Possible correction needed to Compliance Document E1 Surface Water

A printing error has been detected in some versions of Compliance Document E1, which relates to surface water.

Verification Method E1/VM1 in the document includes the following formula in Paragraph 2.1.1 for calculating surface water run-off:


In some versions of the document, including the version available on our website until 29 April 2009, the summation sign was inadvertently omitted in converting the file for publication.

If you have a hard copy of Compliance Document E1, please check the formula and if necessary add the summation sign as given above.