Pennsylvania and the Chesapeake Bay Watershed
USGS Releases new fact sheet on conservation practices
Your land, your water—Using research to guide conservation practices on local farms in the Chesapeake Bay watershed
USGS Evaluates Effects of Agricultural Conservation Practices
A new study on best management practices and nitrogen in streams of the Chesapeake Bay Watershed
Groundwater is a major source of nitrate to Chesapeake Bay
Land use, organic carbon in soils, and geology can explain where groundwater contributions are the most important
Removal of Legacy Sediments Effects Nutrient Loads in Streamflow
Effects of Legacy Sediment Removal on Nutrients and Sediment in Big Spring Run, Lancaster County, Pennsylvania, 2009–15
USGS provides monitoring, analysis, modeling and research on streams and water quality to better understand the fate and transport of nutrients and sediment to the Susquehanna and other rivers, and their tributaries, and eventually to the Chesapeake Bay. Additional research focuses on emerging contaminants and other stressors that effect human and aquatic life in the watershed and estuary.
The Susquehanna River drains the largest watershed (48 percent) and supplies 55 percent of the freshwater flowing into the Chesapeake Bay. In 2010, the largest and most complex total maximum daily load (TMDL) in the Nation was initiated in the Chesapeake Bay for nitrogen, phosphorus, and sediment. These pollution allocations were further divided by major river basins and states. Pennsylvania contributes approximately 44 percent of the nitrogen load and 24 percent of the phosphorus load to the Bay (Chesapeake Bay TMDL Document).
Also see regional science at Chesapeake Bay Activities
Susquehanna River Story — What does the science say about water quality?
Narrated presentation that provides a unique synthesis of the story of nutrient water quality in the Susquehanna watershed.
A Generalized Additive Model approach to evaluating water quality: Chesapeake Bay Case Study A Generalized Additive Model approach to evaluating water quality: Chesapeake Bay Case Study
Variable impacts of contemporary versus legacy agricultural phosphorus on US river water quality Variable impacts of contemporary versus legacy agricultural phosphorus on US river water quality
Toward explaining nitrogen and phosphorus trends in Chesapeake Bay tributaries, 1992-2012 Toward explaining nitrogen and phosphorus trends in Chesapeake Bay tributaries, 1992-2012
Spatial and Temporal Patterns of Best Management Practice Implementation in the Chesapeake Bay Watershed, 1985–2014 Spatial and Temporal Patterns of Best Management Practice Implementation in the Chesapeake Bay Watershed, 1985–2014
Spatially referenced models of streamflow and nitrogen, phosphorus, and suspended-sediment loads in streams of the northeastern United States Spatially referenced models of streamflow and nitrogen, phosphorus, and suspended-sediment loads in streams of the northeastern United States
Estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology Estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology
Thresholds of lake and reservoir connectivity in river networks control nitrogen removal Thresholds of lake and reservoir connectivity in river networks control nitrogen removal
Optimal hydrograph separation using a recursive digital filter constrained by chemical mass balance, with application to selected Chesapeake Bay watersheds Optimal hydrograph separation using a recursive digital filter constrained by chemical mass balance, with application to selected Chesapeake Bay watersheds
Spatial and temporal variation of stream chemistry associated with contrasting geology and land-use patterns in the Chesapeake Bay watershed—Summary of results from Smith Creek, Virginia; Upper Chester River, Maryland; Conewago Creek, Pennsylvania; and Di Spatial and temporal variation of stream chemistry associated with contrasting geology and land-use patterns in the Chesapeake Bay watershed—Summary of results from Smith Creek, Virginia; Upper Chester River, Maryland; Conewago Creek, Pennsylvania; and Di
Decadal-scale export of nitrogen, phosphorus, and sediment from the Susquehanna River basin, USA: Analysis and synthesis of temporal and spatial patterns Decadal-scale export of nitrogen, phosphorus, and sediment from the Susquehanna River basin, USA: Analysis and synthesis of temporal and spatial patterns
Sediment transport and capacity change in three reservoirs, Lower Susquehanna River Basin, Pennsylvania and Maryland, 1900-2012 Sediment transport and capacity change in three reservoirs, Lower Susquehanna River Basin, Pennsylvania and Maryland, 1900-2012
Flux of nitrogen, phosphorus, and suspended sediment from the Susquehanna River Basin to the Chesapeake Bay during Tropical Storm Lee, September 2011, as an indicator of the effects of reservoir sedimentation on water quality Flux of nitrogen, phosphorus, and suspended sediment from the Susquehanna River Basin to the Chesapeake Bay during Tropical Storm Lee, September 2011, as an indicator of the effects of reservoir sedimentation on water quality
USGS provides monitoring, analysis, modeling and research on streams and water quality to better understand the fate and transport of nutrients and sediment to the Susquehanna and other rivers, and their tributaries, and eventually to the Chesapeake Bay. Additional research focuses on emerging contaminants and other stressors that effect human and aquatic life in the watershed and estuary.
The Susquehanna River drains the largest watershed (48 percent) and supplies 55 percent of the freshwater flowing into the Chesapeake Bay. In 2010, the largest and most complex total maximum daily load (TMDL) in the Nation was initiated in the Chesapeake Bay for nitrogen, phosphorus, and sediment. These pollution allocations were further divided by major river basins and states. Pennsylvania contributes approximately 44 percent of the nitrogen load and 24 percent of the phosphorus load to the Bay (Chesapeake Bay TMDL Document).
Also see regional science at Chesapeake Bay Activities
Susquehanna River Story — What does the science say about water quality?
Narrated presentation that provides a unique synthesis of the story of nutrient water quality in the Susquehanna watershed.