Floods can distribute large amounts of water and suspended river sediment over vast areas. In many areas, this sediment helps replenish valuable topsoil components to agricultural lands and can keep the elevation of a land mass above sea level. An example of the latter case is the Mississippi delta. Before the Mississippi and associated rivers were controlled in levees in southern Louisiana, the rivers would frequently spill their banks. This processes made the lands of the Mississippi delta. This area is slowly subsiding with time and without the continued replenishment of sediment from river floods, much of it has dropped to elevations below natural sea level. Thus, one could say that not allowing floods is negative for this area. Our society has chosen instead to create a vast and complex system to keep Mississippi waters from reaching these lands. The lands remain dry but each year they subside more, making it ultimately more and more difficult to keep that way. On the negative side, floods disrupt normal drainage systems in cities and typically overwhelm sewer systems. Thus, raw or partially raw sewage spills are common in flooded area. Additionally, if the flood is severe enough, destruction of buildings that can contain a large array of toxic materials (paints, pesticides, gasoline, etc.) can cause the release of these materials into the local environment, which is not good.
Floods affect the ecosystem as they destroy an amount of area. This could be small or large. The larger it is, the more of the ecosystem it wipes out. It wipes it out as it could basically wipe out the producer in the food chain (plant) which would mean the rest of the food chain would fall down which would kill other food chains.
Jacksonville flood cleanup service
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