33 U.S.C. § 2340

(a) Federal allocation Upon authorization by law of an increase in the maximum amount of Federal funds that may be allocated for a water resources project or an increase in the total cost of a water resources project authorized to be carried out by the Secretary, the Secretary shall enter into a revised partnership agreement for the project to take into account the change in Federal participation in the project. (b) Cost sharing An increase in the maximum amount of Federal funds that may be allocated for a water resources project, or an increase in the total cost of a water resources project, authorized to be carried out by the Secretary shall not affect any cost-sharing requirement applicable to the project. (c) Cost estimates The estimated Federal and non-Federal costs of water resources projects authorized to be carried out by the Secretary before, on, or after November 8, 2007 , are for informational purposes only and shall not be interpreted as affecting the cost-sharing responsibilities established by law.