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  1. Today
  2. Kirk

    Problems Assigning Horizons with complex model

    Yes, start simple and carefully plan horizon numbering and sequencing.
  3. Kirk

    draining water to the ground using canals

    I have used stream flow routing package SFR2 in GMS to model canals. If stages in the canal are above the groundwater elevations they lose water, if canal stages are below the groundwater table, they gain water. Can work quite well, adjusting stream bed conductance to control gain/loss rates.
  4. Kirk

    PEST for stream conductance for each arc

    Aquaveo technical support explained this to me: just enter a different parameter number for the conductance of each arc.
  5. Kirk

    Maximum number of stress periods

    I just created a two year model, with one extra leap year day, having 731 daily stress periods. We decided to use 4 time steps per SP to speed up the run, and it solved just fine with no major error. It has 5 municipal wells with detailed data, but entered as daily rates/stresses. Also had great meteorological data and instrumented monitoring wells in the area. All input was in a daily format. The model runs in about 6 minutes using MODFLOW 2000 in GMS.
  6. Yesterday
  7. Hydrology

    Grid Lines Not Visible

    Sometime over the last few weeks the grid lines for the 3D grid in modflow have stopped being visible. I have been using GMS for many years and have never had this problem. They are visible when you create the grid, but become invisible once you map your model to MODFLOW. They are highlighted in the 3D grid options in the Display Menu, but are still not visible. This started happening on all our computers pretty much at the same time
  8. Last week
  9. Aly

    Stratigraphy

    Thanks Michal for the thoughtful response. We will try this and get back to you if we have questions.
  10. Hydrology

    Maximum number of stress periods

    I would like to know the answer to this as well. I have often had problems trying to use more than 200 stress periods. I don't know if it makes a difference how many time periods you have for each stress period or not.
  11. Michal

    Stratigraphy

    Hi Aly, I think there is no straight forward way to do this in GMS. I would suggest the following procedure: 1. Create the profile as a regular 3d grid with high enough resolution to carry the material information (1 row, many columns, many layers) 2. Export your grid into a text file with the following format: Cell_id X Y Z Y coordinate should be constant for all cells. 3. Swap Y<->Z 4. Import into GIS 5. Digitize the material polygons in GIS in X-Y space 6. Select the cell centers according to the material polygon and asign material ID into a new column in the atribute table (spatial join) 7. Export the atribute table into a text file 8. Copy the material column into a new file and format the new file as GMS 3d dataset format (see GMS wiki for details) 9. Import the new material dataset to the existing 3d grid 10. Select cells in GMS according to the material dataset and specify material properties as you like
  12. Michal

    Flow budget in an unconfined aquifer (MODFLOW)

    Yes, but if the model is steady, than the best approach is to set the initial heads high, because during the consecutive aproximation of the solution the chance of making cell inactive as a result of undershoot is lower. It can happen anyway, but in your case it looks fine. Btw. I think the cells never get rewetted because they are initialy dry.
  13. Aly

    Stratigraphy

    We actually created the attached plot here and that is what I wanted to import into GMS.
  14. Aly

    Stratigraphy

    I have a 2D detailed geological cross section (attached), say in x-z direction, which can be assumed valid along the y-direction. The plot is in tif format (a raster image). Importing this image to GMS will show only, of course, as an x-y plot, which is not helpful for our purposes. I would like to create a solid by using GMS. One tedious idea is to create bore hole logs-based on this cross section and go from there. Is there an easier way to do that? xsec.tif
  15. Farhad

    problem in MODFLOW-AdvancedPest

    It seems you need to separately buy the parallel PEST.
  16. Farhad

    LGR convergence problem

    I am using LGR for part of my model. The problem is that once I run MODFLOW on the parent independently it converges. However, once I run MODFLOW on the coupled parent and child mode it does not converge. I played a bit with the solver options but I didn't succeed. Any suggestion?
  17. Earlier
  18. mbelanger

    SMPDBK Cross Sections Error

    I'm stuck on my model. I've not too familiar with SMPDBK's analysis methods to understand how this is happening but it is. The two cross sections model output gives reasonably accurate information as would be expected from a dam break (minus the area directly below the reservoir itself) but when I add ten more cross sections I would expect a more well defined channel in the results. (Images attached below) To me, it doesn't look like WMS is interpolating between the cross sections quite right, and instead of a flood wave, I seem to have a pool of water with gaps in between the cross sections. Does anyone have any ideas on how to resolve this? Would it be worth going back and rebuilding the model from scratch? Aquaveo Printout12.pdf Aquaveo Printout2.pdf
  19. Lalith

    Initial conditions to MT3DMS

    Hi Sean. Thank you for the suggestion. I will try this and let you know how it goes. Thank you, Lalith
  20. Lalith

    Initial conditions to MT3DMS

    Hi, I have a set of measured Thiophenol concentration values. I can prepare a 3D plume of Thiophenol using 3D Geostatistics tool of GMS (in a 3D grid) in a new GMS project. However, I cannot make this 3D plume grid in an existing model set up that already has both modflow and MT3DMS models in the same region. When I prepare the plume as 3D Grid Data in the same model set up as in modflow and MT3DMS model, GMS requires to delete modflow and MT3DMS 3D grid. The reason why I want to prepare the 3D Thiophenol plume in the same set up as my modflow and MT3DMS model set is because I want to provide the above Thiophonol plume as the initial condition to the M3DMS model? How can I use “3D Data Set -> Grid…” option for this? Or, is my approach to this modeling initial conditions for MT3DMS correct? Please advise me? Any suggestion to resolve this situation is highly appreciated. Thank you, Lalith
  21. mbelanger

