposal. - Est. Construction cost = $1,169,000 Pumping cost for about 1.5 million kWh per year = $81,000. Total Annual cost inclUding O,M&R - $207,000 or $103/af/yr. - Capital costs = about $40,000. - Annual cost = $6,500 including power costs (from PSCD) OR about $8/aflyr. - Refill could be used to replace evaporation losses. . Primary benefit may be to protect storage of currently II"free" water from future water developments. such as upstream storage. - May require an addttional water right. & Ability to dry out work area would significantly affect the cost of this option. - 1,613 cy of excavation equals 1 af of storage space. - Aeeume dredging would teke place ebove the top elevation of the inactive pool in the reservoir. & New water rights would be required (cost not included) - Lnt would be 350 leet. - Pipe langth would be about 2 miles. . No cost has been included for replacement water so diversions could continue during a malnstem Colorado River call. May be able to use Green Mtn. allocation. . A water right application for this option was filed bva private individual; however, the water court dismissed the case in October 1993. - Would water quality of the pumped return flow be an issue?