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Floodplains store materials moving downstream and, in doing so, provide habitat for a wide variety organisms. Water, dissolved materials, sediment, and organic matter move downstream, but individual water or solute molecules or sediment grains can be stored on floodplains for periods that range from a few minutes to 10,000 years for sediment on the floodplain of the Amazon River. Storage reflects the strongly three-dimensional movements of materials in a river corridor. Episodic exchanges of water, solutes, sediment, and organic matter between the channel, floodplain, and subsurface create a dynamic environment with diverse habitat. A recent article in Reviews of Geophysics examines the influencing factors and nature of floodplain storage. Here, the author answers our questions about floodplain storage.