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Porosity in MODFLOW


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As I understand it, porosity is not used in MODFLOW, but the areal Layer Properties in GMS allows you to set a value for porosity to a layer. I had always thought that this value was ignored, until recently I came across a simple MODFLOW model that wouldnt converge. It turned out that a textbook value for porosity was assigned to each of the layers. When the porosity value was removed, the model ran and convereged just fine. Is porosity being used in MODFLOW?

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