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( \, APPE~mIX E Wheel Gap, Coller and Gerrard. Development of hydroelectric power was studied at each site in various combinations with upstream possibilities. It was found that no eombination furnished a desirable plan of develop- mente Further studies led to the selection of a plan consisting of a dam and reservoir at the Wagon Wheel Gap site with a 50,000 kw hydroelectric plant and a small afterbay at the Coller site. It was later recommended that consideration be given to locating the afterbay at the Cottonwood Cove site, should this be possible at no additional cost. The Cottonwood Cove site was more desirable by reason of location, being closer to Wagon Wheel Gap, and would permit more efficient regulation of peaking power releases. StudY 6 Study 6, the water supply study for the Rio Grande and Wem1- nuehe Pass Divisions Report of 1953, is ineluded in Appendix D _ Plans Considered, and oombined operations for flood control, irrigation, power produetion and eomplianee with the Rio Grande Compaet. The C;onejos Divi- sion, with 60~000 aere-feet storage at Platoro Reservoir, was operated separately from the Rio Grande Division, and abided by te1'lDS of the Compact. Power was generated by a 50,000 kw pOwer plant at Wagon Wheel Gap. To smooth out winter power releases, an afterby at Coller was neeessary. Wagon Wheel Gap Dam am Coller Afterbay were the only featuras on the Rio Grande in Colorado that were considered. The Wagon Wheel 'Gap Reservoir eapacity was 1,050,000 aere-feet, with 60,000 aere-feet inviolate flood eontrC'1 storage. Coller ilfterbay capacity was 1,000 aere-feet. The major upstream reservoirs, having a total capacity of approximately 120,000 aere-feet, were considered to operate as they did historically, as they are not effeeted by the Rio Grande Compact. Parameter curves were used to foreeast required evaeuations from Wagon Wheel Gap Reservoir in order to control flows at Del Norte and Alamosa to 4,000 cubio feet per/second and 1,500 cubic feet per' second, respectively. ' A daily flood control operation was made to evaluate the flood control, benefits in ColC'rado and New Mexico. The, otowi gage was the oon- trol point for New Mexico with the critical flow being 5,000 cubie feet per second, or more. . o. . ." .. .. ....... '. , :. . :'The sfudy Was inoCli-Po;~t"ed',in 'a' ;eport' a~d sent to: the' 'stat~s . .of'ColoradC', New MexicG ana Texas, and agencies of the FIARBC for comments. The comments received from ColOrado, New Mexico and Texas are summarized as follows: State of Colorado ,..., .... ~ ~.: ' ,. , A. Comments 'J. ... vi: .., ~/ 1. Plan not 'most economical that can be conoeived for the area. i L.n E-25 '