; and (B) not later than 2 years after the date of enactment of this Act, shall issue revised water control manuals for Apalachicola-Chattahoochee-Flint projects that ensure the maintenance of freshwater flows, considering the findings of the study under subsection (c)(1), as appropriate. (2) Operational modifications In carrying out paragraph (1), the Secretary shall ensure that operational modifications needed to maintain freshwater flows are achieved, to the maximum extent practicable, while providing system-wide balance in conservation storage through the maintenance of water levels in the same action zone for each of the Apalachicola-Chattahoochee-Flint project reservoirs. (3) Independent peer review of water control manuals (A) In general The Secretary shall enter into an arrangement with the National Academy of Sciences under which the Academy shall carry out an independent peer review of each revised water control manual, as required under section 2034 of the Water Resources Development Act of 2007 ( 33 U.S.C. 2343 ). (B) Compliance Each independent peer review carried out under this paragraph shall comply with section 2034 of the Water Resources Development Act of 2007 ( 33 U.S.C. 2343 ). (4) Final approval Before a final water control manual may be issued, the Secretary shall obtain written approval of each water control manual developed under this subsection from— (A) the Administrator of the Environmental Protection Agency; (B) the Director of the United States Fish and Wildlife Service; (C) the Administrator of the National Oceanic and Atmospheric Administration