The tank may be used for the combined storage of domestic (e.g. flushing) and fire fighting waterprovided that the maximum potential draw off by domestic services can in no way diminish thesupply for fire fighting below the required reserve.

The minimum effective quantity of water required to be available, having regard to the floor area factor of the largest floor is as follows:

A non-ferrous non-return valve to be provided between the downcoming main and the fixed fire pump.

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