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Experimental efforts to aerate the Avon River with small in-stream dams

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Title: Experimental efforts to aerate the Avon River with small in-stream dams
Author: Bacchus, A.
Abstract: As part of the Stratford-Avon River Environmental Management Project, the Water Resources Branch of the Ontario Ministry of the Environment carried out investigations on August 26-27, 1980 on the Avon River at a weir and a small rock dam at two separate locations to quantify the increase in dissolved oxygen (DO) due to aeration at the base of these dams. Further studies were carried out during the summer of 1981, in the Project's experimental reach, to test for aeration efficiency using four weir designs with a maximum height of 0.5 m. Data from these surveys were then used as input for the DOMOD3 DO-BOD model to predict how far downstream the effects of the dam and weirs would persist. Survey results indicate that aeration is a function of height and turbulence. Since height is a limiting factor in the Avon. River, because of the flat river banks, the 5-step design with a height of 0.5 m seems to be the best aerator for the Avon River. The modeling results indicate that the effects due to weir aeration persist from 43 m to 1281 m before DO drops below the Provincial Water Quality Objective of 47% saturation (approximately 4 mg/L minimum) and from 470 m to 1537 m before returning to background levels.
Date: 1982
Rights: Queen's Printer for Ontario, Crown Copyright, Non-Commercial Use Permitted
Rights Holder: Queen's Printer for Ontario

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