Chapter 3. General Flood Management Plan in the Laguna De Bay Coastal Region
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Data Collection Survey on Parañaque Spillway in Metro Manila Final Report in the Republic of the Philippines CHAPTER 3. GENERAL FLOOD MANAGEMENT PLAN IN THE LAGUNA DE BAY COASTAL REGION 3.1 Collection and Organization of Basic Information on Hydrology and Topography 3.1.1 Hydrologic Data (1) Rainfall Data Rainfall observation around Laguna de Bay is conducted by the following six institutions. Daily rainfall data is collected from PAGASA, PRBFFWC, NPC and MWSS. Regarding the hourly rainfall, EFCOS has been observing hourly rainfall and recording since 2003. Also, DOST ASTI has started the observation of hourly rainfall since 2015. 1. PAGASA (Philippine Atmospheric, Geophysical and Astronomical Services Administration) 2. EFCOS, MMDA (Effective Flood Control Operating System) 3. PRBFFWC (Pampanga River Basin Flood Forecasting and Waring Center, PAGASA) 4. NPC (National Power Corporation) 5. MWSS (Metropolitan Waterworks and Sewerage System) 6. DOST-ASTI (Advanced Science and Technology Institute) Table 3.1.1 shows the outline of rainfall observation data in the Laguna de Bay Basin. Table 3.2.1 shows the installation status of the rainfall observation data and Figure 3.2.1 shows the location map of rainfall observation stations. There are thirty-eight rainfall observation stations around the Laguna de Bay basin, and the observation stations where the rainfall observation data exists throughout the year varies from year to year. The station with the longest observation record of daily rainfall is Port Area where the observation has started since 1949. The hourly rainfall observation has been conducted by EFCOS since 2003; however, the observation is only in the Pasig–Marikina River Basin, and the hourly rainfall observation station is not yet established around Laguna de Bay. Also, the observation of the hourly rainfall and water level has been conducted by DOST ASTI since 2015, but the observation period is short which is not sufficient as the hourly data for the flood control plan. Table 3.1.1 Outline of Rainfall Observation Data Number of Daily Hourly No. Organization Department observation Remarks Rainfall Rainfall station For the large-scale flood 1 PAGASA DOST 24 ● ▲ events, the 6-hour rainfall data is available. 2 EFCOS MMDA 7 ● Observation started in 2003. 3 PRBFFWC DOST 3 ● 4 NPC - 2 ● 5 MWSS - 2 ● 6 ASTI DOST 15 ● Observation started in 2015 ●:Available, ▲:Partly Available CTI Engineering International Co., Ltd. 3-1 Nippon Koei Co., Ltd. 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