The assessment is in line with the government’s efforts aimed at determining the potential of a municipality to suffer harm or loss; and also its capacity to anticipate, cope with, resist and recover from the impacts of hazards. It also aims to understand the types or different dimensions of vulnerability to wit; physical social, economic and environmental as well as the elements at risk (e.g. all objects, building facilities, population/people, animals, economic activities, public services, environment and cultural heritage and processes that may be adversely affected by hazardous phenomena (disaster) in a particular area either directly or indirectly and reducing if not totally mitigating the destructive effects and impacts of natural hazards on the populace. The activity is a follow-up to the Geohazard Assessment and Mapping (1:50,000 and 1:10,000 Scale) previously conducted by the Mines and Geosciences Bureau- Central Office. Comprising the team who conducted the Vulnerability and Risk Assessment (VRA) in the said areas are Mr. Socrates G. Gaerlan, Hazel C. Tuprio, Ms. Joan F. Moreno, Lester T. Valdez and Arnel S. Montemayor- Chief Geologist and Head of Party, Geologist, Administrative Assistant III, Cartographer II and Administrative Aide IV, respectively.
As regard to flood hazards, areas along the banks of the major river systems and its tributaries are certainly prone to riverine flooding as these areas are natural conduits for floodwaters whenever the rivers/creeks overflow its channel during excessive rainfall and strong typhoons. The sources of floodwaters in the municipality of Mangaldan are Angalacan River and Old Mangaldan River. While in the municipality of San Fernando, an unnamed creek along Barangay Biday and Tanqui caused the flooding within the city.
In terms of landslide hazards the municipality of Mangaldan have no reported major incidence of landslides due to its relatively flat to gently sloping terrain. However, the City of San Fernando poses a threat to mass movements due to its highly fractured, intensely weathered and thinly bedded rock formations.
Figure 2 Debris slide was observed along the road of Barangay Santiago Sur, City of San Fernando due to highly fractured rocks.