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activate cells in coverages leaves more active cells in layer 1 than the rest


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I have created a grid using the Map->3D grid command. However when i go to us the activate cells in coverages command, I am left with more active cells in layer 1 than in the other layers. For example when i look at the IBOUND array for the cells in row 6 column 11, the IBOUND is 1 in layer 1 and 0 in the remaining layers. This happens at numerous locations around the boundary of the model domain. Any suggestions on how to easily fix this?

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This occurs if you have the "use to define model boundary (active area)" box checked in ANY coverage in addition to your activation coverage. This is a common problem at the moment, because if you select "layer range" in a coverage, it automatically checks the "..active area)" box. A bit annoying really. It will cause the activation errors whether you map the coverage to the model or not, so make sure you check ALL of your coverage.

Edited by Rob Virtue
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