Question

compare active flood plains and old flood plains​

Answer 1

An area adjacent to a lake, stream or other body of water that is periodically flooded, ranging from rare, severe storm events to flows experienced several times a year. For example, a "10 year floodplain" would include the area of inundation that has a frequency of occurring, on average, once every 10 years. It includes lands at the same elevation as areas with evidence of moving water, such as active or inactive flood channels, recent fluvial soils, sediment on the ground surface or in tree bark, rafted debris, and tree scarring.