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HYDRAULICS OF CHANNEL EXPANSIONS LEADING TO LOW-HEAD CULVERTS

Channel improvements involving channel expansion upstream of culverts may result in increased sediment deposition near the structure, which in turn may result in decreased hydraulic performance and safety. These conditions are investigated through physical and numerical modeling. An improved understanding of the hydraulic performance of channel expansions is developed, improved performance curves for multiple-barrel box culverts are presented, design guidance for new structures are provided, and potential remedies for existing structures are suggested.