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Concentrations of phosphorus in bed sediment generally increased from the headwaters of the Winooski River to the watershed outlet. Average concentrations of phosphorus in bed sediments were 20 percent higher in urban and agricultural areas than in forested areas. Fine-grained bed sediment (silt and clay) had 60 percent higher concentrations of phosphorus, on average, than coarse-grained bed sediment (sand). Flow regime strongly influenced sediment grain size. Bed sediment in impoundments consisted of fine sand, silt, and clay, whereas sediment in depositional zones in freeflowing reaches of streams consisted of medium and fine sands. BACKGROUND

Distribution of phosphorus in bed sediments of the Winooski River watershed, Vermont, 1997