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A nwnerical model was developed for _,,e in performance assessment studies at the INEL. The numerical mode_ referred to as the FLASH computer code, is designed to simulate two.dimensional fluid flow in fractured.porous media. The code is specifically designed to model variably saturated flow in an arid site vadose zone and saturaled flow in an unconfined aquifer. In addition, the code also has tt, le capability to simulate heat conduction in the vadose zone. This report presents the following.'

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