(1) If a building is, or to be, so situated that water of any kind will drain towards it, adequate drainage shall be provided to divert such water away from the building in such a manner that no erosion of the soil supporting the building and no dampness arising from such water which might adversely affect the stability of the building will occur.

(2) No building shall be erected in or adjacent to any natural watercourse unless the floor level of such building is raised above the maximum known flood level of the watercourse, and precautions are taken, to satisfaction of the local authority, to ensure no obstruction occurs to the flow of slood waters in the watercourse.