The results of three years operation of two large natural grassed lysimeters on Bunter Sandstone are described. Recharge measured each year by both of the lysimeters is greater than that calculated using rainfall, evaporation estimates and a root constant of 75 mm. The mean measured recharge indicates that the calculated "actual evaporation" may be 13% too high. A value of root constant of 35-50 mm seems appropriate for short grass in this area. The result highlights the inadequacy of the "rainfall less evaporation" calculation as a means of determining recharge within reasonable limits in areas where rainfall and evaporation are of the same order such as in the groundwater areas of the U.K. or semi-arid areas of the world. © 1977.
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