PUBLIC LAWS-CH. 861-OCT. 14 , 1940 Pederaloperation. Suspension for non- payment of charges. Spread of certain repayments. Date of first install- ment. Proviso. Provisions not af- fected. Accounting. Delinquencies i n payments, penalties. Size of farm units of irrigable lands. Proisoe. Provision not ap- plicable to U. S . Transfer or disposal of land in project area. Delivery of water under prior rights. Cooperative reha- bilitation program. tary to irrigation; and collections of such charges in excess of the cost of the operation and maintenance during the development period, as thereafter determined by the Secretary, shall be credited to the reimbursable construction costs of the project in the manner deter- mined by the Secretary. "(2) The United States shall operate and maintain the project during the development period fixed for it. After the development period, the United States shall operate and maintain the project or any part thereof as long as is deemed necessary by the Secretary, and shall be paid in advance for each year that part of the estimated cost of operating and maintaining the project for such year allocated by the Secretary to irrigation. In the event charges due the United States are not paid when due the United States may, at its election, suspend operations in whole or in part. "(3) The repayment of the reimbursable construction costs, except as to Indian lands which shall be repayable in accordance with exist- ing law relating to Indian lands, shall be spread in not to exceed forty annual installments, of the number and amounts fixed by the Secretary; and the first annual installment under each contract shall become due and payable on the date fixed by the Secretary, in the year next following the last year of the development period fixed under subsection (c) (1): Provided, That the provisions of this subsection shall not be construed to modify the provisions of special legislation pertaining to any particular project. " (4) The water users or their organization will take such measures as the Secretary deems proper to secure the adoption of proper accounting, to protect the condition of project works, and to provide for the proper use thereof, and to protect project lands against deterioration due to improper use of water. Delinquencies in any payments due to the United States shall be penalized by a penalty of not less than one-half of 1 per centum per month. No water shall be delivered to or for any land or party while either said land or the organization in which it is located or said party is in arrears in the advance payment of operation and maintenance charges or development period charges under subsection (c) (1), or in arrears for more than twelve months in the payment of an installment of the reimbursable construction costs. "(5) The Secretary shall establish the size of farm units of irriga- ble lands on each project in accordance with his findings of the area sufficient in size for the support of a family on the lands to be irri- gated. No water may be delivered to or for more than the farm unit area of irrigable lands in the project owned by a single landowner: Provided, That this subsection shall not apply to the United States or any agency or instrumentality thereof, corporate or otherwise. No water shall be delivered to or for any land, in a project area, trans- ferred or disposed of subsequent to approval of the project by the President, and within three years from the time water becomes avail- able, unless and until it has been shown to the satisfaction of the Secretary or his duly authorized representative that the land has been transferred or disposed of at a price not exceeding the appraised value as determined by the Secretary or his duly authorized repre- sentatives, and upon proof of fraudulent representation as to the true consideration involved the Secretary is authorized to cancel the water right attaching to the land involved: Provided further, That nothing herein shall be construed to create authority to interfere with the delivery of water under prior rights. "SEc. 5. (a) In connection with the construction or operation and maintenance of projects undertaken pursuant to the authority of this Act, and in order to further in the Great Plains and arid and 1122 [54 STAT.