THE
ANGAT RIVER DEVELOPMENT
By
Angel P. Buenaventura
and
Antonio X.
Sison
China
Sea
LUZON
Pacific
50
Ocean
Singa
100
'MILES
HILIPPINE
Sulu
Sea
TINA
DANAO
ACCORDING to studies made by the National Power Corporation (NPC), power requirements in the metropolitan
of Manila growing at the rate of about 12 per cent annually.
area
are
To meet these demands three hydro-electric plants have been built in recent years at Caliraya (36,000 kW), Ambuklao (75,000 kW) and Binga (100,000 kW). In addition several steam plants owned
-To Irrigation
and
operated by the Manila Electric Com- pany, a Filipino private utility, have been put up.
these But despite
increases in generating facilities even greater ex- pansion was necessary and, as a consequence, NPC is now construct- ing its fourth major hydro-electric plant on the island of Luzon.
This project is the Angat River development. It is planned as an integral part of the interconnected system serving the island and prin-
Reservoir
Rockfill Dam
Intake
Tailrace Tunnel
MAIN
POWERHOUSE-
Tailrace tunnel
Switchyard-
Surge tunnel-
ANGAT
Powerhouse Surge Tunnel
Tunnel Diversion Tunnels
Spillway
-Power tunnel
- AUXILIARY
POWERHOUSE
Angat
River
POWERHOUSE DETAIL
Ipo Dam
RIVER
Diversion to Manila
for Water Supply
Figure 1. General plan of development.
Metera
Dike
1000
Plant has installed capacity of 212,000 kW
Far East Architect & Builder June, 1965
cipally the City of Manila and its environs.
Angat River originates in the Sierra Madre mountains. Its watershed area at the project site is 560 square kilometers. The range in monthly flows is from about 10 per cent. to about 480 per cent. of the average flow of 75 cubic meters per second.
Multi-purpose function
The river at present supplies the irrigation and water supply require- ments downstream. During the dry season, water shortage is usually ex- perienced. The river also contributes in no small way to floods during the rainy season which inundate rich agricultural lands in the central plains. of Luzon.
Because of this wide variation of monthly flows throughout the year, the construction of a dam across the river will permit regulation of flow, make available more water during the critical dry season and arrest early flooding during the rainy season. It will also permit the generation of power. Thus, the Angat River Scheme was designed as a multi-purpose project.
The irrigation, water supply and power development of the country are handled by separate agencies of
The the government.
government owned irrigation systems are the re- sponsibility of the Irrigation Ad- ministration while the water supply phase is handled by the National Waterworks and Sewerage Authority (NWSA). NPC takes care of power
Messrs. Angel P. Buenaventura and Antonio X. Sison are respectively pro- jects manager and civil engineer with the Engineering & Development Cor- poration of the Philippines.
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