Reservoir Sedimentation Studies

Abstract

The Balog-Balog Reservoir was conceptualized in 1986 as a single, high dam that would supply irrigation water supply to the Balog-Balog River irrigation system of Tarlac. However, the proposal remained on the drawing board until an unsolicited proposal to construct a multiple dam system composed of nine reservoirs with small dams was submitted to the government in 2012. This chapter presents the Balog-Balog Reservoir study with single, high dam versus this multiple dam system. In the context of reservoir sedimentation, it is expected that the single, high dam would have a longer life compared to the low dams. The San Roque Reservoir study is also presented in this chapter to assess the reservoir life with reservoir sedimentation. This study was a requisite of a loan package agreement that after its completion in 2002, every 5 years a reservoir operations and sediment management study would be conducted. Finally, the sediment flushing operations study in Pulangi Reservoir is discussed in this chapter. Pulangi Reservoir is the only major reservoir in the Philippines with a sediment flushing facility but was never activated since its completion in 1985 until after the study on sediment flushing was conducted in 2005. For both San Roque and Pulangi Reservoir sedimentation management studies, a two-dimensional hydraulic model of flow and sediment transport was employed to conduct the study.