The long distance water transfer tunnel which links the state of Pahang and Selangor in Malaysia is under construction. The tunnel length is 44.6 km with diameter of 5.2m and it constitutes as one of the largest infrastructure projects in Asia. The maximum overburden is 1,246m at the state border between Selangor State and Pahang State. The completed project will aim to relieve the shortage of water supply for daily life and industries of Kuala Lumpur and Selangor State in the future by Supplying Approximately 1.89 million m3/ day of water from the Semantan River in Pahang state to a water treatment plant at Langat in Selangor state.

The 44.6km long tunnel includes 3 sections comprising 34.6km excavated by Tunnel Boring Machine (TBM), 4 sections with length of 9.1km excavated by conventional tunneling and a short cut-and-cover section. The challenges in long-distance tunneling (with individual TBM drives up to 11.6km length) while achieving high rates of progress had been discussed.

Several measures have been taken and it had been achieved breakthrough all of the tunnel on 19th of February 2014 without measure accident. There had been numbers of geological problems which is passing fault zones, heavy water ingress, rock bursting and high rock temperatures and one of mechanical problem which is main bearing failure but the performance of the TBM and the countermeasures applied have been proven effective.

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