25. Whenever it may have been determined in the final order to be passed on any such enquiry that anything done by the Engineer under the last preceding section was unnecessary, any person who shall have sustained damage by the execution of such works shall receive compensation from the Government or the Authority to be assessed according to the provisions contained in Part IV of this Act; and, on receipt of any application to that effect by the Engineer from any person so affected, the land or the embankments or drainage shall, so far as any alteration thereof shall appear to have been unnecessary, be, at the expense of the Government or the Authority, restored as nearly as possible to the state in which they were when the Engineer commenced to act under the provisions of this Part.