Science / Geology / Levee: A long continuous ridge built by people along the banks of a stream to contain the water during times of high flow. Natural levees can also be built along the banks of a stream. When the flood water decelerates upon leaving the channel, sediments quickly drop out of suspension and build a ridge over time.
Science / Geology / Natural Levee: A mound of sediment that parallels a stream channel forming a levee-like deposit. When flood waters leave the normal stream channel and enter the flood plain there is a reduction of velocity that caus MORE