ANGAT HYDROELECTRIC DAM

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Angat Dam is a concrete water reservoir embankment hydroelectric dam that supplies the Manila metropolitan area water. It was a part of the Angat-Ipo-La Mesa water system. The reservoir supplies about 90 percent of raw water requirements for Metro Manila through the facilities of the Metropolitan Waterworks and Sewerage System and it irrigates about 28,000 hectares of farmland in the provinces of Bulacan and Pampanga. – Read More: wikipedia.org

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Photo from: https://news.mb.com.ph/2016/11/13/phase-ii-of-angat-dam-rehab-begins/

The Angat-Ipo-La Mesa Dam Raw Water System is currently the major source of water for Metro Manila. The water extracted from this location is treated in two facilities: The Balara Treatment Plant (Manila Water Company, Inc.) and La Mesa Treatment Plant (Maynilad Water Services Inc.).

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The Angat Reservoir and Dam are located at the Angat River in San Lorenzo, Norzagaray, Bulacan. The facilities were constructed from 1964 to 1967 and have been operational since 1968. They have multiple functions:

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To provide irrigation to about 31,000 hectares of land in 20 municipalities and towns in Pampanga and Bulacan;
To supply the domestic and industrial water requirements of residents in Metro Manila;
To generate hydroelectric power to feed the Luzon Grid; and
To reduce flooding to downstream towns and villages.

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The principal river, Angat River, originates from the western flank of the Sierra Madre Mountains. It then cuts through the mountainous terrain in a westerly direction to the dam site. The elevation within the watershed rises to a maximum of 1,115 meters at the Sierra Madre Mountain range and is lowest at the dam site at 100 meters. It has three major tributaries, namely, the Talaguio, Catmon and Matulid Rivers. The Angat Watershed has a moderate to intensive forest cover and has a drainage area of about 568 square kilometers, which receives an average annual rainfall of about 4,200 millimeters.

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The Angat Dam is a rockfill dam with a spillway equipped with three gates at a spilling level of 219 meters. Its storage capacity is about 850 million cubic meters. Water supply to the MWSS is released through five auxiliary turbines where it is diverted to the two tunnels going to the Ipo Dam.

Source: manilawater.com