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Hi all, I am not a constant user of GMS so I am often re-learning data processing techniques. I am looking for help with a procedure to accomplish the following objective. I have a 10 layer, steady state flow model of a coastal plain. The top layer predominantly represents a confining clay layer (material 1 in brown) with several small discontinuous regions where the underlying aquifer is exposed (material 2 in green) and some inactive regions (in red). Regions where the underlying aquifer are exposed have specified values for recharge (using polygon feature objects derived from shapefile). Other BC's are defined on the top layer: (CHD for ocean - in cyan; rivers in blue; drains appearing only in material 2 - not shown). I would like to specify a constant head in layer 1 equal to (TOP-1m) for every cell where clay is present but not interfere with other BCs subject to the following constraints: If (TOP -1) > BOT, Constant head = TOP - 1 Else Constant head = BOT + (TOP - BOT) * 0.1 Any help on a process for accomplishing this task would be greatly appreciated. Thanks Ted