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Posts posted by tlillys

  1. Thanks for the response.  The drains are mapped via polygons and the drain elevation raster pixels are ~253m x 253m (derived from smoothed 1arcsec DEM) and the FD grid cells are 250m x 250m. Where the drains are applied are relatively flat, so I was hoping for better agreement.  The seepage face option sounds promising - much easier to implement and less data dependence.

  2. I have created a number of drains and getting 160 errors were the mapping of the drain elevation is bad. The raster value is the (surface elevation - 1m) [highlighted in lilac] is 13.1m.

    Cell elevation (based on surface elevation raster) is 14.18 m, bottom is 12.0. The mapped drain elevation is 11.3. WTH? I've deleted and recreated and mapped MODFLOW 3 times, no change.



  3. My solution was to use QGIS to first create a raster from the DEM that followed the rules above. Then I created a polygon shape for the entire grid and then used the Difference algorithm to cut away the other features in the region that are represented by polygon shapes, one by one, first the ocean, rivers, green and red areas, leaving a polygon that represented the exposed clay layer at the surface.  I imported the polygon shapes and used the raster to define the CHD head stage value.

  4. I would like to be able to export the MNW1 package to a shape file or some other format. Or create point features. Is that possible?

    Not every modeling project begins from scratch. Many times you start with someone else's model (say a USGS model) and want to develop the map data/feature objects from that model.  It seems like GMS doesn't serve that pathway of development well.

  5. 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


       Constant head = BOT + (TOP - BOT) * 0.1

    Any help on a process for accomplishing this task would be greatly appreciated.




  6. I am attempting to import a SEAWAT V4 model from USGS (This archive contains SEAWAT-2000 input and output files for the ground-water flow model described in USGS Scientific Investigations Report 2009-5039, "Simulation of groundwater flow in the Coastal Plain Aquifer System of Virginia" by C.E. Heywood and J.P. Pope.).  The model runs to completion and the output is consistent with the report.

    The NAM file contains the VDF package for transport [I had to move the DATA(BINARY) records to the end as the translator didn't like them upfront to import the model].  The VDF package was not recognized during the import process. 

    Any ideas for trouble shooting this problem?

    GMS 10.2.2 (64-bit)
    Build Date: Nov 14 2016

    Registration info attached





  7. Hi all

    I will be trying to develop cross sections and a solids model from 100 - 200 boreholes.  I wanted to see how robust the auto process was in GMS.  So I used the data from the TPROG tutorial  with the Stratigraphy Modeling-Horizons and Solids tutorial.  When I got to the Horizons -> Solids step I got the following error. I double checked that I completed all the steps a couple of times but always got the same result.  Any bright ideas out there?




  8. Refining a regional steady-state model where the local grid boundary intersects rivers and drains (see image). I went through the tutorials for SS refinement. This model departs from that example in a couple of ways - flow field is not nicely uniform in area; and MF BCs are intersected.  I created 4 arcs initially to set up the boundary of the local model. Then I started to wing it - created nodes at each intersection of 1' head contours to map constant heads to the arcs but I'm thinking that may not be the best way to go.

    Any suggestions on a strategy for mapping the heads and the BCs to the local model are much appreciated.



  9. Update - some confusion on the client's part. They were trying to install Arc Hydro which would require ArcGIS.  Not sure if they have successfully installed GMS yet. Stand by...


    I'm asking this question on behalf of a client - they are upgrading their GMS license to 10.4 (I believe that's the version - waiting for confirmation) with a single-user USB dongle. During the installation process of GMS, the installer asks for a ArcGIS license.  They don't have one.  What circumstances would require a license to ArcGIS? Is there a work around?



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