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Flood Hazard Web Mapping System Created with TatukGIS SDK

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Author:Caleb Turner
Caleb Turner
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Higashihiroshima City in Hiroshima Prefecture, Japan, has launched a flood hazard and disaster prevention web GIS application designed to inform residents about potential flood risks associated with agricultural irrigation reservoirs. Developed using the TatukGIS Developer Kernel (DK) for ASP.NET, the system provides interactive mapping tools that allow citizens to evaluate possible inundation scenarios if a nearby reservoir were to fail due to earthquakes, extreme rainfall, or typhoon-related events.

The city contains more than 1,800 priority agricultural reservoirs and roughly 2,200 smaller irrigation ponds, making it one of the most reservoir-dense municipalities in the prefecture. Reservoir failures in 2018 highlighted the need for improved public awareness and preparedness, as dozens of reservoir collapses across Hiroshima Prefecture resulted in significant flooding and loss of life. The new GIS application aims to reduce risk by giving residents access to clear, location-specific hazard information before disasters occur.

The platform enables users to visualize simulated flood scenarios under worst-case assumptions, including a full reservoir and instantaneous collapse. Citizens can view projected flood extents, expected inundation depths shown through color gradients, estimated arrival time of floodwaters at specific locations, and recommended evacuation routes to higher ground or designated emergency shelters. This information helps residents understand their level of risk and determine how much time they may have to evacuate safely.

For planning and reporting purposes, users can download high-resolution PDF maps for selected areas, allowing households, local authorities, and emergency planners to print and retain hazard information for use during emergencies. The application also integrates multiple geospatial data sources, including OpenStreetMap base layers, elevation contours, aerial imagery delivered through WMTS services, and locally stored vector datasets. Built-in reprojection capabilities ensure that all layers are displayed seamlessly in a unified coordinate system.

Developed by Tsukasa Consulting Co., the system runs on Microsoft IIS using ASP.NET Web Forms and leverages TatukGIS SDK functionality for map rendering, data management, and PDF export. By combining accurate spatial data, simulation modeling, and user-friendly visualization tools, the flood hazard web GIS strengthens disaster preparedness and provides residents with actionable information that supports faster, safer evacuation decisions.

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