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Lalith

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About Lalith

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  1. Curve Number

    Hi, I am trying to calculate curve number for a watershed using soil type and land use data. I am required to use watershed boundary, longest flowpath and drainage point shapefiles from another program. I also have GIS shapefile of soil type and land use. First I made the drainage coverage and projected watershed boundaries, longest flowpath and drainage point shapefiles. created the polygons and calculated basin data. Then I tried to calculate the CN using soil and landuse shapefiles. I used a land use table created by me using the soil and land use data. Please see the attached document for more details. However, my CN calculation provide me an empty output with the following message on it. Would you please help me figure this out. ================================================================================ Runoff Curve Number Report (Generated by WMS) ================================================================================ Fri Oct 20 13:43:33 2017 Thank you, Lalith
  2. CAD, layers and cross sections

    Hi, I have an inherited a GMS modflow model where properties of soils are defined as layers (not as solids). Each layer has several different zones (areas) with different soil characteristics, such as hydraulic conductivity. My client need few different types of outputs. Would you please let me know if they are possible? The required outputs are as follows. 1. Cross section (other than front and side views) showing layers only (not all model grids) and preferably color each zone of different soil types within each layer with different colors. 2. Can the output in 1 be exported to AutoCAD or ArcGIS in 3D? 3. Can the capture zone of each layer due to extraction well be separately output as shapefiles or AutoCAD in 3D? 4. Can the layer elevations be shown in front and side views? Thank you very much and I appreciate your responses and suggestions. Lalith
  3. Infiltration Gallery

    Hi, I have a GMS modflow model. I need to see how effective an infiltration gallery in this modeling domain. If you have modeled infiltration filters using GMS, would you please direct/help me on how to do that? Directing me to any study resources are also appreciated. Do we have any tutorial that would explain this? Thank you, Lalith
  4. MODPATH crashes

    This happened to me as well. My understanding is that this takes up lots of RAM if you create a large number of particles. I would start with total of 20 or 30 particles for entire simulation and increase gradually. That worked for me.
  5. mapping solids to a 3D grid

    Hi, I have built 3D solids using borehole data of quite complex geology. It has so many layers of soil types. However, I do not feel that I should assign layers for each soil type because it will make too many layers to analyze. Should I?. Also, some soil layers do not run across the entire domain. I was thinking these solids should be mapped to a 3D grid with three or four layers with similar hydrogeological characteristics. Can someone please guide me how I should map these data to a 3D grid modflow grid with few layers? Am I going in the proper direction in modeling this? Thank you, Lalith
  6. Hi, I have a multilayer (9 layers) GMS modflow model. I need to select cells within a rectangle area in only three layers (say layers 3,4, and 5) to run modpath and provide these loacations as starting locations for forward particle tracking. Would you please let me know how to do this? I also noticed that, selecting all the cells within the rectangle area also selects lots of cells and running forward tracking hangs the computer. Therefore, I made set of points spaced apart farther than cell dimensions so I can use the option "intersecting objects". Can I select intersecting cells of these points within the rectangle and within only 3 layers? Please let me know. I appreciate your help. Lalith
  7. Thank you Allen. I will update you if I come across any issues.
  8. right click on grid, click view values and chose export. This will give you an text file like this. Now you can filter data for desired I, j or k. , "id", "k", "i", "j", "f", "Active" 153977, 153977, 3, 80, 13, -999.0, 0 153978, 153978, 3, 80, 14, -999.0, 0 153979, 153979, 3, 80, 15, -999.0, 0 153980, 153980, 3, 80, 16, -999.0, 0 153981, 153981, 3, 80, 17, -999.0, 0 153982, 153982, 3, 80, 18, -999.0, 0 153983, 153983, 3, 80, 19, 3.74, 1 153984, 153984, 3, 80, 20, 3.74, 1 153985, 153985, 3, 80, 21, 3.922809, 1 153986, 153986, 3, 80, 22, 4.011435, 1 153987, 153987, 3, 80, 23, 4.02681, 1 153988, 153988, 3, 80, 24, 4.012944, 1 153989, 153989, 3, 80, 25, 4.009489, 1 153990, 153990, 3, 80, 26, 4.031189, 1
  9. Hi, I am trying to set up a groundwater model. I have DEM data that covers a large area (these are less accurate). In addition, I have more accurate measured ground surface elevation data (in X, Y and Z form) at several locations of interest given the discharge and pumping activities at these locations. There are observed ground water elevations at these locations which are expected to be used in model calibration. I first used DEM data to establish ground elevation in the entire model domain and then imported the observed data at these locations of interest and interpolated in 2D. Problem is that ground surface elevations in entire modeling area changes when I load observed local data as 2D data set and interpolated. Since there are no observed data in the regions among observed data, ground elevation drastically changes to unrealistic values in the areas where there is no observation data. Simply, model remove elevations calculated from DEM and recalculate elevations based only using observed data. Please let me know how I can first use DEM data to generate ground surface elevations in my entire model and revise ground elevations only locally using measured data without changing ground elevations in the entire domain. Thank you, Lalith
  10. Particles from a selected well

    Thank you Sean
  11. Mapping Material Properties in GMS

    Thank you Allen.
  12. Particles from a selected well

    Hi Sean, Thank you for your prompt response. I selected the cell and check the available option but it does not show the option to select the well within the selected cell. However, it allows me to release particles from the entire selected cell. However, my problem is bit complicated. I have a model with 6 layers and the screening level of the well starts from the middle of the 2nd layer and continue till midway of the third layer. I want to release particles only from the screened levels in order to recognize the capture zone.
  13. Mapping Material Properties in GMS

    I also had the same issue but I found a way around by making coverages with Areal properties "Horizontal K" and "Vertical anis." for each layer and assigning "default layer range" x to x where x is the layer number. However, Michel's method seems to be the proper way. Hi Micheal, Would you please be more specific on how to set "Layer property entry method" as "Use material IDs"? Thank you, Lalith
  14. Particles from a selected well

    Hi, I need to run modpath from a selected well out of many wells in my GMS project. Is this possible? According to xmswiki, I see such option is available in GMS (http://xmswiki.com/wiki/GMS:MODPATH_Particle_Tracking). Please see the option marked in red below. --------------------------------------- Generate Particles at Wells – Accessed in the MODPATH menu. This command automatically generates particle starting locations in cells containing wells. The specified number of particle starting locations are distributed evenly in a horizontal circle around the center of the cells containing the wells. Specify the number of starting locations per cell, and whether the user wants starting locations created in extraction well cells, or injection well cells. Injection Wells – If this option is selected, particles are created in cells with wells that have a positive flow rate. The tracking direction for the current particle set is changed to forward. Extraction Wells – If this option is selected, particles are created in cells with wells that have a negative flow rate. The tracking direction for the current particle set is changed to backward. Selected Wells – This option makes it possible to generate particles at either all wells or only at wells within selected cells. ---------------------------------------- However, I see only first two option in GMS. I have the most recent version GMS with all up-to-date.Am I missing something here? I appreciate your response. Thank you, Lalith
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