(4)If the owner of the immovable property, over, under, along or across which a pipe or drain has been placed or carried under this section whilst such immovable property was not built upon, desires to erect any building on such property, the Chief Executive Officer, shall, by notice in writing, require the owner of the premises to close, remove or divert the pipe or drain in such manner as shall be approved by him and to fill in, reinstate and make good the immovable property as if the pipe or drain had not been placed or carried over, under, along or across the same:Provided that no such requisition shall be made unless in the opinion of the Chief Executive Officer it is necessary or expedient for the construction of proposed building or the safe enjoyment thereof that the pipe or drain should be closed, removed or diverted.
