The flood damage for the year 2030 in the areas below were calculated including the percentage increase in the inundated areas and flood depth. Increasing flood depth contributed to the majority of the flood damage in different cities except for San Mateo, Rizal. The major contributor to flood damage varies in one area to another [1][2][3]. Pasig: 525% total damage; 116% flood depth; 38% inundated areas Taytay: 1468% total damage; 223% flood depth; 37% inundated areas San Mateo: 252% total damage; 41% flood depth; 105% inundated areas With the data and projections available, to minimize and avoid flood risk and related economic loss, appropriate strategies should be planned and implemented such as the creation of structural and non-structural measures.

Knowledge and experience in spatial analysis is required to use this approach. In spatial analysis, three components worked together to create a flood risk assessment. (1) Inputting a high flow discharge to observe how the water is distributed in the area and simulating flooding considering water depth and inundation area. (2) Determining which areas are affected by the flood simulation. (3) Application of flood depth-damage function to determine direct flood damage as well as interviews with the locals on how the area is affected due to previous flooding events [2].

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There is no direct environmental impact for this solution.