The Novaliches to Balara Aqueduct number four (NBAQ4) project is part of Manila Water’s improvement and expansion initiatives and is one of the largest and most important infrastructure projects undertaken by them to date. The project involves the construction of a new intake facility at the La Mesa reservoir, a 7.3-kilometre tunnelled aqueduct and an outlet facility at the Balara Water Treatment Plant.
NBAQ4 will deliver water to approximately seven million people in Manila. The PhP 5.3 billion (USD 104 million) design & build contract was awarded to a joint venture of CMC di Ravenna, First Balfour Inc. and Chun Wo Engineering in August 2017.
A 4m EPB TBM will be used for the tunnel construction including 80m radius bends. The TBM will be launched from a 40m deep construction access shaft with a 75m mined tunnel in weak volcanic rock for TBM operations. The TBM will dock in the Intake Structure built 150m offshore in the reservoir in a 16m diameter, 30m deep temporary cofferdam.
The presentation will detail the design and current construction progress.
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