§ Mrs. Anne CampbellTo ask the Secretary of State for the Environment (1) what was the annual rate of replenishment of chalk, limestone and sandstone aquifers in(a) 1970, (b) 1980 and (c) 1990;
(2) what assessment he has made of run-off from the land as a proportion of the annual rainfall in England and Wales and by water authority for the year 1964, 1970, 1980 and 1990.
§ Mr. AtkinsThe available data, which are not in precisely the form sought, are published annually in "Hydrological Data UK" by the Institute of Hydrology and the British Geological Survey.