Safeguards Against Flooding

Where a facility is in an area that is subject to FLOODING, measures must be taken to prevent tanks from floating during a rise in water level up to the established maximum flood stage. To accomplish this:

A vertical tank must be located so that its top extends above the maximum flood stage by at least 30% of it capacity.
If a horizontal tank is located in a position that allows more than 70% of the tank's storage capacity to be submerged at the established flood stage, the tank must be securely anchored. Tank vents or other openings that are not liquid-tight must extend above the maximum flood stage.
A dependable water supply shall be available for filling an empty or partially filled tank if necessary.

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