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Perry performed his PhD research at Deltares, VU University Amsterdam, Wageningen University (WUR) and Flinders University - National Centre for Groundwater Research and Training (Adelaide, Australia).
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In the Dutch delta, he examined saline seepage systems that are important for the present and future freshwater supply in the Netherlands.
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The study consisted of two parts:
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(1) preference saline seepage from wells in deep polders;
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(2) rainwater lenses in saline seepage areas.
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A digital version of the PhD thesis can be downloaded here