As used in this article “contract with the United States” means a contract made under the provisions of the Federal Reclamation Law for any or all of the following purposes:

1. (a) Acquisition, extension, or operation of works for irrigation, drainage, flood control, or development of electric or other power.
2. (b) A water supply.
3. (c) Assumption as principal or guarantor of indebtedness to the United States.