Underground Concrete Water Tank
Underground water tanks are quite popular here. I had the pleasure of watching one being constructed at my friend Martin’s house remodel project. His is quite large, about 6 * 4 meters with a depth of 4 meters. Here is a shot of a corner section during construction. You can see that concrete is used to fill in the cavities in the heavy cement blocks. This along with metal rebar strands adds much to the overall strength of the tank walls.
Martin told me he had been down this road a time or two before, and normally the inner surface of a concrete underground tank would crack, which would let in surrounding soil and spoil the water. That is why he went with the heavy cement blocks, as shown here. Each one weighs about 13 kg, as compared to about 5 kg for the small size block. Also, he had the workmen use a heavy stucco coat of about 2 cm. on the surface to seal it and add additional strength.
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