Developer Central
EPA's Developer Central is a resource for developers who are interested in building applications using EPA data and Web services.

Chesapeake Bay 303(d) List Segments

Segmentation is the compartmentalization of the estuary into subunits on the basis of selection criteria. Generally, segments reflect certain unique physical, chemical, or biologcal...

Hydrology and Water Quality Stations

The Phase 5.3 Bay Watershed Model segments are defined such that segment outlets are in proximity to in-stream flow gauging and water quality monitoring...

Depth of the Chesapeake

Data reflect Water Quality Model cell depth. Model computes continuous three-dimensional velocities, surface elevation, vertical viscosity and diffusivity, temperature, salinity, and density using time...

HGMR

Generalized lithology (rock type) and physiography based on geologic formations were used to characterize hydrogeomorphic regions (HGMR) within the Chesapeake Bay watershed. These HGMRs...

Nitrogen Effectiveness

Sub-basins across the Chesapeake Bay watershed with the highest (red) to lowest (blue) pound for pound nitrogen pollutant loading effect on Chesapeake Bay water...