it to adapt to, withstand, and rapidly recover from the corresponding flood event. (4) Alternatives In evaluating alternatives, including alternative sites and designs, the head of the agency shall fully consider the ability of natural systems and nature-based processes to achieve or support flood risk reduction and cost savings over the long term. (d) Guidelines for agencies (1) Guidelines Agencies shall amend their regulations and procedures to incorporate the resilience standards established under subsections (b) and (c) to establish new flood risk management standards. Agency standards shall, at a minimum, incorporate provisions to implement subsection (a) and shall require that the construction of Federal structures and facilities and construction of structures and facilities using Federal funds be in accordance with the standards and criteria established under subsections (b) and (c) and comply with applicable State, local, tribal, and territorial standards that exceed Federal standards and criteria. Such standards shall be consistent with the purposes of the National Flood Insurance Program. (2) Issuance Not later than the expiration of the 18-month period beginning on the date of the enactment of this Act, the Federal Interagency Floodplain Management Task Force shall issue guidelines to be used by agencies in meeting the requirements of this Act. (3) Required content At a minimum, such guidelines shall— (A) establish appropriate tracking and reporting procedures for agencies to follow