A model, CE-QUAL-W2 Version 3 (Wells, 1997), is being used to model the river-reservoir system. The computer model is a two dimensional, laterally averaged, hydrodynamic and water quality model. In order to model the river-reservoir system, the following data were required:

> - Inflows and inflow temperatures to the reservoirs
> - Meteorological conditions in the watershed
> - Bathymetry of the reservoirs and the Bull Run River
> - Reservoir spillway flows
> - Flows diverted for power generation and to meet water supply requirements
> - Characteristics of the withdrawal structures for both reservoirs