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1e!o Abstract A computer package is built to simulate groundwater flow in the Boeoticos Kifissos River Basin.

This is carried out by a research team at the NTUA within the frame of the project entitled Modernization of the supervision and management of the water resources for water supply of Athens . Stochastic groundwater flow simulation and forecasting is based on the MODFLOW model of the USGS which had been calibrated in a previous study by the Ministry of Environment, Town Planning and Public Works. Suitable computer programs are written to adapt the model package to the operational needs which include stochastic simulation of rainfall. Finally, the adapted package is applied to the karstic aquifer system of Boeoticos Kifissos Basin for a typical scenario with average hydrologic conditions and projected water requirements for irrigation and water supply within the basin and high (and zero) withdrawals through the Vassilika C Parori boreholes which supply water to Athens. ii iii ???y?r???k?h???????T? ?s?!?@?)?6?1?? i Abstract i