; and (iv) in subparagraph (A) (as so designated), by striking crop; or (2) surrender and inserting the following: “crop; or (B) surrender ; (4) by inserting after subsection (b) (as so designated) the following: (c) Delegation of authorities The Secretary shall delegate final decision-making authority to the State Conservationist, or the agency having that responsibility, of the State in which the work of improvement is located for the determination of when the watershed plan for a work of improvement shall be released for final public comment. (d) Deadline for approval or disapproval (1) In general Subject to paragraph (2), not later than 45 days after the date on which an application for a work of improvement is submitted to the Secretary, the Secretary shall approve or disapprove the application. (2) Extensions The Secretary may extend the deadline described in paragraph (1) by 45 days, if necessary. ; (5) in subsection (e) (as so redesignated)— (A) in the matter preceding paragraph (1)— (i) by inserting or the delegated authority under subsection (c) after The Secretary ; and (ii) by inserting or the delegated authority after if the Secretary ; and (B) in paragraph (2), by striking section 4 and inserting section 7 ; and (6) by adding at the end the following: (f) Approval of plans that improve the condition of a natural feature Notwithstanding subsection (a)(3), the Secretary may approve a plan for a multibenefit work of improvement, regardless of the ratio of costs to benefits of the multibenefit work of improvement. (g) Guarantee of funding for certain construction materials (1) In general Except as provided in paragraph (2), the Secretary may approve funding under a work of improvement for construction materials for pipes to convey water if the Secretary determines that the construction materials— (A) are fully recyclable; (B) maintain structural integrity for not less than 100 years