Layer Elevation File

Because the MODFLOW-96 input data do not always contain layer top and bottom elevations, an extra text file is needed to supply these data for Model Viewer. This file is known as the layer elevation file and must contain the following information.


Item 1 -- Confining Bed Codes. One number for each model layer. Free format.


Item 2 -- Elevation of top of layer 1 (top layer). Use MODFLOW 2D array reader format.


Item 3 and onward (for each layer or quasi-3D confining layer) -- Elevation of bottom of layer or quasi-3D confining layer. Use MODFLOW 2D array reader format.

 

For example, if the model grid has 5 layers, and layers 1 and 3 have quasi-3D confining layers, then the layer elevation file might look like the following (words after the # symbol on the right are explanations and not part of the file):

1 0 1 0 0 #confining bed codes constant 250.0 #top of model constant 150.0 #bottom of model layer 1 (top layer) constant 120.0 #bottom of layer 1 confining bed open/close lay2.bot 1.0 (free) #bottom of model layer 2 open/close lay3.bot 1.0 (free) #bottom of model layer 3 external 34 1.0 (free) #bottom of layer 3 confining bed external 35 1.0 (free) #bottom of model layer 4 open/close lay5.bot 1.0 (free) #bottom of model layer 5

Note that the "open/close" method may be used only if the file is not listed in the name file. If a file is listed in the "name" file, then use the "external" method and specify the same unit number as that in the "name" file.