33 U.S.C. § 2291

(a) The Secretary may enter into a contract providing for the payment or recovery of an appropriate share of the costs of a project under his responsibility with a Federal Project Repayment District or other political subdivision of a State prior to the construction, operation, improvement, or financing of such project. The Federal Project Repayment District shall include lands and improvements which receive identifiable benefits from the construction or operation of such project. Such districts shall be established in accordance with State law, shall have specific boundaries which may be changed from time to time based upon further evaluations of benefits, and shall have the power to recover benefits through any cost-recovery approach that is consistent with State law and satisfies the applicable cost-recovery requirement under subsection (b). (b) Prior to execution of an agreement pursuant to subsection (a) of this section, the Secretary shall require and approve a study from the State or political subdivision demonstrating that the revenues to be derived from a contract under this section, or an agreement with a Federal Project Repayment District, will be sufficient to equal or exceed the cost recovery requirements over the term of repayment required by Federal law.