.-(1) All enclosures surrounding above ground tanks in an installation shall be provided with proper drainage facilities in such a way that no water is allowed to accumulate in the enclosure.(2)No part of the enclosure referred to in sub-rule (1) shall be below the level of the surrounding ground within the protected area.(3)Where drainage is effected by means of a pipe, the pipe shall be fitted with a valve which is capable of being operated from the outside of the enclosure or with any other arrangements approved in writing by the Chief Controller.(4)All valves and other opening for draining off water shall be kept closed except when water is being drained off.(5)The nature of the drainage arrangements and the position of all openings and valves therein shall be shown in the plan submitted with the application for a license.
