Va. Code Ann. § 10.1-621

If a proposed watershed improvement district is situated in more than one soil and water conservation district, copies of the petition shall be presented to the directors of all the soil and water conservation districts in which the proposed watershed improvement district is situated, and the directors of all affected soil and water conservation districts shall act jointly as a board of directors with respect to all matters concerning the watershed improvement district, including its organization. The watershed improvement district shall be organized in the same manner and shall have the same powers and duties as a watershed improvement district situated entirely in one soil and water conservation district.