311.15  Hearing — adjournment — order.
  Hearings on the proposed establishment of said district may be adjourned from time to time without loss of jurisdiction by the board. On final hearing the board shall proceed to a determination of said matters. It may reject, approve, or modify and approve said proposal. The board may exclude lands from the district or may add lands thereto or otherwise modify the proposal.
  Should the proposal be approved in whole or in part, the board shall establish such district. The order of the board establishing such district shall state the road or roads to be improved, the type of improvement, and the lands included in said district. Said order shall be final. No lands shall thereafter be added to or excluded from said district.
[C24, §4709; C27, 31, 35, §4753-a2; C39, §4753.02; C46, §311.12; C50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §311.15]