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<br />MAY lQB2 <br /> <br />TABLE I-I SUMMARY OF ANNUAL SALT LOADING AND POTENTIAL REDUCTION <br />ATTRIBUTED TO IRRIGATED AGRICULTURE. <br />McELMO CREEK SALINITY CONTKOL STUDY, COLORADO. <br /> <br />Source of Loading Present! ' Plan Number <br /> I 1 I 2 - 3 I 4 I 5 I 6 <br /> -------------- ---- -tons------ -- ---------- <br />Group Ditches 8UOC 900C 8000 C ( C U <br />OnFarm Ditches 2/3/ 14UOU 1500C 1500( 14000 300( 2000 U <br />Deep Percolation - - 3200( 36000 2400( 2200C 20000 2000C 33uOO <br />Totals 54000 6000C 47000 3600C 23000 2200C 33000 <br />Potential for Reduction <br />Group Ditches --- -lOOt l BOOl 800C BOOC BUOU <br />OnFarm Di tches --- -lOOt -1000 ( 11000 1LOOO 14000 <br />Deep Percolation --- -4000 BOOO 1000C 1200( 12000 -1000 <br />Sub-Total ::"1 --- -6000 700C 1800( 3100( 32000 21000 <br />Potential for Prevention <br />Irrigation 600C 600C 600C 600( <br />Water Management --- --- 0 <br />Total Salt Reduction --- -600l 13 000 2400 37000 3BOOC 210UO <br /> <br />l.!Plan 2 is the Management Only Plan and will have little effect on reducing <br />salt loading from ditch seepage. The plans are further described in <br />section 5. <br />liThe present case and Plans 1 and 2 include 5,000 tons/year from Navajo <br />Wash, a separate tributary to the San Juan River. <br />3/Plans 3, 4 and 5 include about 2,000 tons/year from Navajo Wash. <br />~/Reduced salt load going to the Colorado River. Plans 2 through 5 will have <br />an additional 6,000 ton prevention benefit due to management of supplemental <br />irrigation water available from the Dolores Proj ect. <br /> <br />Local benefits resulting from these improvements will be reflected in <br /> <br />reduced costs of production, improved irrigation systems and increased crop <br /> <br />yields. However, these improvements also may adversely impact the 11,000 <br /> <br />acres of wetland that have developed as a result of introducing irrigation <br /> <br />into the valley. <br /> <br />001820 <br /> <br />1-3 <br />