Our Core Responsibilities
“Summer always brings rain. To carry away rainwater, we must keep our drains clear…” Both sewage treatment and rainwater drainage are closely tied to the daily lives of citizens. While endeavouring to provide world-class sewage and rainw ater drainage services, we boost our resilience to increasing extreme weather. It is our goal to create a more livable environment for the public.
Shek Wu Hui Sewage Treatment Works Improvement Project
Overview of Flood Prevention in 2016-17 
- Inspected over 2,200 kilometres of drains and rivers
- Removed the flooding blackspot at the junction of Wong Chuk Hang Road and Nam Long Shan Road
- Currently reviewing the DMPs for antau and Outlying Islands, Shatin and Sai Kung, Tai Po and Northern Hong Kong Island
Overview of Sewage Treatment and Sewerage System 2016-17 
- 1,015
Annual sewage treatment volume (million m3) - 93.5%
Coverage of public sewerage (Population percentage)
Based on the no. of domestic water bill accounts with sewage charges levied - 1,755
Total length of sewerage network (km) - 304
Total no. of sewage treatment facilities
Managing Underground Drainage and Sewerage Networks
DSD currently manages more than 4,100 kilometres of underground drains and sewers. These underground pipes have been put in service for 29 years on average and over 1,800 kilometres of these pipes have been used for 30 years or more, many of them show signs of wear and tear. We schedule regular inspection plans to monitor the conditions of these underground pipes and conduct rehabilitation works as and when necessary. In 2016-17, we rehabilitated about 22 kilometres of drains and sewers at a cost of about $138 million.
Structural failure of seriously deteriorated pipes may result in road subsidence. Apart from the impact on the operation of the pipelines, it may bring about adverse impacts on traffic, environment and public safety. In view of this, we are striving to implement a territory-wide rehabilitation programme for aged stormwater drains and sewers using risk-based approach. Condition survey and rehabilitation of high risk underground pipes are being implemented in phases. At the same time, we will study and apply various cutting-edge R&R techniques to efficiently maintain our underground pipe networks and achieve greater cost-effectiveness of our works.
