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<br />I <br />I <br />I <br />I <br />, <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />, <br />I <br />I <br />I <br /> <br /><:) <br />c:1) <br />~ <br />CJl <br /> <br />-220- <br /> <br />r <br /> <br />some energy efficient frost control benefits which would not <br />be available under trickle irrigation. The sprinklers would <br />have to be designed for the low intake capacity of the <br />Mancos shale soils, but could greatly increase the irriga- <br />tion application efficiency, which is presently estimated by <br />the ses around 20-35 percent for these areas. In addition, <br />a central pressurized pipeline system would eliminate the <br />seepage losses from the many small and often parallel canals <br />and laterals which often flow relatively long distances to <br />irrigate a few hectares. <br />Uncompahgre Valley-- <br />The WPRS (USDI, WPRS, 1980c) has developed a preliminary <br />lining program for 540 kID of the total 830 kID of canals and <br />laterals in the Uncompahgre River area, which covers the <br />area from the towns of Montrose to Delta. Approximately <br />160 km of the linings are located on the "adobe" or Mancos <br />areas on west side of the Uncompahgre River. WPRS Project <br />personnel are estimating that with the selected program the <br />salinity at Imperial Dam would be reduced by about 20 mg/l <br />or 220,000 Mgm which is 63 percent of the total agricultural <br />salinity contribution from the Uncompahgre Project area. <br />Although this is only an appraisal study, these estimates of <br />salt reduction due to canal and lateral linings even with <br />winter diversions, appear to be much higher than results <br />from other Mancos shale salinity control areas might indi- <br />cate. This is the result of the incorrect "incremental <br />cost-effectiveness" methodology used, and which is strongly <br /> <br />, <br />