Construction of new Tunnel No. 4 (4.00 meters diameter x 6.40 kilometers length) from Ipo to Bigte.
Aims to improve the reliability and security of the raw water through partial rehabilitation of the transmission system from Ipo to La Mesa and the introduction of water safety, risk and asset management plans.
The Project involves the construction of a new 4.00 meters tunnel (Tunnel no. 4) by 6.30 kilometers including intake and outlet works.
The Project will secure raw water supply to the 13 million inhabitants of Metropolitan Waterworks and Sewerage System (MWSS) service area, through the rehabilitation of the Angat transmission line.
It is estimated that currently each day about 800,000 cubic meter (m3) or 20% of the total potential capacity of raw water is lost due to leakage of the aqueducts.
The main components of the Angat transmission line are as old as 50 years, in poor condition, and not in compliance with structural and seismic requirements, risking the partial interruption of Metro Manila’s water supply. The proposed financing modality is a Project loan.
Provision of water supply and sanitation in Metro Manila (Manila) is the responsibility of MWSS, a government-owned corporation. In 1997, it awarded two concession contracts to private firms for water distribution. MWSS retained responsibility for bulk water supply.
The privatization of the distribution services brought about significant improvements in the delivery of water supply services. The serviced population has doubled since 1997, of which more than 90% have 24 hours access.
The non revenue water level (NRW) of over 60% in 2002 currently ranges from 10 to 40%. MWSS’s capacity to fulfill its responsibility of ensuring and securing the availability of raw water to the concessionaires needs to be strengthened by:
(i) Rehabilitation of the raw water transmission system; and
(ii) adopting a comprehensive water safety, risk- and asset management system.