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What does SDR stand for?

SDR stands for Sediment Delivery Ratio

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This fraction is the sediment delivery ratio (SDR) and is defined by Robinson (1977) as `the percentage of the sediment delivered at a location on the stream system to the gross erosion of the basin', where SDR (%) is inversely proportional to catchment area and gross erosion is the sum of all forms of erosion in the contributing catchment including gully, rill, and sheet erosion.