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The Mines and Geosciences Bureau Regional Office No. V (MGB R.O.-V), in line with the implementation of the 3rd phase National Geohazard Mapping and Assessment Program has completed a monthlong Vulnerability and Risk Assessment (VRA) and updating of the existing 1:10,000 scale flood and landslide susceptibility maps of the Municipality of Tiwi, Albay.

A survey team from the Geosciences Division of MGB R.O.-V conducted the VRA last February 7-28, 2019 covering sixteen (16) barangays of the said Municipality, namely: Barangays Mayong, Dap-Dap, Misibis, Maynonong, Joroan, Bariis, Lourdes, Sugod, Naga, Cararayan, Libjo, Tigbi, Putsan, Bolo, Baybay and Gajo. The assessment focused on the physical and social vulnerability to flood and landslide hazard conditions of these barangays.

The field assessment consisted of mapping and inventory of all elements at risk, such as residential houses, commercial and institutional buildings. Further, data on socio-economic indicators were also obtained from the households. Historical information on geohazard events and their effects were also gathered from residents, particularly on floods and landslides.

Most of the barangays covered by the VRA in Tiwi, Albay generally lie in mountainous areas that are highly prone to landslides while the low-lying areas that lie on the distal foot slopes of Mt. Malinao towards the shorelines of Lagonoy Gulf are susceptible to floods. It was also noted that several institutional buildings and residential houses are situated in critical areas have been recommended for relocation.

The outputs of the field survey will include 1;10,000 scale Vulnerability Maps, Risks Maps and update of 1:10,000 scale Flood and Landslide Hazard Maps will serve as inputs in the preparation of the LGU in formulating disaster risk reduction management plans.