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<br />SUMMARY OF CANDIDATE PLANS 6/
<br />LOWER GUNNISON SALINITY CONTROL STUDY. COLORADO
<br />
<br />Plan Description
<br />
<br />Action
<br />
<br />1. Continuation of Ongoing
<br />Programs
<br />
<br />~Irrigation Water
<br />Minimum Level -
<br />Selected Areas
<br />
<br />Mgmt.
<br />
<br />3. Dufano Ditch Lining
<br />Minimum Level -
<br />Selected Areas
<br />
<br />8.~rigation Water Mgmt.
<br />& Onfarm Ditch Lining
<br />Maximum Level-Valleywide
<br />
<br />11
<br />21
<br />1/
<br />
<br />'!/
<br />51
<br />61
<br />!./
<br />
<br />Area
<br />Treated
<br />(acres)
<br />3,400
<br />840
<br />4,240
<br />55,900
<br />o
<br />1,700
<br />57,600
<br />35.800
<br />
<br />3,000
<br />38,800
<br />43,800
<br />
<br />900
<br />44.700
<br />41,400
<br />
<br />13,700
<br />130,800
<br />170,900
<br />
<br />Wetland
<br />Salt Average ~ Area
<br />Reduction Cost Disturbed
<br />(1000 tons)($1000/mg/l) (acres)
<br />10 213
<br />
<br />10
<br />35
<br />o
<br />
<br />35
<br />95
<br />45
<br />
<br />140
<br />150
<br />55
<br />
<br />205
<br />190
<br />45
<br />
<br />235
<br />295
<br />45
<br />
<br />340
<br />265
<br />55
<br />
<br />Mitigation
<br />Area
<br />Avoided
<br />(acres)
<br />
<br />358
<br />173
<br />o
<br />
<br />370
<br />370
<br />
<br />37,030
<br />37,030
<br />
<br />Total Net 5/
<br />Cost Benefit
<br />(----$1,000,000----)
<br />Onfarm 2.5 0.41
<br />Mitigation 1.7 -0.21
<br />Total 4.2 0.20
<br />Onfarm 7.1 --2.08
<br />Off-farm l/ 0 0
<br />Mitigation 3.4 -0.43
<br />Total 10.5 1.65
<br />Onfano 30.0 3..25
<br />Off-farm 21 16.6 1.20
<br />Mitigation 6.1 -0.76
<br />Total 52.7 3.69
<br />4. Irrigat:ion Water Mgmt. Onfarm 51.8 4.22
<br />& Onfarm Ditch Lining Off-farm ~ 26.4 0.64
<br />Minimum Level - Mitigation 1.8 -0.23
<br />Selected Areas Total 80.0 4.63
<br />5. Irrigation Water Mgmt. 7/ Onfarm 68.6 5.70
<br />& Onfarm Ditch Lining Off-farm 3/ 20.9 0.61
<br />Maximum Level - Mlti~ation 14.6 -1.82 7,300
<br />Selected Areas Total 104.1 4.49 48,700
<br />6. Irrigation Water-Mgmt. -Onfarm 3/-----i24.0 12~117 ,100
<br />& Onfarm Ditch Lining Off-farm 21.5 0.53
<br />Mixed Levels - Mitigation 27.4 -3.42
<br />Selected Areas Total 172.9 9.54
<br />7. Irrigation Water Mgmt. Onfarm 3T---149.1 5.45
<br />& Onfarm Ditch Lining Off-farm 36.6 -0.76
<br />Mixed Levels-Valleywide MitiKation 17.6 -2.20 8,900
<br />Total 203.3 2.49 179,800 320 541
<br />On farm 'if 291.2 2.81 170,900 370 670
<br />Off-farm 23.4 0.66 50 399
<br />Mitigation 44.1 -5.50 22,000 4/ 13,200 24,200
<br />Total 358.7 -2.03 192,900 420 727 13,200 24,200
<br />Off-farm ditch liniQg is not included with this program emphasizing o~farm irrigation water management only.
<br />These off-farm actions include lining small and medium laterals included in maximum salt reduction analyses.
<br />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 />Includes 18,300 acres of avoided habitat and 3,700 acres of new habitat development.
<br />Average annual values based on July 1980 price base, amortized at 7 3/8 percent interest over 25 years.
<br />Benefits and costs were computed in present value terms using la-year installation period.
<br />Onfarm benefits not included.
<br />
<br />256
<br />269
<br />314
<br />
<br />750
<br />750
<br />
<br />36,650
<br />36,650
<br />
<br />321
<br />294
<br />409
<br />
<br />1,300
<br />1,300
<br />
<br />36,100
<br />36,100
<br />
<br />332
<br />308
<br />396
<br />
<br />400
<br />400
<br />
<br />37,000
<br />37,000
<br />
<br />377
<br />358
<br />407
<br />
<br />3,100
<br />3,100
<br />
<br />34,300
<br />34,300
<br />
<br />433
<br />479
<br />567
<br />
<br />5,900
<br />5,900
<br />
<br />31,500
<br />31,500
<br />
<br />3,800
<br />3,800
<br />
<br />33,600
<br />33,600
<br />
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