In the above paper an error appeared in equation (11) on page S44, namely that estimates of hydraulic conductivity (K) are in metres/second and not metres/day as stated.

We are grateful to Mr M. Price for bringing this error to our attention. A full discussion of the implications of the error will appear in Volume 28, part 4 of the Quarterly Journal of Engineering Geology. Volume 28, part 3 will be a thematic issue including the findings of the Engineering Group Working Party on the Description and classification of Weathered Rocks for Engineering Purposes.

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