The tidal rivers of the Humber Estuary System experience depletion of dissolved oxygen in dry, summer weather as a result of the pollution received from effluent discharges and the rivers of industrial Yorkshire. A suite of mathematical models has been developed to predict dissolved oxygen saturation and the concentration of related substances. Computer simulations using the models have been carried out to assess the effects of freshwater flow and oxidisable pollutants on dissolved oxygen levels in the estuary system. The models provide a practicable, water quality management tool for the Humber Estuary.

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