The water demand in Selangor, Wilayah Persekutuan Kuala Lumpur and Wilayah Persekutuan Putrajaya is expected to exceed that available from sources within Selangor in the near future. The challenge initiated the Government to implement the Pahang-Selangor Interstate Raw Water Transfer Scheme (Interstate RWTS) which is scheduled for completion in 2013.

To complement this initiative, the Government through Pengurusan Aset Air Berhad (PAAB) has embarked on the proposed Langat 2 water treatment plant (WTP) and associated distribution works to treat and distribute the water that will be received from the interstate raw water transfer scheme. A consortium of consultants led by SMHB Sdn Bhd in association with Ranhill Consulting Sdn Bhd and KTA Tenaga Sdn Bhd was appointed by P AAB commenced work on 15th February 2008.

The project will be developed in two phases with each phase capable of treating and distributing 1,130 Mld of water to target consumers. The construction of the Phase 1 works is scheduled for completion in early 2013 with the intention of being ready to receive the raw water from interstate raw water transfer scheme.

Due to difficulty in pipeline laying and high land acquisition cost around the well-developed Kuala Lumpur and Petaling Jaya, 3 tunnels have been incorporated in the pipeline distribution design. The tunnels are:

Ampang Tunnel

  • Twin 3.8m dia., 2.2km long lined tunnel
  • Replacing the required pipeline and act as a service reservoir
    • Advantages:
      • Part of conveyance system to replace the pipeline
      • Provide underground storage instead of building a reservoir
      • Environmentally friendly
      • Lower construction cost
      • Minimum land acquisition

Sludge Disposal Utilities Tunnel

  • 4m dia., 1.2km long unlined tunnel
    • Housing utilities pipes and services
  • Advantages:
    • Least sludge pumping cost
    • All services (power, telemetry cables and water supply) and residual pipes are installed in the same dedicated tunnel
    • Minimum land acquisition

Sg. Besi Tunnel

  • 4m dia., 525m long unlined tunnel
  • Housing 2 numbers of 2.5m dia. pipeline to facilitate gravity flow
  • Advantages:
  • Do not need pumping scheme to cross over the high ground
  • Minimum land acquisition
  • Shorter pipeline route for whole distribution system

Besides the major concept and detailed design, the scope of works also includes Mentoring programme for developing small Bumiputra Consulting Firms. All Consortium members have included one firm each to undertake specific scope of works under this initiative.

Other services include the following:

  • Hazard & Operability Study (Hazop)/Hazard Review (Hezrev) Assessment
  • Risk Management
  • Training of PMB and Operators staff
  • Project Documentation and Publication of Technical Book



Concept design, detailed design, project management consultancy, environmental impact assessment/ environmental monitoring programme and construction supervision.

Note: Project on hold between 2010-2013 pending restructuring of Selangor water industry.


Associate Firm

Ranhill Consulting Sdn Bhd and KTA Tenaga Sdn Bhd


Pengurusan Aset Air Berhad


Selangor and Wilayah Persekutuan Kuala Lumpur, Malaysia

Commencement Year


Completion Year


Construction Cost

RM1.8 billion