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Public Advisory: Status Of Major Dams in Luzon (Oct. 8, 2009)

The PAGASA-DOST being the lead Agency in the Flood Forecasting and Warning System for Dam Operation (FFWSDO) informs all the concerned government agencies, local government units the status of the monitored reservoirs in Luzon as of 4:00 PM today:

The Pantabangan Dam increased its outflow from 250cms to 500cms starting at 2PM today and is forecast to increase as additional inflow is expected in the watershed. The RWL of Pantabangan is 220.28 m AMSL and an inflow of 1705 cms with 2 gates open and total opening of 4 meters. All municipalities/cities in the target area of Pantabangan dam particularly in Rizal, Bongabon, Gen. Natividad, Palayan City, Cabanatuan City, and Sta. Rosa are advised to seek higher grounds.

The Magat dam decreased its outflow from 2245 cms to 1578 cms. The RWL increased from 192.31m AMSL to 192.22 m AMSL with 4 gates open and total gate opening of 7 meters. The target area of Magat dam includes the municipalities of Ramon, San Mateo, Aurora, Cabatuan, Luna, Reina Mercedes, Burgos, Naguilian and Gamu in the province of Isabela.

Both the Ambuklao and Binga dams in Benguet increased their outflow of 1525cms to 2341 cms to San Roque dam in Pangasinan resulting in the increase of the RWL of San Roque Dam from 287.50 m AMSL to 288.65 m AMSL (about 1.35 m below the normal high water level of 290.0 m AMSL). The increase in the outflow of Binga dam necessitated the further increase in the outflow of San Roque dam to 3156 cms with 6 gates open and total opening of 15 meters at 4PM today. The municipalities that are likely to be affected in Pangasinan are: San Manuel, San Nicolas, Tayug, Sta. Maria, Asingan, Villasis, Alcala, Bautista, Rosales and Bayambang and are advised to evacuate to higher grounds immediately due to expected widespread flooding.

All residents along the Agno river, Magat river and middle Cagayan river and upper Pampanga river are advised to evacuate and stay tuned to warnings/advisories from PAGASA. The PAGASA will continue to provide update on the monitored reservoirs until such time that all spillway operations are terminated.

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