Pulangi Dam Explained

Pulangi Dam
Name Official:Pulangi IV Hydroelectric Power Station
Location Map:Mindanao#Philippines
Location Map Caption:Location in Mindanao##Location in the Philippines
Coordinates:7.7864°N 125.0236°W
Country:Philippines
Location:Maramag, Bukidnon
Status:O
Construction Began:1982
Opening:1986
Owner:National Power Corporation
Dam Type:Gravity/embankment
Dam Crosses:Pulangi River
Spillway Type:Tainter gate-controlled
Res Name:Pulangi IV Reservoir (upper and lower)
Res Capacity Active:670000000NaN0
Res Catchment:180000NaN0
Res Surface:19.850NaN0
Plant Name:Pulangi IV Hydroelectric Power Plant
Plant Coordinates:7.7158°N 125.0238°W
Plant Commission:1985/86[1]
Plant Turbines:3 x 85 MW Francis-type
Plant 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 255MW 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 diverts water into a power channel which parallels the river until it reaches the lower reservoir (surge pool) at, 7.50NaN0 to the south. At the lower reservoir, water is fed to each of the three 85abbr=onNaNabbr=on 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 15000000NaN0 of sediment annually. Of the reservoir's combined 670000000NaN0 active capacity, 230000000NaN0 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]

The artificial lake created by the reservoir proper is called the Pulangi Lake or the Maramag.

Notes and References

  1. Web site: Power Plant Profiles. National Power Corporation. November 4, 2011. dead. https://web.archive.org/web/20111028155008/http://www.napocor.gov.ph/generations/MYWEB/Body/Power%20Plants%20Profiles.htm#Choose%20how%20would%20you%20like%20to%20view%20the%20power%20plants:. October 28, 2011.
  2. Book: Land use change in tropical watersheds : evidence, causes and remedies. CABI Pub.. 2005. 0-85199-912-3. Coxhead. Ian. [Online-Ausg.]. Wallingford [u.a.]. 11. Shively. Gerald. Gerald Shively.
  3. Web site: Pulangi 4 Hydroelectric Power Plant Philippines. Global Energy Observatory. November 4, 2011.
  4. Web site: Pulangi IV Hydropower Plant Reservoir Rehabilitation. 18th Conference of Electric Power Supply Industry. National Power Corporation. November 4, 2011. https://web.archive.org/web/20120425135529/http://www.aesieap0910.org/upload/File/20101025%E4%B8%8A%E5%82%B3/TS2302%20VMD%20Presentation-CEPSI%202010_Final.pdf. April 25, 2012. dead.
  5. Web site: Delgado Jr.. Victor M.. The Effectiveness of Desilting the Pulangi IV Hydropower Plant's Reservoir. National Power Corporation. November 4, 2011. August 2010. https://web.archive.org/web/20120425135634/http://www.aesieap0910.org/upload/File/PDF/4-Technical%20Sessions/TS23/TS2302/TS2302_FP.pdf. April 25, 2012. dead.
  6. Book: Bonell. M.. Bruijnzeel. L. A.. Forests, Water and People in the Humid Tropics: Past, Present and Future Hydrological Research for Integrated Land and Water Management. 2005. Cambridge University Press. 9781139443845. 138. December 15, 2016. en.