Keeping floodwaters out of New Orleans motivated the region s most influential landscape manipulation : the erection of artificial levees on the crown of natural levees to prevent overbank flooding.
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The natural levees of the Mississippi River ( on the east ) and the levees along its previous course ( now Bayou Teche ) on the west define the Atchafalaya Basin.
23.
Zone A was a sub-mound soil complex of dark clay with lots of silt, where the original land surface was uneven and a natural levee on the north bank of the Coosawattee.
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Some of the most extensive seasonally flooded areas in South Asia are situated in bowl-shaped depressions known as haors located between the natural levees of rivers subject to overflow during the monsoon.
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The highest ground runs along the river, where centuries of flooding built up a natural levee, and includes the strand of prosperous neighborhoods from Audubon Park to the Garden District to Downtown.
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As the river crosses Kanagawa, it forms natural levees in the soft soils of the alluvial plains of central Kanagawa, and forms almost no river delta as it exits into the ocean.
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Near the coast, where river courses widen and river banks and natural levees are low, floodwaters spill over onto the floodplains until large sections of the lowlands become continuous sheets of water.
28.
The natural levees created by deposits from the Mississippi were made of rich sandy and silty loams which allowed the common Southeastern deciduous hardwoods, such as hickory, elm, gums and oaks to flourish.
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Immediately before large-scale human development, most of the Delta islands had saucer-like cross sections, with low natural levees flanking a marshy interior " bowl " that flooded intermittently with the seasons and tides.
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Consisting of natural levees, barrier islands, forests, swamps, and fresh, brackish and saline marshes, the region is home to complex ecosystems and habitats that are necessary for sustaining its unique and vibrant nature.
