Water-Quality Assessment of Part of the Upper Mississippi River Basin, Minnesotaand Wisconsin. Nitrogen and Phosphorus in Streams, Streambed Sediment, and Ground Water, 1971-94

摘要

This report describes the major sources and sinks of nitrogen and phosphorus tothe study unit, concentrations in part of the Upper Mississippi River and its tributaries, concentrations in the major aquifers within the study unit, stream loads and yields, and seasonal and temporal trends in stream concentrations using historical data collected by Federal, state, and local agencies. Relations between nutrient concentrations and land use and land cover, surficial geology, and well depth also were examined.