Mixing Zone Evaluation
Mixing zones are limited areas or volumes of water where ambient concentrations of water quality constituents may exceed acute or chronic water quality standards. They are often employed when effluent quality does not meet surface water quality standards. Estimating the initial effluent dilution in a mixing zone can be accomplished using mathematical models or dye studies (existing discharges only). HydroQual has extensive experience in computing effluent dilution with near-field modeling programs supported by the USEPA such as PLUMES and CORMIX. HydroQual has also employed other modeling approaches to analyze initial dilution for mixing zones based on steady-state and time-variable, far-field models coupled with hydrodynamic, sediment transport and receiving water quality evaluations.