    SMPDBK Cross Sections Error

    Thank you for the prompt response. Removing those lines did indeed clear up the immediate issue but adding additional sections muddled the results significantly. It now looks like a series of small detached pools through my channel instead of a flood wave. Not sure the cause but I'll continue refinement of the model on my end. Thanks again for the help.
  22. Saubhagya Singh

    Flow budget in an unconfined aquifer (MODFLOW)

    The figure in my previous comment shows the result when no rewetting was required as initial heads were equal to the higher boundary-head. But in the case where I have initial heads equal to lower boundary-head, the cells near the higher-head boundary never get wetted. I will try some more combinations of wetting parameters.
  23. Michal

    Flow budget in an unconfined aquifer (MODFLOW)

    This result looks good to me. There seems to be no more flooded cells. What about the budget? The wetting capability is turned on in the LPF or BCF package. I usually use the default values first unless there is a problem with convergence.
  24. Saubhagya Singh

    Flow budget in an unconfined aquifer (MODFLOW)

    Hi Michael, Thank you for your answer. Yes, I also think that. I did not have rewetting on. However, I tried various combinations of rewetting parameters but nothing helped. Finally, I had initial heads set to higher boundary-head, which then did not require rewetting and it worked (Figure attached). However, do you have any suggestion how can I have rewetting enabled? I used the wetting parameter as low as 0.01 still rewetting did not happen.
  25. Michal

    Flow budget in an unconfined aquifer (MODFLOW)

    Hi, what about the dry cells in the above picture? Couldn't it be the explanation for what you observe? This could cause reduction in aquifer thickness and reduction of volumetric flow rate therefore. Is rewetting on?
  26. Chris Smemoe

    SMPDBK Cross Sections Error

    WMS is looking for something like the following lines in your .out file: RVR MILE MAX FLOW MAX ELEV MAX DEPTH TIME(HR) TIME(HR) TIME(HR) FLOOD FROM DAM (CFS) (FT-MSL) (FT) MAX DEPTH FLOOD DEFLOOD DEPTH(FT) ******** ******** ******** ******** ******** ******** ******** ******** .00 1214514. 5331.49 97.20 2.00 .00 .00 10.00 1.02 989023. 5331.49 109.32 2.07 .00 .00 10.00 2.57 952856. 5331.49 116.03 2.18 .00 .00 10.00 4.48 943327. 5299.28 125.07 2.23 .00 .00 10.00 8.83 933894. 4927.86 68.22 2.37 .37 5.44 10.00 10.35 924555. 4805.21 25.51 2.97 1.18 5.76 10.00 11.55 915310. 4736.06 20.70 3.00 1.25 5.76 10.00 12.24 906157. 4709.49 20.14 3.03 1.43 5.59 10.00 Your .out file has the following lines with a warning: RVR MILE MAX FLOW MAX ELEV MAX DEPTH TIME(HR) TIME(HR) TIME(HR) FLOOD FROM DAM (CFS) (FT-MSL) (FT) MAX DEPTH FLOOD DEFLOOD DEPTH(FT) ******** ******** ******** ******** ******** ******** ******** ******** CANNOT CONVERGE ON A TAILWATER DEPTH WHICH IS LESS THAN THE HEADWATER DEPTH EVEN WITH 90% SUBMERGENCE (Q= 1465.1 HW= 2.08 Y= 1.60 ) SUGGEST YOU INCREASE SLOPE OR MODIFIY CROSS SECTION .00 1440. 5479.86 2.06 2.00 .00 .00 10.00 16.91 78. 5173.31 2.68 69.72 .00 .00 10.00 You should be able to remove the 3 lines between the headers and the start of the first number in your .out file so you have the following text and it should read into WMS fine: RVR MILE MAX FLOW MAX ELEV MAX DEPTH TIME(HR) TIME(HR) TIME(HR) FLOOD FROM DAM (CFS) (FT-MSL) (FT) MAX DEPTH FLOOD DEFLOOD DEPTH(FT) ******** ******** ******** ******** ******** ******** ******** ******** .00 1440. 5479.86 2.06 2.00 .00 .00 10.00 16.91 78. 5173.31 2.68 69.72 .00 .00 10.00 I'd also recommend adding additional cross sections to your model so you have more computed flood depth values along your centerline. Adding additional cross sections might fix the warning in your .out file. Let me know if I can help with anything else. Chris
  27. Saubhagya Singh

    Flow budget in an unconfined aquifer (MODFLOW)

    Here is an example of a single-density flow width domain length as 53 cm, hydraulic conductivity as 20 cm/min and boundary heads as 21 cm and 22 cm. Theoretical calculation based on Darcy's law yields 8.11 cm^2/min, however, the flow budget in the model described below shows 7.9186 cm^2/min as the flow near the inland boundary which is exactly the value we would obtain if we consider a confined aquifer of thickness 21 cm and other parameters same as above. This suggests that flow budget does not account for the flow above the elevation equal to the lower boundary head. Also, there are not velocity vector generated in that region. Any guidance on how to proceed to get the accurate flow budget for the unconfined aquifers will be helpful.
  28. mbelanger

    SMPDBK Cross Sections Error

    Hello, I come across an error while trying to read the SMPDBK simulation into WMS (v.10.0). I've run SMPDBK through dosbox to the point of completion (prompt "Stop - Program terminated.") and the output file says that it completed the analysis. However, when I attempt to read the solution the following message prompt pops up "No file cross sections exist. The output file cannot be read." I have all of the xsection and input/output files in the same directory so I'm not entirely sure why I am getting this error? Any suggestions? I've attached the output file if needed. SMPDBK.OUT
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