Chesapeake Bay Water Quality/Sediment Transport Model

Objective The Chesapeake Bay Water Quality/Sediment Transport Model (Bay Estuarine Model) simulates estuarine hydrodynamics, water quality, sediment transport, and key living resources such as algae, microscopic animals, bottom sediment dwelling worms and clams, under water grasses, and oyster and menhaden filter feeding.

Developer The Bay Estuarine Model was developed by the US Corp of Engineers (USCOE), USEPA and the Chesapeake Bay Program Office by combining a three-dimensional hydrologic transport model (CH3D) with an eutrophication model (CE-QUAL-ICM).

Contact information Lewis Linker,, 410-267-5741, Chesapeake Bay Program Office, 410 Severn Ave. , Suite 112, Annapolis, MD 21403

Inputs The Bay Estuarine Model uses multiple sources of inputs, including nonpoint source loads from the Bay Watershed Model, point source loads from state and local agencies, atmospheric deposition loads from the Bay Airshed Model, In addition, bank loads for shoreline erosion and wetland loads for oxygen demands are calculated.

Outputs The Bay Estuarine Model predicts water quality resulting from various management scenarios and ensures that allocated pollutant loads under the Bay TMDL will meet jurisdictions’ water quality standards.

User The Bay Estuarine Model is used by USCOE, USEPA and the Chesapeake Bay Program Office for the development and implementation of the Chesapeake Bay TMDL.

Scales of Relevance The Bay Estuarine Model computes intra-tidal transport using a three-dimensional grid framework of 57,000 cells, allowing a subdivision of the tidal Bay into 92 management segments.

Other The Bay Estuarine Model performs the final analysis in the suite of Chesapeake Bay Program models to determine the final load allocations to the Bay jurisdictions for the TMDL, as well as the effect of management scenarios on the water quality of the tidal Bay.

Sponsors/funders USCOE, USEPA and the Chesapeake Bay Program Office.