Let's take a look at a natural free-flowing river, its tributaries, and its floodplain. When heavy rains fall or snow melts in a river basin, such as this, the river first rises to the top of its banks. The water then flows into the lowest lying areas of the floodplain, into wetlands, side channels, and marshes. If the water continues to rise, so too does the water within the river's floodplain. During the largest floods, floodwaters rise until they reach the outer extent of the floodplain. It is the cyclical flow of water into floodplains that makes these areas among the most beneficial and valuable places on earth for people and nature. Floodplains serve as natural filters that clean our water by removing nutrients and sediments. Floodplains can support highly productive farms because centuries of floods have left behind nutrient-rich soil. Floodplains also recharge underground aquifers used for drinking water and irrigation, and these areas are among the richest places for wildlife, like fish and waterfowl, that support important economic activities. But what happens when a river and its floodplain are altered? Dams are often constructed to help by holding back floodwaters and releasing them later. Levees, which are common fixtures along most large rivers, are also built to control floodwaters by keeping water in the river channel. With these structures in place, floodplains can be farmed with a reduced risk of flooding. With a sense of security created by dams and levees, communities often grow within floodplains. Over time, some towns within floodplains grow into cities. Now let's take a look at what happens when a river is changed by dams and levees. Flood, as is true with the natural system, the river will first flow into the lowest lying areas of the floodplain. Here, though, few such areas remain as designed....
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Flood zone surveyor Form: What You Should Know
Elevation Form for Federal Flood Insurance Certificate The Elevation Form is not necessary when submitting your application through FEMA. FEMA is the only authorized agency through which you should be submitting this. Â This is a very important step. If you don't fill this out you can still file a flood insurance application by submitting a completed copy of the form to the National Flood Insurance Program (FF WIP).
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