![]() ![]() Contractors and suppliers for PSWTĪustralian consulting engineering company SMEC provided its expertise in construction supervision and consultancy services on the project. Seven sections along the tunnel route were selected to study the squeezing and water inflow hazards and their degree of occurrence using various previously reported techniques. Ring beams, rock bolts and fibre mortar shotcrete were used for primary ground support under high cover. The geotechnical characteristics of the rock masses were evaluated based on laboratory and field investigations to assess the geological hazards along the tunnel route. Tunnelling was carried out using three TBMs from Robbins, namely Kamila, Selpah and Tiara Midori. The tunnel will convey 1.89 million litres of raw water daily from Sungai Semantan in Pahang to the Hulu Langat WTP in Selangor. Water, sewerage, storm water, electrical, telephone, fiber optic and other utility mains and distribution systems may require excavation, rerouting. The upper and lower ends were excavated by New Austria Tunnelling Method (NATM). It has the capacity to discharge 27.6m³ of raw water per second.Ĭonstruction works involved excavation using tunnel boring machines (TBM) for 35km, while the remaining length was excavated by conventional drilling-and-blasting or by cut-and-cover. The 44.6km-long, 5.23m-diameter tunnel starts at Karak, Pahang, running deep under the ground up to 1,200m below the Titiwangsa mountain range and hot springs. Outlet structures in Selangor will transfer the water to the new treatment plant. Water to the tunnel will be supplied through an 858m-long inlet conduit structure and pumping station located in the Pahang River Basin. The WTP, to be built with an estimated investment of RM3.74bn (approximately $1.16bn), will have a capacity of 1,200 million litres per day. The later part of the project will involve the construction of Langat 2 water treatment plant (WTP) in Hulu Langat and a distribution system downstream. Construction of a pumping station, dual water pipelines, access roads and a telemetry system are also part of the project. The components of the RM2.48bn (approximately $766.87m) PSWT project include a transfer tunnel, 35m-high Kelau Dam with an effective capacity of 299 million cubic meters and the Semantan intake facility. The Angola WTP supplies water from Xangongo to Ondjiva, located in the province of Cunene in southern Angola. The project was financed through a loan provided by Japan International Cooperation Agency. Japanese companies Shimizu Corporation and Nishimatsu formed a joint-venture (JV) with local companies IJM and UEM Builders to excavate the tunnel. The water tunnel is being built as part of the Pahang Selangor Raw Water Transfer (PSWT) project aimed at supplying raw water from the River Semantan to the states of Pahang, Selangor, Kuala Lumpur and Negeri Sembilan. A 26-ft diameter 425-ft deep shaft at the raw water pump station 3,872-ft of 7-ft diameter raw water conveyance tunnel lined with welded steel pipe from the pump station to WTP-4. ![]() Construction activity started in 2010 and the excavation works were completed by May 2014. 4,386-ft of 9-ft diameter tunnel lined with unreinforced cast-in-place concrete to convey raw water by gravity from the lake intake to the pump station. The project involves construction of three tunnels measuring 44.6km-long, making it the world’s 11th longest tunnel and the longest in South-East Asia. Pahang Selangor Raw Water Transfer Tunnel is a huge gravity-driven raw water transfer tunnel being constructed by the Malaysian Ministry of Energy, Green Technology and Water (KeTTHA). The ground breaking ceremony held in August 2010 in Karak, Pahang. Image courtesy of The Robbins Company.Īssembling of Robbins TBM in its US manufacturing facility. “We support the Newsom administration’s decision, and look forward to participating in a project that will both meet water reliability needs and minimize impacts to the communities and ecology of the Delta.The last phase of the tunnel excavation works was completed in May 2014. To ensure a diverse water supply – one that will be resilient through climate change and potential earthquakes across California – we also need a modern conveyance solution through the Delta. “While we are aggressively pursuing projects to expand local supplies, like groundwater recharge and recycling, it isn’t an ‘either-or’ option. ![]() “It is reassuring that Governor Newsom recognizes that the status quo is not an option and that the outdated and vulnerable conveyance system through the Delta must be updated. In response, SCV Water General Manager Matt Stone issued the following statement: Gavin Newsom, the California Natural Resources Agency announced Friday that the California Department of Water Resources will withdraw plans for a twin-tunnel water conveyance project and instead advance a single-tunnel solution for the Sacramento-San Joaquin Bay Delta. ![]()
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