Dissemination of Tidal Flood Risk Map Using Online Map in Semarang

Semarang is one of the largest cities in Java Island that is very prone to tidal flood. In order to reduce the tidal flood risk, disaster managers and city planners need a well-planned natural disaster risk management method based on disaster risk map of the city area. Risk mapping alone is not enough; an efficient system to disseminate the result of risk mapping for general public is also needed. This work intends to solve a problem of arrangement and presentation of tidal flood risk mapping. In order to develop the disaster risk map, the validation and prediction of the tidal flood were done to produce a hazard map on the tidal flood. Subsequently, the maps of vulnerability and capacity of the study area were produced based upon VCA (Vulnerability Capacity Analysis) by using fuzzy logic and weighted method approaches. As a comparison to that, the calculation of tidal flood risk was also done by adopted to the Indonesian regulation of The Natural Disaster Risk Management Head PERKA BNPB No. 2 year 2012. Finally, the risk map online was designed and developed. This system has the function of information dissemination and spatial data download of the risk map result. The online map uses KML format for sharing spatial data attributes and uses Google Maps as the map engine. The online map also gets good responses through a usability test, where it can be concluded the online map is effective, efficient, and satisfactory to users.