Pulangi IV Hydroelectric Power Plant
The upper (pondage) reservoir located at 7°47′11″N 125°1′25″E / 7.78639°N 125.02361°E 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, 7.5 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. The Pulangi IV power plant provides 23% of the hydroelectric power generated on Mindanao.
Since operation, the reservoirs associated with the power plant have received an estimated 1,500,000 m (1,216 acre⋅ft) of sediment annually. Of the reservoir's combined 67,000,000 m (54,318 acre⋅ft) active capacity, 23,000,000 m (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. The unexpected siltation threatens safe operation of the dams and power generation, in addition to drastically shortening the predicted operational lifespan of the dam. 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.
The artificial lake created by the reservoir proper is called the Pulangi Lake or the Maramag.
References
- ^ "Power Plant Profiles". National Power Corporation. Archived from the original on October 28, 2011. Retrieved November 4, 2011.
- ^ Coxhead, Ian; Shively, Gerald, eds. (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.
- ^ "Pulangi 4 Hydroelectric Power Plant Philippines". Global Energy Observatory. Retrieved November 4, 2011.
- ^ "Pulangi IV Hydropower Plant Reservoir Rehabilitation" (PDF). 18th Conference of Electric Power Supply Industry. National Power Corporation. Archived from the original (PDF) on April 25, 2012. Retrieved November 4, 2011.
- ^ Delgado Jr., Victor M. (August 2010). "The Effectiveness of Desilting the Pulangi IV Hydropower Plant's Reservoir" (PDF). National Power Corporation. Archived from the original (PDF) on April 25, 2012. Retrieved November 4, 2011.
- ^ 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 December 15, 2016.