Section 17 Damage may be ascertained when works done.

Where any damage has been sustained by reason of any works authorized by this Act in or upon lands required to be kept free from buildings and other obstructions in respect of which works compensation has not been agreed upon, awarded, or otherwise ascertained prospectively, compensation shall be paid in respect thereof when the works have been done; such compensation to be determined in like manner as other compensation under this Act, or as near thereto as circumstances admit.