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Periodic floods are important because of the role they play in maintaining natural geomorphic and ecological processes in rivers. However, fully understanding their role is hampered by the difficulty of undertaking controlled experimental studies in river channels during flood events. To solve this problem, we recently developed a small portable flume (Figure l).The flume increases hydraulic forces acting over a patch of river‐bed, thus mimicking conditions associated with floods. We have used it to conduct experiments to help resolve questions related to the interactions between instream hydraulics, sediment transport, and invertebrate drift during small, frequent floods [e.g., Gibbins et al.,2007].

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