Replies to Questions from Finance Committee Members

Examination of Estimates of Expenditure 2003-04
CONTROLLING OFFICER’S REPLY TO
WRITTEN/SUPPLEMENTARY QUESTION
Head : 194 Water Supplies Department Subhead (No. & title) :
Programme : 1 Water Supply: Planning and Distribution
Controlling Officer : Director of Water Supplies
Director of Bureau : Secretary for the Environment, Transport and Works
Question :
In 2001-03, the new leakage rate of water mains is 25-26%. Why does it remain at such a
high level? Are there any measures to reduce the leakage?
Asked by : Hon. LAU Wai-hing, Emily
Reply :
Reply Serial No.
ETWB(W)038
Question Serial No.
0764
Aging of water mains is the principal factor contributing to water leakage in the water
distribution system. To combat the water leakage problem, we have implemented the
following measures-
(1) Continuous Monitoring
Continuous monitoring of the water distribution system using district meters, and
electronic data logging and transmission equipment is carried out to pick up early
signs of suspected leakage in the district under monitoring.
(2) Proactive Leakage Control
Regular and systematic leak detection tests over the water distribution system are
carried out so that repair to leaky water mains can start and be completed in the
shortest possible time.
(3) Pressure Management
Flow-modulated pressure reducing valves are installed at strategic locations to
regulate water pressure in the water distribution system to reduce water leakage while
maintaining an adequate water pressure.