PT Unknown AU Klock, H Külls, C Udluft, P TI Estimating recharge values using hydrochemical and geological data: a case study from the BT Impact of Human Activity on Groundwater Dynamics: Proceedings of an International Symposium (Symposium S3) Held During the Sixth Scientific Assembly of the International Association of Hydrological Sciences (IAHS) at Maastricht, The Netherlands, from 18 t PY 2001 BP 25 IS 269 ER