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  1. Yesterday
  2. I am working on a site that has transient/perched water above the saturated zone. Is this possible in MODFLOW? I have read about the UZF package, but am unfamiliar with it. Any guidance/ideas/thoughts would be appreciated. Thanks in advance!!
  3. Last week
  4. Hello respected members, The problem mentioned by me in the question above is still unresolved. I tried running MODFLOW model on both 2000 and 2005 version. The problem can also be seen in the example files provided in the Goswami/Clement Experiment** ( I tried changing few things but nothing helped. ANy help in this regard would be really appreciated. Thanks and Regards Saubhagya
  5. Julie, This is kind of a difficult question. It's been a long time since I've worked specifically on DSS files. HEC-DSSVue is the most comprehensive tool out there for viewing and editing DSS files. It seems like there is an import from text file (.csv) function that would allow you to convert several months of data to a DSS file using DSSVue. If there is not, you might have to either copy/paste the data manually as you are doing or write a program using VB or some other programming language to convert the data using one of the heclib DLL's. You can find some limited information about the heclib DLL's by searching on the internet. One version of the heclib DLL's (heclib50.dll) is included with the WMS download. We use the heclib DLL for writing DSS files for HMS models from WMS. I can answer specific questions about programming for the heclib DLL if you are not able to find a solution with HEC-DSSVue. My guess is that HEC-DSSVue should be flexible enough for you do what you need to do however. Chris
  6. SRH-2D only plots the first two points in the graph while it runs and the model developer would like to remove that option to streamline computations. However, the model creates an output file for each monitor point in the folder where the model runs. You can open those at any time and see the values. To get a plot you have to use something like EXCEL. In future versions of SMS there will be an option to view any of the monitor point plots while the monitor runs.
  7. Earlier
  8. I'm having trouble with entering large quantities of data into HEC-HMS while avoiding copy+paste errors. I am currently using HEC-DSSVue, which allows me to enter data for multiple subbasins at a time. Unfortunately, I still have to enter data separately for each month. I was looking in to making my own DSS files, or using a code to go in and directly edit my DSS files, but I'm still having trouble figuring it out. Does anyone have any tips, or their own method for entering a lot of HEC-HMS data at once (without introducing many opportunities for human error)?
  9. Hi Bruce, you may try to make one parameter adjustable (parent) and the rest in the basin tied to the parent. Relevant part from PEST manual: Or, alternatively, you could include the ratio between the pertinent parameters as prior information and adjust its weight accordingly. This way it would still be treated individualy, but the solution would tend to respect the parameter ratios. It is also also possible, that the contribution to total phi for drain observation group is too low, so it is invisible for the inversion proces. You may try to look at it in the case.rec file. It could be resolved by adjusting the weights for the observation groups. There is a nice utility form the PEST suit, that can help to balance this, its called PWTADJ1.
  10. I have 8 monitor points set up in my model all within a monitor points map layer with the coverage type as Model, SRH-2D, Monitor Points. When running, only the first 2 points are visually available in the Water Surface Elevation vs Time graph. Is there a way to see the other 6 points in this graph (or any graph) as well? Thank you.
  11. Hello I used femwater to simulate a transient practical case, and I want to know the water balance of groundwater system in an average condition. I summed up flux of upstream nodes and downstream nodes and averaged them. The water balance error seems to be between 20%~50%. I think it's good enough, but is this method correct? Does a node in transient calculate the flux twice? Thank you!
  12. Hi, Sorry about the problem you're having. Did your model run to completion? I'm not sure exactly what's causing the problem, and I've never heard of somebody with this problem. I'd try moving your HEC-RAS project file so it's not on a network (to a place such as your "C" drive). This might fix the problem. If it does not, I'd recommend contacting Aquaveo Tech support with your files and a description of your problem. Their contact information is here. Let me know if I can help with anything else. Chris
  13. I am at the point where I am able to run steady flow analysis for my HEC-RAC .prj file. However, during the initial stage of post processing, WMS "freezes up" after I select HEC-RAS --> Read Solution. The message "(Not Respoding)" is displayed in upper region of the screen (see attached image). The 2 error messages (attached) also appear. I let this continue for 15-20 minutes before force quitting WMS. Some history: I was originally performing the analyses on my laptop, and was able to get a bit further in the process (i.e., the 2-D scatter point files were created) before WMS "froze" and indicated "not responding". Thus, I added the program to my desktop (Windows 10.1), transferred files, and attempted the analyses once more. On my desktop, when attempting to access my .prj files via "HEC-RAS --> Load Project", I am now given the same error message as above (this did not occur on my laptop). I am able to access open my .prj files, but in a round-about way (i.e., HEC-RAS --> Start --> Open --> select .prj file). I am not sure if this has anything to do with the issue. I created a new .prj file on my desktop, and reran steady flow analysis with the same results. Any thoughts? Thank you.
