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Re: Water tank in basement

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Why not use a bladder made of a waterproof fabric constructed of such a size so that it does not contact the walls and is vented to the outside?

Bob Fennema

> From: Nigel Blair <nwblair(--nospam--at)>
> To: seaint(--nospam--at)
> Subject: Water tank in basement
> I have a client who is refurbishing his 4-storey apartment building.
> The superstructure loads are transmitted to the foundations via 8-inch
> thick loadbearing reinforced blockwalls.  The Client wants to convert an
> unoccupied underground compartment under the apartments into a rainwater
> storage tank (a town planning requirement), as there are financial and
> space constraints.  There is currently no floor slab in this
> compartment.  This compartment is 22ft long by 16ft wide and 6ft high.
> The compartment comprises four 8-inch thick reinforced concrete block
> loadbearing walls.  These walls are supported by 2ft and 3ft wide
> reinforced concrete strip footings on sandy/gravel soil.  The water
> table is within two feet of the footings.
> Could anyone on the list suggest possible methods of solving this
> problem?  I am concerned about making the compartment as watertight as
> possible (new slab and existing foundation joint) and making sure that
> the walls can resist the hydrostatic pressure imposed by the stored water.
> Thanks.
> Nigel.

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