T.C. Atkinson writes: Highway drainage has long been recognized as a hazard to groundwater abstractions (e.g.Atkinson & Smith 1974; Price et al. 1992; Hiscock et al. 1995). Lacey & Cole (2003) have performed a valuable service by setting out clearly the methods and data sources from which the risk of a spillage from road or rail tankers can be estimated. Their road example indicates a frequency of about one spill in 740 years per km of trunk road outside built-up areas. Expressed in this way, as an average recurrence interval between spills on...

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