With severe flooding there is a threat of transporting larger particles such as rocks and sediments.
Severe floods can also create massive erosion, that can undermine bridge structures and buildings causing them to collapse..
Water that enters human build structures creates water damage. Flooding of farmlands results in loss of crops.Flood waters can concentrate toxic pollutants, debris and garbage and it can cause harm on the environment. Drinking water may become polluted. Wildlife habitats can be destroyed.
There are a number of measures that can minimize impact of future floods some of them are quite effective. Those are: channel modifications, dams, levees, dikes and floodwalls, floodways.