Owner: DOHWA Engineering Co., Ltd.
Address: 438 Samseong-ro, Gangnam-gu,
Seoul, Republic of Korea (06178)
The Angat Water Supply Transmission Improvement Project (AWTIP) will assist the Metropolitan Waterworks and Sewerage System (MWSS) in securing and strengthening its water supply system that serves 15 million inhabitants of Metro Manila, province of Rizal and portion of the Province of Cavite through the construction of a new raw water transmission tunnel (number 4) under a design-build contract.
Angat reservoir is the main source of drinking water supply for the Metropolitan Waterworks and Sewerage System (MWSS) service areas, which provides about 97% water supply. Releases from Angat, flow along the river to the Ipo reservoir from where raw water us conveyed through a transmission system of tunnels to Bigte and aqueducts to water treatment plants in La Mesa and Balara. The treated water is then distributed to households, businesses, and industries in Manila, and parts of Cavite and Rizal.
It is estimated that currently up to 200,000m3 (200 MLD) or 5% of the total potential capacity of raw water from Angat reservoir is lost daily due to leakage of the aqueducts. The transmission system is relatively old, in poor condition, and not in compliance with current structural and seismic requirements, risking the partial interruption of MWSS’s water supply.
The Project which will be procured under a Design and Build Contract is new tunnel is approximately 6.3 kilometers (km.) long and with a finished, internal span diameter of approximately 4 meters. The works consist of (i) intake structure at Ipo reservoir; (ii) tunnel works; (iii) new transition basin at Bigte; (iv) connection of the new transition basin at Bigte to the existing transition basin No. 3 at Bigte; and (v) necessary modifications to the existing transition basin No. 3 at Bigte.
