The water supply systems of most buildings make integrated
use of 3 types of systems, namely the direct supply system,
indirect supply system and sump and pump supply system.
Under the direct supply system, fresh water is transmitted
directly from the public water mains to households at
lower floors by means of hydraulic pressure inside the
mains.
Under the indirect supply system, a water pump is used
to draw water from the storage tank installed at the ground
level of the building, and fresh water drawn into the
rooftop water tank is then transmitted to each household
through a network of sub-mains.
Under the sump and pump supply system, water is transmitted
to the receiving end by fitting a pressure pump to the
supply: a fire main is one that functions in this way.
A water supply system comprises water pumps, risers,
storage tanks, automatic float switches and sub-mains;
All integral parts of the water supply system should
be regularly checked and properly maintained.
All water storage tanks should be cleansed at regular
times for quality control.
Enquiries about water supply systems can be directed
to the Water Supplies Department on its telephone hotline
at 2824 5000.
