; and (ii) provide sufficient information for the formulation of the water reallocation studies, including processes and procedures related to reviews and assistance under paragraph (7). (4) Agreement Before carrying out a water reallocation study under paragraph (1), the Secretary and the non-Federal interest shall enter into an agreement. (5) Review by Secretary (A) In general The Secretary shall review each water reallocation study received under paragraph (2) for the purpose of determining whether or not the study, and the process under which the study was developed, comply with Federal laws and regulations applicable to water reallocation studies. (B) Timing The Secretary may not submit to Congress an assessment of a water reallocation study under paragraph (1) until such time as the Secretary— (i) determines that the study complies with all of the requirements that would apply to a water reallocation study carried out by the Secretary; and (ii) completes all of the Federal analyses, reviews, and compliance processes under the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq. ), that would be required with respect to the proposed action if the Secretary had carried out the water reallocation study. (6) Submission to Congress Not later than 180 days after the completion of review of a water reallocation study under paragraph (5), the Secretary shall submit to the Committee on Environment and Public Works of the Senate and the Committee on Transportation and Infrastructure of the House of Representatives an assessment that— (A) describes— (i) the results of that review; (ii) based on the results of the water allocation study, any structural or operations changes at the reservoir project that would occur if the water reallocation is carried out; and (iii) based on the results of the water reallocation study, any effects to the authorized purposes of the reservoir project that would occur if the water reallocation is carried out