Assessment of loss due to flood hazard in Singkawang City (case study: Flood in 2016 at Singkawang City)

Singkawang City is in the Province of West Kalimantan, which is located above an alluvial plain, that causing the city to be prone of flood. The last flood that occurred happened in 2016, which resulted in many flooded buildings and hundreds evacuated resident. This research purposes are to identify the hazard level of flooding and then proceed with the assessment of economic losses. The flood hazard levels are obtained by overlaying the flood characteristics parameters, i.e. frequency, duration, and height of the flood. The method for assessing the rate of the damage is done by purposive random sampling method with consider to the flood hazard level and building value. The result showed that from 84,96 ha of flooded areas, flood hazard level is dominated by low and medium hazard, with percentage of area 44,02% and 43,03%, and high classification with percentage of 12,95%. The loss assessment for this research shows that the total loss from the flood is Rp15.838.232.500 (1.150 million USD). There is a difference in distribution amount of losses, which is strongly affected by the category of building value and the level of flood hazard from the existence of the building.