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Reservoir water quality models are routinely used to simulate effects of hydrology, meteorology, pollutant loadings, and project operations on reservoir water quality.
BATHTUB allows users to apply a series of steady-state models in a spatially segmented hydraulic network to predict euthrophication responses in lakes and reservoirs. Supporting programs FLUX and PROFILE facilitate estimation and nutrient loading and water quality conditions, respectively.
Two time-varying mechanistic reservoir models have been developed and are maintained and distributed for outside use: CE-QUAL-R1, a one-dimensional, vertical model; and CE-QUAL-W2, a two-dimensional (vertical and longitudinal), laterally-averaged, hydrodynamic and water quality model. These two models are widely used by the Corps of Engineers, other federal and state agencies, the private sector, and agencies in other countries. A model of reservoir tailwater quality has been developed. The Tailwater Quality Model (TWQM) computes the steady-state, longitudinal (i.e., along the stream reach) distribution of water quality downstream of a reservoir. TWQM focuses on dissolved oxygen and other constituents (e.g., reduced iron and manganese, ammonium, and sulfide) that typically cause water quality concerns immediately downstream of deep reservoir releases. The model can be applied relatively quickly in a user-friendly environment on a personal computer. TWQM can be used to evaluate the effects of altering reservoir releases, such as adding hydropower, and to estimate the amount of tailwater required for natural recovery to better water quality conditions.
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