Distribution mains

Distribution mains are the pipes transporting water from reservoirs into almost every street in Canberra and other cities. The pipes are large enough to make sure all households can get enough water at peak times. They are also designed to provide enough water for the fire brigade when they need it to put out fires. Usually these pipes range from 600mm to 1000mm (6 to 10 centimetres) in diameter.

Mains pipes are usually made from cast iron with a cement lining or cement-lined steel. In some cases much lighter plastic pipe may be used.

Isolation valves are placed along all mains pipes so that sections can be isolated and turned off when repairs are needed. Valves are placed at regular intervals so that only a small number of households are affected when repairs are needed.

Fire hydrants are placed at regular intervals on distribution mains so that the fire brigade does not have to travel far to get water for fighting fires.

It is important for the fire brigade to be able to find hydrants easily and quickly. In Canberra, many hydrants are marked with blue reflectors in the middle of the road, or curbside ‘FH’ markers.