Please visit the following pages to download water-quality modeling data:
Across North Carolina, excessive sediment and nutrient loading has contributed to the degradation of surface-water quality. To further understand the influence of human activities and natural processes on surface-water quality, the U.S. Geological Survey (USGS) developed the SPARROW (SPAtially Referenced Regressions On Watershed attributes) modeling framework to relate water-quality monitoring data to upstream nutrient and sediment sources and watershed characteristics. The model can be used to predict pollutant concentrations, loads, and yields in streams and these predictions are the basis for the North Carolina Water-Quality Model Mapper. The mapper can be used to evaluate alternative hypotheses about the relative importance of various pollutant sources.
Data collected at 235 water-quality monitoring stations throughout the state were used to inform the SPARROW model for North Carolina. The NC Water-Quality Model Mapper displays yields and source shares for sediment (using total suspended solids as a surrogate for sediment processes), total nitrogren, and total phosphorus. This work aims to support conservation efforts by assisting with the identification of watersheds with a maximum water-quality restoration potential.
Please select a HUC 8 Watershed on the State View map to view the Local View map.