Chesapeake Bay Watershed Model

The Chesapeake Bay Watershed Model includes 2,000 segments that represent the 64,000-square-mile Chesapeake Bay watershed. It is designed to capture hydrologic model processes within the watershed, including flow routing, nutrient fate and transport, and nutrient removal from best management practices (BMP), among others. Each of the 2,000 segments includes several sub-models: (i) a hydrologic sub-model that calculates runoff and sub-surface flow; (ii) a non-point source sub-model that estimates soil erosion and pollutant loads; (iii) a river sub-model that routes flow and pollutant loads.

Chesapeake Bay Program
Model Information
For more information about this model, go to
Spatial Resolution
The spatial resolution has an average segment size 66 square miles with a variable grid size.
Temporal Resolution
Time step are 15-minute. Output is recorded as seasonal or annual averages.
Model outputs include simulated nutrient and sediment loads.
Intended User
Model Type
Inclusion of Climate Change
Climate conditions are incorporated though the scenarios developed in the scenario builder.
Geographic Region
Chesapeake Bay
Data Requirements
data provided by the user
Source Code Availability
closed source
Computational Burden
Scenario Modeling
batch mode described
Coding Language
Operating System
not applicable
Mathematical Approach
numerical, simulation
Maintenance Plan
Date of Last Known Update
not available
User Manual
go to documentation at not available