TABLE 1.—Annual costs and benefits (1946 prices) Annual costs Operation, maintenance and replacements: Irrigation (including domestic water systems) Navigation Flood control Allowance for amortization of all construction costs in 50 years with interest at 3 percent per annum Annual benefits: Irrigation Power Flood control Navigation Wildlife 1 Domestic water-- Pollution abatement Ratio of benefits to costs . 1 Benefits to fish have not been evaluated. 2 Not estimated. TABLE 2.—Costs and repayment—Ultimate development under basin repayment plan Costs: Total estimated construction costs (1946 prices) 1 $5, 939, 765, 000 Less nonreimbursable allocations Flood control 2 $516, 576, 000 Navigation 3 277, 188, 000 Pollution abatement 3, 859, 000 Wildlife 98, 920, 000 Total nonreimbursable costs . 896, 543, 000 Total reimbursable costs 5, 043, 222, 000 Made up of $5.598.484,000 for potential developments plus investment in existing power projects included under the basin repayment plan (Bonneville Dam, Grand Coulee Dam, and Bonneville-Coulee transmission system). 2 Made up of $515,576,000 for potential developments and $1,000,000 for Grand Coulee Dam. Made up of $252,073,000 for potential developments and $25,115,000 for Bonneville Dam. TABLE 2.—Costs and repayment—Ultimate development under basin repayment plan—Continued Repayment : By domestic water users____ $14, 500, 000 By irrigation water users: 4 New land 314, 533, 000 Supplemental water___ 57, 124, 000 Total repayment by water users $386, 157, 000 Balance to be repaid from power revenues__ 4, 657, 065, 000 Gross power revenues__5 8, 694, 695, 000 Less operation, maintenance and replacement costs 3, 444, 042, 000 Net power revenues 5, 250, 653, 000 Surplus of estimated revenues over reimbursable costs 593, 588, 000 4 50-year repayment period. Made up of $7,334,600.000 from potential developments plus revenues from existing power projects included under the basin repayment plan. A 50-year revenue period has been used for all of the potential developments and a 75-year period in the ease of the existing projects. 6 Although replacements are here included with operating costs, recommendations of this memorandum involve the addition of replacements to capital costs chargeable to the account. TABLE 3.—Costs and repayment—Projects recommended for authorization Costs: Total estimated construction costs (1946 prices) ----$179, 572,000 Flood control $1, 431, 000 Navigation 0 Pollution abatement (1) Wildlife 7, 267, 000 Total nonreimbursable costs 8, 698, 000 Total reimbursable costs 170, 874. 000 Repayment : By domestic water users 0 By irrigation water users : 2 New land $24, 165, 000 Supplemental water 3, 549, 000 Total $27, 714, 000 Total repayment by water users 27, 714, 000 Balance to be repaid from power revenues 143, 160, 000 Gross power revenues 184, 669, 000 Less operation, maintenance, and replacement costs 47, 645, 000 Net power revenues 137, 024, 000 To be paid out of pooled revenues from basin-wide power developments 6, 136, 000 I Not estimated. 2 50-year period. 3 Revenue periods as shown in table 4. All projects in comprehensive plan $58, 125, 000 12, 604, 000 1, 569, 1, 365, 000 217, 613, 000 291, 276, 000 203, 664, 000 146, 692, 000 20, 089, 000 9, 798, 000 3, 845, 000 1, 120, 000 150, 000 385, 358, 000 1. 32 to 1. 00 Projects recommended for authorization $1, 129, 000 1, 086, 000 0 2, 000 6, 980, 000 9, 197, 000 13, 534, 000 2, 720, 000 56, 000 0 296, 000 0 (2) 16, 606, 000 1. 81 to 1. 00
