Studies of the populations of coliforms and faecal streptococci in sewage and sewer sediments have been carried out in Dundee. Samples have been obtained and tested by standard methods from five storm and five dry weather flow events. The temporal variation of bacterial populations and concentrations during both types of flow regimes found are discussed in relation to flow rates and other relevant parameters. Average daily variations of bacterial concentrations are proposed for dry weather flows. No consistent pattern of bacterial population variation was found for storm events. No interpretation of the data for sediments was possible.

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