  14. 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?
  15. Hi Guys, firstly I'm quite new to the program (MODFLOW) and I am looking to develop a model of abandoned coal mine workings to potentially store flood waters within a city. From working through the tutorials it would appear that MODFLOW-USG Connected Linear Network (CLN) is the appropriate technique (but would appreciate clarification on this). Would anyone have any experience with modeling non-darcian flow networks (Eg Karst or man-made voids) who may be able to provide some valuable insight into the process? Thanks in advance M
  16. If it is the case, that there is a bug in gms, so that it does not perform the final model run with the best parameter values stored in the case.bpa you would probably have to move the entire analysis out of GMS. I would suggest you to look at There you will find some guidelines on how to formulate the problem for the NSMC analysis to get the desired results. The usage of parrep utility is prety simple, it is command line utility, so since it is in your environment PATH variable you can run it from CMD: parrep parfile.bpa case_orig.pst case_new.pst The common framework for any NSMC analysis would be to manualy generate random parameter sets with the randpar utility then to project these sets into the solution space using pnulpar. Then runing PEST for each projected parameter set with 1 or 2 optimisation iteration to account for model nonlinearities and colect the best parameter values (.bpa files). Finaly you may run the model with these parameter sets to collect the predictions of interest.
  17. I have a model that was created in Vistas which I'm attempting to convert over to GMS. Note that the original model did not include nested grids, so the node number should be the cell number. Anyways, I have the grid set up and was able to get the recharge in. However, the source/sink files (drn, riv, str, etc.) use nodes. I attempted to drop the information into the MODFLOW files, but I get the error that it wants to look to the HDF5 file for the data. How can I get around that? I put in a test drain, saved the file (the data apparently went to the h5 file)....but when I tried to comment out the reference to the h5 file and attempted to add/read in a couple more drains in the MODFLOW file, the model still pulled in the data from the h5 file. I thought that was a bit odd. Anyways, I have all of these node-based points which I should be able to read in, but can't figure out the best way to do it. Any thoughts?
  18. Hi Jonas. I’ve experienced similar unusual responses when using PEST within GMS, with and without SVD and SVD Assist. Sometimes PEST will reduce my error nicely; other times it gets nowhere. Yet, when it goes nowhere I can manually adjust parameters myself and reduce the error. I’m not sure of the reasons, but it may be related to GMS and it writing the MODFLOW files from pilot points. I’ve had particular problems using kriging interpolation, so much so that I have now switched to IDW interpolation. While I now have less problems, I still experience unusual PEST behaviour. It’s a problem I’ve experience on and off for several years now. I’d be interested to see if others have had any similar problems. My models are with Aquaveo support, but the problem can’t be consistently repeated, so it is difficult to fix. Have you tried importing the optimal parameters from the PEST run into another forward run? Perhaps PEST is writing the new *.par file o.k., but GMS is not updating the screen with the final result (I note GMS’ printing of the *.rec file shows a mixed up version of the actual *.rec file). Try importing the *.par file and running a forward run (saving as a new model name in case something goes weird) then see how the new result looks. Regards, Julian
  19. Hi Tertia, I am not aware of an option to interpolate cross sections with nodestrings. But I am confident there is a way to accomplish what you are trying to do. The most efficient way is dependent on what you currently have. It sounds like you have a scatter set surface right now and cross section data in some format. In what format do you have your cross section data? (XYZ text file, CAD file, Shapefile, etc)
