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Found 4 results

  1. Hi there, I'm having a problem related with assigning specified flow boundary conditions to my UGrid / Modflow-USG model. The error appears when I do the '' Map to MODFLOW'' option while converting my conceptual model to UGrid numerical model. I have read the helping document saying that If you want to use ''Specified flow boundary condition'' the UGrid must be a stacked grid. A stacked grid is one in which there is no vertical discritization of layers and the horizontal discritization of all layers is the same. (i.e. the Index of Vertical Sub-Discretization (IVSD) in the UnStructured Grid Discretization (DISU) package could be set to -1) (See the Figure attached). Firstly, I did not understand what this means and how to find the IVSD in the DISU package and set it to -1 to be able to use specified flow boundary condition. In my model there are 2 groundwater divide boundaries which must be zero flow and 2 formation boundaries where the aquifer feeds from neighboring formations with a specified flow value. If I ll have to change my specified flow bound. cond. with something else or If there is a way to use them, could you please help me to find the solution? Thank You!
  2. Hi, I am trying to get GMS to calibrate a specified flow boundary that I assigned to my model. The boundary was created by using a coverage polygon. However, when I try to initialize the boundary to PEST, I can't get PEST to recognize the specified flow boundary. Does GMS support PEST calibration of specified flow boundaries? Is there a step that I'm missing? -Josue
  3. Use of Specified flow=0

    Hi, If I use the auto-assign function for implementation a "Specified flow = 0 " to cells (for example along an arc) it appears like a "Well condition" in GMS. Is it the way that Modlfow deals with this boundary condition or it is a implementation of GMS ? Can you precise this ?
  4. Hello Everyone, I have a doubt in specifying no-flow boundary condition, Should it be done with making specified flow 0 , or should it be by horizontal barrier? Any help will be appreciated, Thanks in advance Saubhagya
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