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1 and (7) all associated facilities including roads, railroad 2 spur, and transmission lines.

3 (2) The desalting plant shall be designed to reduce the 4 salinity of approximately one hundred and twenty-nine mil5 lion gallons a day of drain water by a membrane process using 6 advanced technology commercially available. The plant shall 7 effect recovery initially of not less than 70 per centum of the 8 drain water as product water, and shall effect reduction of 9 not less than 90 per centum of the dissolved solids in the 10 feed water. The Secretary shall use sources of electric power 11 supply for the desalting complex that will not diminish the 12 supply power to preference customers from Federal power 13 systems operated by the Secretary. All costs associated with 14 the desalting plant shall be nonreimbursable. 15 (c) Replacement of the reject stream from the desalt16 ing plant and other drainage waters bypassed to the Santa 17 Clara Slough, at such times as surplus deliveries would not 18 otherwise be made to Mexico, is recognized as a national 19 obligation. The Secretary shall conduct studies to be com20 pleted not later than June 30, 1980, providing for adequate 21 replacement water.

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(d) The Secretary is hereby authorized to advance funds 23 to the United States section, International Boundary and 24 Water Commission (IBWC), for construction, operation, 25 and maintenance by Mexico pursuant to minute numbered

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1 242 to the Mexican Water Treaty of February 3, 1944, of 2 that portion of the bypass drain within Mexico. Such funds 3 shall be transferred to an appropriate Mexican agency, under 4 arrangements to be concluded by the IBWC providing for 5 the construction, operation, and maintenance of such facility 6 by Mexico.

7 (e) Any desalted water not needed for the purposes 8 of this Act may be disposed of at prices and under terms 9 and conditions satisfactory to the Secretary and the pro10 ceeds therefrom shall be deposited in the General Fund of 11 the Treasury.

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(f) For the purpose of reducing the return flows from 13 the division to one hundred and seventy-five thousand acre14 feet or less annually, the Secretary is authorized to:

(1) Accelerate the cooperative program of Irrigation Management Services with the Wellton-Mohawk irrigation and drainage district, hereinafter referred to as the district, for the purpose of improving irrigation efficiency. The district shall bear its share of the cost of such program as determined by the Secretary.

(2) Acquire, by purchase or through eminent domain or exchange, to the extent determined by him to be appropriate, lands or interests in lands to reduce the existing seventy-five thousand irrigable acres authorized

by the Act of July 30, 1947, (61 Stat. 628) known

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as the Gila Reauthorization Act. The initial reduction

in irrigable acreage shall be limited to approximately ten thousand acres. If the Secretary determines that the irrigable acreage of the division must be reduced below sixty-five thousand acres of irrigable lands to carry out the purpose of this section, the Secretary is authorized

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to acquire additional developed irrigable lands, as may be deemed by him to be appropriate.

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(g) The Secretary is authorized to dispose of the 10 acquired lands and interests therein on terms and conditions 11 satisfactory to him and meeting the objective of this Act or 12 to retain such lands for fish, wildlife, or other appropriate 13 purposes.

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(h) The Secretary is authorized, either in conjunction 15 with or in lieu of land acquisition, to assist water users in the 16 division in installing system improvements, such as ditch 17 lining, change of field layouts, automatic equipment, 18 sprinkler systems, and bubbler systems, as a means of in19 creasing irrigation efficiencies: Provided, however, That all 20 costs associated with the improvements authorized herein 21 and allocated to the water users on the basis of benefits 22 received, as determined by the Secretary, shall be reimbursed 23 to the United States in amounts and on terms and conditions 24 satisfactory to the Secretary. All costs associated with im25 provements that will enable water users to meet applicable

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water quality requirements of State and Federal law shall 2 be the responsibility of the water users under financial 3 criteria established by law.

4 (i) The Secretary is authorized to amend the contract 5 between the United States and the district dated March 4, 6 1952, as amended, to provide that—

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(1) the portion of the existing repayment obligation owing to the United States allocable to irrigable acreage eliminated from the division for the purposes of this Act, as determined by the Secretary, shall be nonreimbursable; and

(2) if deemed appropriate by the Secretary, the district shall be given credit against its outstanding repayment obligation to offset any increase in operation and maintenance assessments per acre which may result from the district's decreased operation and maintenance base, all as determined by the Secretary.

(j) The Act of July 30, 1947 (61 Stat. 628), is hereby 19 amended to reduce the authorized irrigable acreage of the

20 division as provided in section 201 (e) herein.

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(k) The Secretary is authorized to acquire through 22 the Corps of Engineers fee title to, or other necessary in23 terests in, additional lands above the Painted Rock Dam in 24 Arizona that are required for the temporary storage capacity 25 needed to permit operation of the dam and reservoir in times

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of serious flooding. The Secretary is also authorized, in con2 junction with the Corps of Engineers, to adopt other con3 trol measures below the dam to permit the United States 4 to comply with its obligations under minute numbered 242. 5 No funds shall be expended for acquisition of land or inter6 ests therein until it is finally determined by a Federal court 7 of competent jurisdiction that the Corps of Engineers pres8 ently lacks legal authority to use said lands for this purpose. 9 Nothing contained in this Act nor any action taken pursuant 10 to it shall be deemed to be a recognition or admission of any 11 obligation to the owners of such land on the part of the 12 United States or a limitation or deficiency in the rights or 13 powers of the United States with respect to such land or 11 the operation of the reservoir.

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(1) To the extent desirable to carry out sections 101 (f) 16 (1) and 101 (h), the Secretary may transfer funds to the 17 Secretary of Agriculture as may be required for technical 18 assistance to farmers, conduct of research and demonstration 19 and such related investigations as are required to achieve 20 higher onfarm irrigation efficiencies.

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(m) All cost associated with the desalting complex shall 22 be nonreimbursable except as provided in sections 101 (f)

23 and 101 (g).

SEC. 102. (a) The Secretary is authorized to construct

a new concrete-lined canal or to line the presently unlined