Indirect water supply system

• In this system , the water from the main is supplied first to a cold-water storage cistern then only draws out to the other fittings . 
• All the sanitary fittings , except drinking water draw-offs at kitchen sinks are supplied indirectly from this cold-water storage cistern . 
• The drinking water sink in kitchen or pantry is always connected to rising main to ensure safe drinking water supply because the rising main is connected to the main water authority supply , furhtermore cistern stored water could also be contaiminated . '
• For design purpose , the capacity of the storage cistern can be estimated from the guidelines given by the authorities for various types of buildings .