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<br />m <br />...... <br />to <br />( " <br />c <br />c. <br /> <br />-2- <br /> <br />A general 'discussion of Colorado water rights and the <br />operation of the Colorado River has been included to provide <br />a frame of reference for a description of the methods <br />available for compensating the river system for depletions <br />related to salinity control. Appendix A contains tabular data <br />describing decreed water rights on the Colorado River by <br />reach from Dotsero to the Utah state line. Water rights with <br />spring sources in the study area are tabulated and mapped in <br />Appendix B. <br /> <br />Basic Assumptions <br /> <br />Certain basic assumptions have been made relative to the <br />components of the seven alternatives that affect the <br />quantity, location and timing of depletions. These <br />assumptions are described below and are based on information <br />received from URS. It is believed that the basic assumptions <br />result in reasonable estimates of consumptive use, but it <br />should be recognized that the alternative designs are <br />preliminary and that changes in the basic components and <br />assumptions could have a significant effect on the assumed <br />values of consumptive use., <br /> <br />Collection. Three collection methods have been presented <br />among the seven alternatives. These are mouth collection, <br />surface collection and alluvial wells. Surface collection and <br />mouth collection are essentially the same from a water rights <br />view. The volume of water collected would be about the same <br />as the volume necessary to produce a given amount of salt. <br />The annual diversion volumes have, therefore, been assumed to <br />be those shown in the working paper. Collection by alluvial <br />wells, however, could result in the collection of mixed <br />alluvial and saline spring water, which would dilute the <br />salinity of the water collected and increase the volume of <br />water diverted to collect the same volume of salt. The <br />efficiency of the collecting wells will vary with the well <br /> <br />.' <br /> <br />G) <br /> <br />Leonard Rice Consulting Water Engineers, Inc. <br />