The data obtained from several municipal watermains corrosion studies in the Province of Ontario is presented. This data corroborates the findings of a previous study indicating that the galvanic couple formed by the connection of the copper service piping to watermain is a principal factor controlling the watermain corrosion rates. Soil electrical resistivity is found to be of major importance where this galvanic couple exists. A simple means of estimating the integrity of a watermain based on soil resistivity and service type is also presented.
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