; (4) in subsection (d)— (A) in paragraph (2), by striking shall be conducted and inserting the following: “shall be— (A) designed to protect and restore ecological integrity (as defined in section 219.19 of title 36, Code of Federal Regulations (as in effect on the date of enactment of this subparagraph)); (B) based on the best available scientific information; and (C) conducted ; and (B) by adding at the end the following: (4) Reducing redundancy An existing watershed plan, such as a watershed protection and restoration action plan developed under section 304(a)(3), or other applicable watershed planning documents may be used as the basis for a water source management plan under this subsection. ; (5) in subsection (e)(1), by striking purpose of— in the matter preceding subparagraph (A) and all that follows through the period at the end of subparagraph (C) and inserting purpose of advancing any of the purposes described in subsection (b)(2). ; and (6) in subsection (g)— (A) in paragraph (2)— (i) by striking at least equal to and inserting not less than 20 percent of ; (ii) by striking The Secretary and inserting the following: (A) In general Subject to subparagraph (B), the Secretary ; and (iii) by adding at the end the following: (B) Waiver The Secretary may waive the requirement under subparagraph (A) in the discretion of the Secretary. ; and (B) in paragraph (4)— (i) in subparagraph (B), by striking $10,000,000 for each of fiscal years 2019 through 2023 and inserting $30,000,000 for each of fiscal years 2024 through 2033