Tunnel No. 5’s future construction was recently confirmed in a contract signing on 23 December 2021, between the representatives of the Common Purpose Facilities and China International Water and Electric Corporation, the permanent works contractor for the design and build contract.

Tunnel No. 5 is a P3.2 Billion capital expenditure project funded jointly by Manila Water and Maynilad through the Common Purpose Facilities. It will be constructed in parallel distance with AWTIP-Tunnel 4, traversing the Ipo Dam to Bigte Basin alignment in Norzagaray Bulacan.

Tunnel 4 which has been operational since July 2020, has integrated and increased the conveyance capacity of the Ipo-Bigte transmission system.   Tunnel No. 5, on the other hand, which is a major part of the re-engineering works of the Umiray-Angat-Ipo-La Mesa raw water conveyance system, will be constructed to ensure that raw water to the Concessionaires is not impacted by the decommissioning or rehabilitation of the very old Tunnels 1 to 2 (whichever is feasible) and future rehabilitation of the aqueducts.   Metro Manila will thus benefit from an improved and more reliable water supply, as well as increased infrastructure resilience, once Tunnel No. 5 becomes  operational.

Major work on this phase two of the AWTIP tunnels is scheduled to begin in early June 2022. Tunnel No. 5 is scheduled to be completed in May 2024 and will transport around 1,700 MLD of raw water, saving approximately 240 MLD from transmission leaks at the La Mesa portal.

Signing of the Supervision Consultancy Services for the project was likewise inked in 17 December 2021 with DOHWA Engineering Company Limited.

MWSS Administrator Leonor Cleofas expressed her gratitude and optimism and asked the Concessionaires and the Contractors to replicate the success of AWTIP Tunnel 4, which was completed two (2) months ahead of schedule.