An easement and rights at the cost, risk and expense of the Crown or the local government, by itself or by its officers, servants, agents, contractors and workers to enter the lands subject to the easement with machinery, materials, vehicles and equipment and to construct, alter, maintain, inspect and repair underground water mains or pipelines, storm sewers, sanitary sewers or any like local government works, including all related works appurtenant to them, restoring without delay as far as is practicable the surface of the lands to the same condition as it was prior to the commencement of the work or excavation, together with the right, by action or otherwise, at any time to enjoin the owner of the lands subject to the easement, including the heirs, executors, administrators, successors and assigns of the owner, from erecting or locating on the lands subject to the easement any building, structure or other obstacle which could impair the free and full use of the easement or permitting the erection or location on them of any such building, structure or other obstacle.