  20. Hello to everybody!! I am using T-PROGS to try to simulate a complicated geological situation within a context of outwash glacial deposit, with silt clay with intercalations of sand lenses. I have some boreholes with information but in some cases distance between wells for a valid correlation are too far (ca 500m) therefore i was advised to use T-PROGS which seems to be perfect for problems of horizontal correlation. main groundwater flow from N to south (Y+ to Y-), distance along the groundwater flow between wells is from 50m to 450m, but i am having some issues: 1- while deciding the lag distances (strike(x) Markov chain) i would like to know what could be useful to put as max lag distance?? because i have no way to see if the values i am using are valid or not, only until the end of the whole flow model of mod flow 2- in the same manner while putting the lag distance of Y (dip (y) Markov chain) can anyone shed some light here PLEASE 3- besides, while creating the grid and the successive T-PROGS for the unconfined aquifers i want to have different materials within the same layer is this possible with the HUF, to avoid dry cells. THANKS A LOT IN ADVANCE FOR YOUR COOPERATION AND REPLIES ALEXANDER
  21. This error comes up if WMS does not have the location of your cross section database or if there are no cross sections or an error reading the database. I'd recommend double-clicking on your cross sections and making sure cross sections geometry is defined for each of your cross section arcs. If there's an arc without any cross section geometry defined or if there's an error loading the cross section database, that's your problem. You might have to re-extract all the cross sections to a new cross section database if some of the cross sections do not have geometry. Hope this helps, Chris
  22. Thanks for your quick reply Michal, I agree on that it seems like PEST is doing its job but GMS does not read in the result properly. But I can't find the reason for this since the same modelling procedure has worked for other models. Quite frustrating. How do use the PARREP utility? Should I use it outside of GMS interface? Kind regards, Jonas
  23. Hello Jonas, from my humble opinion it looks like PEST is doing its job well. It decreases Phi to 63.5% and finish optimisation after one iteration since NOPTMAX is set to 1.Which is probably correct if you try to do NSMC analysis. The reason it does not load solution into GMS may be a GMS glitch. What I think is happening, when PEST is run using svd-assisted inversion it does not carry the final model run using the best parameter values. As is described in the manual to PEST, it is encouraged for the user to do it him/herself using the PARREP utility and setting NOPTMAX to 0 in the PEST control file. So I am guesing that GMS does not do this for you. It would be best if someone from the GMS devs looked into it. Kind Regards Michal
  24. I extracted my drawn-in cross sections from the TIN to create a new cross section database (in prep for HEC RAS). When saving and exiting my .wms file, I was given the following error message (image below). Should I be concerned with this, and if so, how do I address it? Why did this occur? Thank you.
  25. This is what typically happens when running with SVD-assist. As can be seen from the blue marked line, PEST is able to reduce the error to 98.885 from the initial error of 155.76. But, then something goes wrong since this solution never comes up as a iteration before the parameter estimation is finished.
  26. I often experience problems when running a PEST parameter estimation model with SVD-assist. I find it quite arbitrary when it work and when it does not work. For some occasions it seems to work just by moving the modelling files to another computer and run the model on that workstation. For my current model, SVD works but SVD-assist does not. To reach reasonable results with NSMC is even more problematic, in particular for transient models. I run the latest nightly build and NWT as solver. Someone with similar experiences or suggestions to a more streamlined and stable model procedure?
  27. Dear all, I am a recent user of GMS-MODFLOW and one question came into my mind. For the purpose that I am using the software, in most cases the groundwater height in (meters above sea level) is not relevant. It is more important to know the groundwater depth below surface. Is there an option to calculate and visualize this with GMS-MODFLOW? Thanks in advance for the responses.
  28. Why does SMS use both Arc IDs and Arc Names? When you are plotting observation lines you have to know the "Arc Name", but you only have the option of displaying "Arc ID" in the Display Options window. This can lead to confusion when Arc IDs and Names get out of sync when merging coverages. In my current project I have Arc ID 1 through Arc ID 703 and Arc Name 710 through Arc Name 1412. If someone could highlight the advantage of having two ways to reference the same arc, that would be great. Or perhaps the Display Options could be updated to include the Arc Name. Thanks!
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