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Pahang Selangor Raw Water Transfer Tunnel

A water transfer tunnel 44.6km in length and 5.2m in diameter was constructed to solve the water problems in the capital of Malaysia. A high-performance machine advanced at a record monthly rate, as the Tunnel Boring Machines (TBM) method and New Austrian Tunneling Method (NATM) were employed.

Pahang Selangor Raw Water Transfer Tunnel Image1

Pahang Selangor Raw Water Transfer Tunnel Image2

Pahang Selangor Raw Water Transfer Tunnel Image3

The tunnel transfers municipal and industrial water to Kuala Lumpur, the capital of Malaysia, and the state of Selangor from the adjacent state of Pahang at a daily rate of 1.89 million m3.
Tunnel sections of 34.6, 9.1 and 0.9km were constructed using the TBM method, NATM and cut and cover method, respectively. The geology was composed mainly of granite, so a high-performance computer-controlled drill jumbo was adopted as a hydraulic drill for NATM, and advanced at a record monthly rate of 283m. For the TBM method, a machine with a driving force 30 percent higher than that of ordinary devices was employed and advanced at a monthly rate of 657m, further contributing to shortening the construction period.

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