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<br /> TABLE IV-l S~~ARY OF ALTERNATIVE PLANS 6/ <br /> LOWER GUNNISON SALINITY CONTROL STUDY, COLORADO <br /> Plan Description -Wetland Mitigation- <br /> Action Total Net 5/ Area Salt Average 5/ Area Area <br /> Cost Benefit Treated Reduction Cost Disturbed Avo ided <br /> (----$1,000,000----) ( acres) (1000 tons)($1000/mg/l) (acres) (acres) <br /> 1. Continuation of Ongoing Onfarm 2.5 0.41 3,400 10 213 <br /> Programs Mitigation 1.7 -0.21 840 370 37,030 <br /> Total 4.2 0.20 4,240 10 358 370 37,030 <br /> 2. Irrigation Water Mgmt . Onfarm 7.1 2.08 55,900 35 173 <br /> Minimum Level - Off-farm 1/ 0 0 0 0 0 <br /> Selected Areas Mitigation 3.4 -0.43 1,700 750 36,650 <br /> Total 10.5 1.65 57,600 35 256 750 36,650 <br /> 3. Onfam Ditch Lining Onfarm 30.0 3.25 35,800 95 269 <br /> Minimum Level - Off-farm Y 16.6 1.20 45 314 <br /> Selected Areas Mitigation 6.1 -0.76 3,000 1,300 36,100 <br /> Total 52.7 3.69 38,800 140 321 1,300 36,100 <br /> 4. Irrigation Water Mgm~. Onfarm 51.8 4.22 43,800 150 294 <br /> & Onfarm Ditch Lining Off-farm 2/ 26.4 0.64 55- 409 <br /> Minimum Level - Mitigation 1.8 -0.23 900 400 37,000 <br />H Selected Areal~ Total 80.0 4.63 44,700 205 332 400 37,000 <br /><: 5. Irrigation Water Mgmt. 7/ Onfarm 68.6 5.70 41,400 190 308 <br />I <br />N & Onfarm Ditch Lining Off-farm '}j 20.9 0.61 45 396 <br /> Maximum Level - Mitigation 14.6 -1.82 7,300 3,100 34,300 <br /> Selected Areas Total 104.1 4.49 48,700 235 377 3,100 34,300 <br /> 6. Irrigation Water Mgmt. Onfarm 3/ 124.0 12.43 117,100 295 358 <br /> & Onfarm Ditch Lining Off-farm 21.5 0.53 45 407 <br /> Mixed Levels - Mitigation 27.4 -3.42 13,700 5,900 31,500 <br /> Selected. Areas Total 172.9 9.54 130,800 340 433 5,900 31 ,500 <br /> 7. Irrigation Water Mgmt. Onfarm 3/ 139.7 10.23 169,000 300 397 <br /> & Onfarm Ditch Lining Off-farm 12.1 1.00 35 392 <br /> Mixed Levels-Valleywide Mitigation 17 .6 -2.20 8,900 --- 3,800 33,600 <br /> Total 169.4 9.03 177 ,900 335 431 3,800 33,600 <br /> 8. Irrigation Water Mgmt. Onfarm 3/ 291.2 2.81 169,000 370 670 <br /> & Onfarm Ditch Lining Off-farm 23.4 0.66 SO 399 <br /> Maximum Level-Valleywide Mitigation 44.1 -5.50 22,000 4/ 13 ,200 24,200 <br /> Total 358.7 -2.03 191,000 420 727 13,200 24,200 <br /> 1/ Off-farm ditch lining is not included with this program emphasizing onfarm irrigation water management only. <br /> 2/ These off-farm actions include lining small and medium laterals included in maximum salt reduction analyses. <br /> 3/ A limited amount of off-farm ditch lining is included with maximum level onfarm improvements to assure proper <br /> operation of onfarm system improvements. <br /> 4/ Includes 18,300 acres of avoided habitat and 3,700 acres of new habitat development.' <br /> 5/ Costs based on July 1980 price base, amortized at 7 3/8 percent interest over 25 years. <br /> 6/ Benefits and costs were computed in present value terms using 10-year installation period. <br /> TI Onfarm benefits not included. <br /> <br /> <br />---------- <br />