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Brian Reed gravatar image

The first issue is not the build in a flood prone area! This may sound obvious but people may have no choice due to poor transport to work or bad planning. Look at these non-technical factors and see if you can find why people are settling in inappropriate places.

For flooding, it depends on the speed and level of inundation. Is it long term slow inundation in the rainy season or danger of rapid overland flow in storms? Raising the ground level for the building may be enough to avoid shallow flooding. If the building is going to repeatedly flooded, a good foundation and lower wall is a good start, even if the rest of the structure is not so robust. This can prevent damage for minor flooding and can help the home be restored quickly after a larger event. If there is flash flooding, bunds (shallow banks) can divert surface flows away from the most vulnerable areas.

But do see if people can be relocated!