USGS Chesapeake Bay Activities ViData

Targeting Water-Quality Management Actions	Monitoring Water-Quality Change
USGS SPARROW Model Results: The USGS results from the “SPARROW” models (SPAtially Referenced Regressions on Watershed attributes) of nitrogen and phosphorus are available to understand the spatial distribution of nutrient sources, and their delivery to streams in the watershed and to the estuary. Click here to access the SPARROW data tool or pre select a tributary in the map below to query SPARROW data.	Ground-water Contributions To Streams: Ground water influences nitrogen movement in the Bay watershed and contributes to the “lag time” between implementation of a non-point source management action and improvement in water quality. USGS has developed information about the contribution of ground-water to total stream flow to aid in targeting of management actions. Click here to access the Ground Water Base Flow tool or click on the map below to view base flow values.	Sediment Results: The USGS has analyzed historical data to show the distribution of sediment yields in the Bay watershed and also prepared maps showing the most likely sediment sources contributing to the estuary. Click here to access the USGS Sediment Map tool or click on the map below to view maps.	Water-Quality Trend Data: The USGS leads the CBP partnership in monitoring and interpreting results from the Nontidal Water-Quality Network to help assess the water-quality change in the tributary strategy basins. Click here to access the Trend data tool or click on the map below to pre select a gage to query Trend data.

Targeting Water-Quality Management Actions

Monitoring Water-Quality Change

USGS SPARROW Model Results:

The USGS results from the “SPARROW” models (SPAtially Referenced Regressions on Watershed attributes) of nitrogen and phosphorus are available to understand the spatial distribution of nutrient sources, and their delivery to streams in the watershed and to the estuary. Click here to access the SPARROW data tool or pre select a tributary in the map below to query SPARROW data.

Ground-water Contributions To Streams:

Ground water influences nitrogen movement in the Bay watershed and contributes to the “lag time” between implementation of a non-point source management action and improvement in water quality. USGS has developed information about the contribution of ground-water to total stream flow to aid in targeting of management actions. Click here to access the Ground Water Base Flow tool or click on the map below to view base flow values.

Sediment Results:

The USGS has analyzed historical data to show the distribution of sediment yields in the Bay watershed and also prepared maps showing the most likely sediment sources contributing to the estuary. Click here to access the USGS Sediment Map tool or click on the map below to view maps.

Water-Quality Trend Data:

The USGS leads the CBP partnership in monitoring and interpreting results from the Nontidal Water-Quality Network to help assess the water-quality change in the tributary strategy basins. Click here to access the Trend data tool or click on the map below to pre select a gage to query Trend data.