Hey, I have a problem, when I use the drain package. I want to model streams with the drain package in the form of polylines. Additionally, I want to apply a general form of draining using the drain package in the form of polygons. However, when I map both coverages to MODFLOW NWT, the model writes: Array allocation failed: ilupc-iluk. What does this mean? I have tried mapping each coverages separately and when MODFLOW NWT as no problem running :S Best regards Merete