Dynamic flood warning system: An integrated approach to disaster mitigation in Bangladesh
Mostly the Northern part of the Study area is always in the flood affected region. Flood inundation maps were prepared using simulation results. As the simulation results at every hour for the next 72 hours are available, so flood inundation maps can be prepared at any of those time stamps using the forecasting water levels. Water levels in the Flood Phase Maps (F0-F4) were classified into five classes- dark blue showing higher water depth (Figure 3)
 Figure.3: Flood phase maps of Sunderganj Thana There is considerable crop damage almost every year of moderate flood. Overlaying land use map over the flood map, the area of affected crops was found out (Figure 4).
The area was then reclassified according to the types of crops. The table 1 shows the possible percentage of affected crops in the next 72 hours. Information of predicted populations and infrastructures affected were also established using overlay operation. Those maps indicated the accessible route to evacuate people during emergency.
It is important for the Warning System, to develop/ find out the efficient route to provide direction to the vulnerable people to move out during emergency. Before doing this, we need to come up with a plan that will enable us to choose the best possible way to minimize travel time to reach to the destination in an effective manner. Arc view Network Analyst helps us to use networks more efficiently. It helps to find out the quickest way to get the safest location (Figure 5), to determine the best route to reach. Overlaying this information with population data, it is easy to understand the situation, from where most of the people getting service and where to provide more additional set up of facilities.  Figure.5: Closest route to the hospital and optimum route to the cyclone shelter |
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