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<br /> <br />w <br />l\.) <br /> <br />.~ <br />-. <br /> <br />o <br /> <br />that a s::radual ri se in the salinity of the river was occurring as the <br /> <br />water resources were developed. <br /> <br />Salt-concentrating effects were produced by evaporation, transpira_ <br /> <br />tion, and diversion of high quality water out of the basin. Also. <br /> <br />salt-loading effects occurred throu~h the addition of dissolved <br /> <br />solids to the river system from both natural and manmade sources. <br /> <br />Because of the wide fluctuations in concentration from natural causes, <br /> <br />the developments on the river. particularly the lar~e reservoirs. pro- <br /> <br />duced offsetting beneficial effects by minimizing these fluctuations. <br /> <br />Prior to their authorization, it was known that the Colorado River <br /> <br />Storage and Participating Projects. ~avajo Indian ITTi~ation Project, <br /> <br />San Juan-Chama Project. and the FryinRPan-Arkansas Project would <br /> <br />cause sip,nificant increases in salinity levels. This was expected <br /> <br />to arise primarily from the increased consumptive use of water and <br /> <br />transport of hi~h quality water out of the basin. Recoenizinr. the <br /> <br />concern of the Colora.do River water users, ConRT'ess stipulated that <br /> <br />studies be made of the water quality in the basin and that control <br /> <br />plans be developed. The stipulation was expressed in the authoriz- <br /> <br />5 <br /> <br /> <br />ing legislation for the projects. <br /> <br />As a result of the legislative requirements. a basic network of water <br /> <br />quality stations was established at principal points throughout the <br /> <br />Colorado River Basin. Analyses and studies were begun for the entire <br /> <br />