43 U.S.C. § 526

All moneys or profits as determined by the Secretary heretofore or hereafter derived from the sale or rental of surplus water under the Warren Act of February 21, 1911 ( 36 Stat. 925 ) [ 43 U.S.C. 523 to 525], or from the connection of a new project with an existing project shall be credited to the project or division of the project to which the construction cost has been charged.