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Drainage Services Department - Sustainability Report 2012-2013

Executive Summary

The Year's Highlights

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[highlight1.gif] 25 No. of Awards Received in 2012-13

The year of 2012-13 signifies success of our Department. Our professionalism, efforts and passion for excellence has repeatedly enabled us to receive local and international prizes and recognition.

Awards At a Glance

  • 2011 Hong Kong Awards for Environmental Excellence Certificate of Merit (Public Organisations and Utilities Sector)
  • Skyrise Greenery Award 2012 - Silver Award and Merit Award (Government Projects Category) and Merit Award (Planning / Research Projects Category)
  • Considerate Contractors Site Award Scheme 2011
  • 2012 International Water Association Project Innovation Awards (East Asia Regional Awards) in Planning Category
  • 2012 International Water Association Project Innovation Awards (Applied Research Category)
  • 2011 Vision Awards Silver Award (Government Category) and Top 25 Chinese Annual Reports of 2011
  • Ombudsman's Award 2012 for Officers of Public Organisations
  • The 23rd Annual International Galaxy Awards - Silver Award (Annual Reports - Government)
  • Hong Kong Institute of Landscape Architects Design Awards 2012 Merit Award (Environmental Design/Greening Category) and Merit Award (Landscape Planning/Research Category)
  • Certification of OHSAS 18001 Occupational Health and Safety Management System
  • Hong Kong Flower Show 2013 Gold Award for Design Excellence (Landscape Display Category)

Flood Prevention

Completion for River Improvement Works in Upper Lam Tsuen River, She Shan River and Upper Tai Po River


The engineered She Shan River


The commissioning ceremony of River Improvement Works in Upper Lam Tsuen River, She Shan River and Upper Tai Po River was held in January 2013 which declared the rivers had attained a flood protection standard of 1 in 50 years

Commissioning of Hong Kong West Drainage Tunnel, Lai Chi Kok Drainage Tunnel and Tsuen Wan Drainage Tunnel

To further enhance Hong Kong's overall flood protection capability, we have commissioned three large-scale drainage tunnels including Hong Kong West Drainage Tunnel (HKWDT), Lai Chi Kok Drainage Tunnel (LCKDT) and Tsuen Wan Drainage Tunnel (TWDT) in August 2012, October 2012 and March 2013 respectively. By adopting the interception approach at uphill catchment, the drainage tunnels provide effective and long-term flood protection to the urban downstream areas.


The commissioning ceremony of the LCKDT on 18 October 2012 declared the accomplishment of an engineering milestone to relieve the flooding problem in northwest Kowloon

Removal of Two More Flooding Blackspots

With the progressive completion of our flood prevention projects, we have removed all the remaining major or regional flooding blackspots in Hong Kong in 2010.

In 2012-13, we have further eliminated two flooding blackspots at Ha Wo Che Village in Sha Tin and Ling Tsui Tau Tsuen in Mui Wo, reducing the number of blackspots from 15 to 13 in 2013.

Change in Total Number of Flooding Blackspots


Sewage Collection, Treatment and Disposal

Latest development of Harbour Area Treatment Scheme Stage 2A

The Harbour Area Treatment Scheme (HATS), consisting of two stages, aims to improve the water quality of Victoria Harbour by intercepting and treating sewage generated from both sides of the Harbour. HATS Stage 1 was commissioned in December 2001 and the major engineering works of Stage 2A, now in progress, is targeted for completion in end 2014.

HATS Stage 2A comprises three parts, namely, upgrading works for the Stonecutters Island Sewage Treatment Works (SCISTW), upgrading works for eight preliminary treatment works and construction of the sewage conveyance system. During the year, the works under the awarded contracts are progressing smoothly.

Part 1: Upgrading Works for Stonecutters Island Sewage Treatment Works

The major upgrading works at SCISTW, including the provision of covers and deodorisation facilities to the existing sedimentation tanks and the construction of interconnection tunnel and diaphragm wall for the new main pumping station were completed in June and July 2012 respectively. Other major upgrading works, including the construction of a new main pumping station and sludge dewatering facilities are now in full swing.


The two deodorisation units and covers for the sedimentation tanks were completed in June 2012, and testing and commissioning was completed successfully in September 2012

Part 2: Upgrading Works for Eight Preliminary Treatment Works

This includes the upgrading of the eight preliminary treatment works (PTW) around the northern and southwestern shore of Hong Kong Island at North Point, Wan Chai East, Central, Sandy Bay, Cyberport, Wah Fu, Aberdeen and Ap Lei Chau. All works under the awarded contracts are progressing satisfactorily.

Part 3: Construction of the Sewage Conveyance System

Under HATS Stage 2A, the remaining sewage generated from Hong Kong Island's northern and southwestern regions will be collected and conveyed to SCISTW via a total of 21 kilometres of deep tunnels with depths varying from 70 metres to 160 metres below sea level.

During the year, there has been ongoing deep tunnel excavation adopting drill-and-blast method at North Point, Wan Chai East, Sandy Bay, Cyberport, Aberdeen, Sai Ying Pun and Stonecutters Island sites. Excavation of the vertical shaft also continues at the Wah Fu site.


Excavation of tunnels by drill-and-blast method is on-going


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