5. Whenever an island, of which possession shall have been taken by Government under section 3 of this Act, shall become attached to the mainland, any person having an estate or interest in any part of the riparian mainland to which such island may become attached while it is in the possession of Government may apply to the Collector to take measures for the construction of ways, paths and roads on the island: the costs thereof to be equally divided between the applicant and the ¹[Government].