This is Part 6 in the series “How to Build a Rainwater Collection System”.  Click to see parts one, two, three, four and five.

Are you concerned with the aesthetics of above ground water storage?  Then underground storage may be right for you.

Underground storage tanks need to be structurally engineered to withstand the inward pressures of back filling and compacting. Most will need to be weighted down so ground water will not “float” the tank when empty.  It is advised that a curtain drain be installed at bottom of excavation to allow excess ground water to drain away for the same reason.

Buried tanks can be fiberglass, plastic, and cement. Large sizes (over 2,000 gallons) tend to be fiberglass, while smaller plastic tanks (up to 2,000 gallons) can be manifolded together to achieve the desired capacity. Cement tanks should be lined with a poly liner and “mono poured” when constructed.

Other specialty tanks consist of modular which are may be buried and bladder or pillow tanks that can be placed in crawl spaces.

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