(a) The board by order may designate an area as a separately defined area and annex the area to the district if, on hearing a petition under Section 7803.252, the board finds that:
(1) there is a need for improvements for the conservation and reclamation of the defined area;
(2) the area will benefit from the improvements; and
(3) the improvements will serve a public use and benefit.
(b) The board does not have to include all of the area described in the petition if the board finds that a modification of the area is necessary or desirable.
(c) The order must be entered in the board's minutes and filed for record in the same manner required for other district annexations of land.