Pulangi Dam

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Pulangi Dam
Pulangi Dam is located in Philippines
Pulangi Dam
Location of Pulangi Dam in Philippines
Official name Pulangi IV Hydroelectric Power Station
Country Philippines
Location Maramag, Bukidnon
Coordinates 7°47′11″N 125°1′25″E / 7.78639°N 125.02361°E / 7.78639; 125.02361Coordinates: 7°47′11″N 125°1′25″E / 7.78639°N 125.02361°E / 7.78639; 125.02361
Status Operational
Construction began 1982
Opening date 1986
Owner(s) National Power Corporation
Dam and spillways
Type of dam Gravity/embankment
Impounds Pulangi River
Spillway type Tainter gate-controlled
Creates Pulangi IV Reservoir (upper and lower)
Active capacity 67,000,000 m3 (54,318 acre·ft)
Catchment area 18,000 km2 (6,950 sq mi)
Surface area 19.85 km2 (8 sq mi)
Power station
Name Pulangi IV Hydroelectric Power Plant
Coordinates 7°42′56.70″N 125°01′25.66″E / 7.7157500°N 125.0237944°E / 7.7157500; 125.0237944
Commission date 1985/86[1]
Turbines 3 x 85 MW Francis-type
Installed capacity 255 MW

The Pulangi IV Hydroelectric Power Plant, also known as the Pulangi Dam, is located on the Pulangi River near Maramag in Bukidnon province on the island of Mindanao in the Philippines. It uses two reservoirs, produced by damming the Pulangi River, to supply water to a run-of-the-river hydroelectric power plant; the power plant is capable of generating 255 megawatts (342,000 hp) of power.[2] Construction began in 1982; the first two generators became operational in December 1985, with the last generator being commissioned in 1986.[3]

The upper (pondage) reservoir located at 7°47′11″N 125°1′25″E / 7.78639°N 125.02361°E / 7.78639; 125.02361 (Pulangi IV Upper Reservoir) diverts water into a power channel which parallels the river until it reaches the lower reservoir (surge pool) at 7°42′56″N 125°1′25″E / 7.71556°N 125.02361°E / 7.71556; 125.02361 (Pulangi IV Hydroelectric Power Plant), 7.5 km (5 mi) to the south. At the lower reservoir, water is fed to each of the three 85 MW (114,000 hp) Francis turbine-generators via a penstock.[4][5] The Pulangi IV power plant provides 23% of the hydroelectric power generated on Mindanao.[4]

Since operation, the reservoirs associated with the power plant have received an estimated 1,500,000 m3 (1,216 acre·ft) of sediment annually. Of the reservoir's combined 67,000,000 m3 (54,318 acre·ft) active capacity, 23,000,000 m3 (18,646 acre·ft) has been filled with silt. The siltation rate was almost 1 meter annually and caused the dam's reservoir to work at 50% capacity.[6] The unexpected siltation threatens safe operation of the dams and power generation, in addition to drastically shortening the predicted operational lifespan of the dam.[2] At first, the minimum and maximum water levels were raised and, in 2007, dredging work was performed around the head work of the upper reservoir's head. Selective dredging in the upper reservoir began in 2010, and continues as of 2011.[4][5]


  1. ^ "Power Plant Profiles". National Power Corporation. Retrieved 4 November 2011. 
  2. ^ a b Coxhead, ed. by Ian; Shively, Gerald (2005). Land use change in tropical watersheds : evidence, causes and remedies ([Online-Ausg.] ed.). Wallingford [u.a.]: CABI Pub. p. 11. ISBN 0-85199-912-3. 
  3. ^ "Pulangi 4 Hydroelectric Power Plant Philippines". Global Energy Observatory. Retrieved 4 November 2011. 
  4. ^ a b c "Pulangi IV Hydropower Plant Reservoir Rehabilitation" (PDF). 18th Conference of Electric Power Supply Industry. National Power Corporation. Retrieved 4 November 2011. 
  5. ^ a b Delgado Jr., Victor M. (August 2010). "The Effectiveness of Desilting the Pulangi IV Hydropower Plant's Reservoir" (PDF). National Power Corporation. Retrieved 4 November 2011. 
  6. ^ Bonell, M.; Bruijnzeel, L. A. (2005). Forests, Water and People in the Humid Tropics: Past, Present and Future Hydrological Research for Integrated Land and Water Management. Cambridge University Press. p. 138. ISBN 9781139443845. Retrieved 15 December 2016.