If, after the review and approval of the watershed work plan under § 25–404 of this subtitle, the board of directors determines that it is in the interest of the watershed association to modify the purpose, scope, or location of the watershed project covered in the watershed work plan in a manner that would change the benefits or damages to landowners, the board of directors shall develop a supplemental watershed work plan. The supplemental watershed work plan shall: be developed as provided in § 25–401 of this subtitle; and include the modified watershed project. The board of directors and the county commissioners, county council, or Mayor and City Council of Baltimore City shall follow the procedures set forth in §§ 25–402 through 25–404 of this subtitle in implementing the supplemental watershed work plan. A watershed viewers’ report required under § 25–505 of this title based on a supplemental work plan developed and submitted under this subtitle that is approved by the county commissioners, county council, or Mayor and City Council of Baltimore City shall supersede any prior watershed viewers’ report.