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Re: Water tank in basement

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Nigel,
I would also be concerned about water vapor rising from the water storage
reservoir into the structure above.  Could create lots of mold and humidity in
the structure, leading to possible air quality problems with the tenants.
Would need a very good ventilation system for the reservoir.
John Rose

Nigel Blair wrote:

> 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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