Abstract
ON reading through the D.S.I.R. report of the Water Pollution Research Board for the year ended June 30, 1938, I was much interested to notice the account of the settling of silt in estuarial waters of the River Mersey. In the course of a study of the effect of sewage upon the rate of sedimentation of mud, it was found (p. 49) that sedimentation occurred only at slack water. The scour during the ebb and flow of the tide erodes fine particles from the bottom so that they disperse more or less uniformly in the water. During slack water, practically the whole of the suspended matter is deposited. It was found that large, fragile aggregates form and then settle at a rate of about 0.011 ft. per sec.
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