Variation in flow and flow quality from a semi-arid urban watershed.
Gibson, Robert Mark
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This study had two major objectives. The first objective consisted for the utilization of various predictive flow models to predict the total volume and peak runoff from a gaged watershed. The predictive flow models utilized were the rational method, the Viessman and Miller method, the Viessman, Keating, and Srinivasa method, and the British Road Research Method. Using three storms of varying characteristics, the total runoff volume and peak flow from the predictive models were compared to the observed total runoff and peak flow in each case. The second major objective of the study was the utilization of regression analysis to ascertain whether or not predict relations could be derived to relate individual pollutant concentrations to dry weather flow volume; and individual dry weather flow pollutant concentrations to antecedent storm characteristics. The individual pollutant concentrations utilized were COD, BOD, total solids, suspended solids, phosphates, and nitrates. The antecedent storm characteristic consisted of duration of antecedent event, amount of antecedent event, days since antecedent event, and average intensity of antecedent event.