Predicting Dissolved-Oxygen Variations Downstream From An Intermittent Discharge

Intermittent discharges from unsatisfactory overflows and storm-sewage tanks to a watercourse can lead to depleted dissolved-oxygen concentrations downstream from the discharge point.
This paper assesses the accuracy and applicability of a simplified dynamic river-impact model which predicts BOD and dissolved-oxygen concentrations downstream from an intermittent discharge. The proposed model (a) requires relatively little input data, (b) is internally simple, and (c) uses well-known and established predictive equations. Concentrations of dissolved oxygen are predicted to within a mean error of 0.1 mg/l during post-storm conditions and 0.5 mg/l during actual storm conditions.