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Bruce Campbell

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About Bruce Campbell

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  1. SFR Package - Arc interpolation control

    Hi Sean -- I did the SFR2 package construction all in GMS. The segments have to be in order - from upstream to downstream and the GMS MAP module programming does a good job of this. The trick I found was having a good DEM and matching flowlines to work with. Even with all the prep work we did, there we still some segments that had to fixed by hand.
  2. SFR Package - Arc interpolation control

    I'm running with about 8,000 segments in the larger of the 2 model I'm working on. I don't think the type of topography is that important, just get the closed depressions out and make the flowlines match the DEM
  3. SFR Package - Arc interpolation control

    Hi Sean -- What we did recently to get the SFR2 package running was mainly a GIS exercise. We simplified and put all of the streams in a "blanket" type surficial layer that covers the entire active model area. Then we put a Digital Elevation Model (DEM) together of the land surface altitudes and and made it match the model grid - grid-wise. Next, use GIS magic to get the sinks (closed topographic) areas out of the DEM. Use more GIS magic to create flowlines from the DEM. We didn't have any luck with the National Hydrography Dataset - the flowlines don't match the topography and you get some arcs with the downstream ends higher than the upstream ends. When all of the GIS work was done (it's fairly high-level work) we had a DEM and flowlines that world match and work in GMS and were able to get functioning SFR2 packages. There are several advantages to the SFR2 package over the Drain or River packages - the primary one being the removal of the "infinite" term in the equation that lets the Drain and River packages take or add as much water as the head differences and conductivity allows. The SFR2 budget is limited to the groundwater that has been discharged to the stream and any surface water volumes that are directly applied.
  4. MODFLOW 6

    FYI - A new version of MODFLOW was posted on the USGS page yesterday: https://water.usgs.gov/ogw/modflow/6beta.html
  5. PEST Variables - Drain Conductance

    Hi -- I'm using PEST to estimate MODFLOW Drain Package conductance terms. I have a number of stream gages where I have analysed the data and calculated the groundwater baseflow component and I'm using these data as observations in PEST. In several of the basins, I have 2 (or more) gages and have a question about the PEST variable. In the stream arcs, I'm setting up a negative number in the attribute table for the conductance term (-201, -202, etc). What is the best procedure to use for having the 2 gages in the same basin. What I've done in the past is have 2 separate variables for the 2 gages. However, it seems like that cuts the simulated flow term at the lower gage. Does anyone have a better procedure?
  6. By any chance is there a Linux-compiled version of the MODFLOW-NWT_h5_64 executable available? I wanted to use a cloud environment to calibrate a GMS created model but the cloud operating system is Linux.
  7. Coordinate Significant Figures

    Hi Michael -- Thanks for the quick response. How about the name of a well or observation point - I have some long names from our database. As much as 30-50 characters with punctuation such as parentheses, pound signs, and periods. Could these long names be a problem? I can replace them with simple consecutive numbers.
  8. Coordinate Significant Figures

    Hi -- How many significant figures does GMS use when assigning coordinate locations for groundwater level observations? I've got a little over 400,000 groundwater level observations in a GMS 10.1.4 model and having trouble using PEST outside of GMS. I think what's happening is GMS is creating duplicate locations for the wells. I have 8 significant figures on the X and Y coordinates and there are no duplicates. However, if GMS is only using the first 2 or 3 of these significant figures in the coordinates, I'll have lots of duplicates.
  9. SFR2 Segment Elevations

    Hi -- I'm using GMS 10.1.4 and having trouble with how GMS is assigning the elevations to SFR2 segments. 1) I have all of the SFR2 arcs in the top layer. 2) Created the top elevation of the top layer and the SFR2 "Elevup" and "Elevdn" from the same raster. 3) Interpolated the raster to a 2D Grid and imported that into the Top Elevations for Layer 1 4) Used same raster for the "Elevup" and Elevdn" fields in the SFR2 attribute table in the Map Module. Mapped the coverage to MODFLOW The problem I'm having seems to center on how the SFR2 elevations are produced when the "Map to MODFLOW" comand is run. I'm getting thousands of errors - "the stream elevation is below the cell bottom" When I check the raster (the same one is used to produce the top elevation of the upper layer and the SFR2 "Elevup" and Elevdn") the top elevation honors the raster. However, the elevations produced from the raster by the SFR2 process (Map to MODFLOW) are, in many cases lower or much lower than the raster. Ideally, I would think that the two different elevations 1) the top of the top layer and 2) the SFR2 segment elevations would match closely, since they were derived from the same raster. Any insights would be appreciated.
  10. New Version of MODFLOW-NWT

    Hi -- There's a new version of MODFLOW-NWT that was posted on the USGS Office of Groundwater web page this month: http://water.usgs.gov/ogw/modflow-nwt/ This is version 1.1.2 I noticed the H5 version in GMS is 1.0.9
  11. Assign Water-Level Observations from Wells to Aquifers

    Got a solution using the Multi-Node Well1 (MNW!) package. Set the MNW1 package coverage up using the top and bottom of the well screen(s) and map the coverage to MODFLOW. Switch to the IJK view mode in the MODFLOW MNW1 package and there are the layer assignments (K). I J K Name 475 513 3 AK- 28 396 536 3 AK- 30 478 62 3 AK- 31 476 59 3 AK- 32 292 261 5 AK- 36 274 298 5 AK- 37 384 198 3 AK- 38 243 291 3 AK- 41
  12. I've got several thousand wells with single or multiple groundwater levels that I want to use for model calibration purposes. The problem is assigning the wells to the 5 aquifers in the model. I have coordinates and the altitude of the top of the top screen and the altitude of the bottom of the bottom screen. We constructed the framework for the model in ARCHydro so I don't have solids in GMS. Is there an automated way to assign the wells to the aquifers or is it one-by-one by hand? But maybe there's a way to do it ARCHydro?
  13. Hi -- I've got an existing GMS MODFLOW model with a lot (hundreds) of wells that have associated transient pumping data. The model is about 8 years out of date and I need to add new water-use data to the existing wells in the GMS files. Was thinking I could export the data from the Map coverages and maybe pull the old data into an Access database and put the new data together with the old data. However, when I export the coverage with the old data from GMS and take a look at the *.dbf file, all of the flow rates are 0.0. Any ideas?
  14. Export Native Text Files

    Thanks Bill, this worked very well. I didn't notice it in the Global Options menu. Probably lot's of things in there I'm missing!
  15. Surface Water Packages - Assigning Altitudes

    Hi Alan -- That would be great!