existing cross harbour fresh water mains of about
Quality Impact: the assessment area should include the area within
Impact Assessment: the assessment area should include the area within
Quality Impact Assessment: the assessment area should include the areas within
and Visual Impact: the area for
landscape impact assessment should include all areas within
2.3 Project Requirements, Scope and Benefits
existing cross harbour fresh water mains, comprising twin
Project provides opportunity to lay new cross harbour water mains to replace
the existing ones, to avoid damage to the existing mains and disruption to
essential water supply to
the existing cross harbour water mains not be reprovisioned under the Project,
the existing cross harbour water mains will potentially be damaged by the
reclamation works and the construction of the Trunk Road tunnel. Without the cross harbour watermains,
the fresh water supply to
2.4.1 The alternative to constructing new cross harbour watermains to reprovision the existing one is to construct a deck over structure above the existing pipelines. However, this alternative option is considered not feasible as the Trunk Road tunnel will be crossing the existing pipelines at a similar level and there will be problems for future maintenance of the pipelines below the deck structure. Construction of new cross-harbour water mains is considered a reasonable and practicable solution.
the proposed twin
2.5.2 Similar to the pipe material and jointing adopted for the existing submarine watermains, the pipe material for the proposed one shall by high yield steel pipes and the pipes will be longitudinally butt welded.
2.5.3 To protect the submarine watermains against damage by maintenance dredging and marine operation in the harbour, cover and cushion layers similar to those for the existing submarine watermains will be provided. The cushion layer can be in materials such as armour, steel plate, etc.
2.5.4 The construction method for the submarine pipelines involves dredging for a pipe trench and laying of bedding materials, pipelines and covering materials by marine plants. The construction of the land section of the fresh watermains will follow the normal practice with excavation and installation of shoring, bedding, pipelaying, backfilling, construction of chambers, installation of valves, pressure testing and pipe sterilization.
2.6.1 Operational activities, on completion of the Project, would comprise essentially the operation of the new cross harbour watermains, which replaced the existing one running from Tsim Sha Tsui to the waterfront at the west of HKCEC.
2.7.1 The construction works of the Cross-harbour water mains are anticipated to commence on site in early 2009, with completion by 2010. A construction programme is presented in Appendix 2.5 for reference.
(i) Civil Engineering and Development Department's CRIII project, comprising reclamation along the Central waterfront for transport infrastructure needs (including CWB and NIL) and basic land use requirements. A section of CWB tunnel will also be constructed under CRIII project. Construction will take place from February 2003 to September 2012.
(ii) Trade Development Council’s Atrium Link Extension project, comprising a link bridge spanning across the water channel between the Hong Kong Convention and Exhibition Centre (HKCEC) Phase I and HKCEC Extension. Construction will take place from May 2006 to March 2009.