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Found 6 results

  1. 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!
  2. Hello, I am struggling with exporting the river coverage to shapefile - mainly I want to export the nodes with its ID and the head stages to shapefile I do it in standard way: Export Coverage - and choosing the .shp extension. Then I can export arcs and point file (polygon no as my coverage doesnt contain any polygons). The shp with arcs is exported without any problem, but what I am mainly interested is the shapefile with points. That is created but it doesn' t contain any data. (it contains just the names of attributes, but under that novalue). Is there any problem? According to gms wiki, should be possible to export head stages of rivers. My aim is to export GMS ID of nodes of the coverage (to have the information of X, Y coordinate and GMS ID), so I thought exporting to shapefile would be the easiest way. Is there any other possibility how to export ID of the Nodes with its XY coordinates from coverage to some format that can be then easilly processed (e.g excel,?) Thank you for any advice (I am using GMS 10.1.05) Petra
  3. A question on GMS coverages for MT3D: Can a coverage be created for parameters in the MT3D Chemical Reaction Package? For example, I would like to set up zones within a model with different sorption coefficients and first-order reaction constants. It does not seem like these options are available when setting up a coverage - am I missing something? Or, is this only something that can be done in Grid Mode. Thanks, Rich
  4. I'm a newer user building a MODFLOW model that I will then need to teach others how the model was constructed, I am establishing a coverage for the WEL package that will use a point shapefile from another model to inform the location and pumping/abstraction rates. One of the attributes in the shapefile is "Layer", identifying the layer of the well in the 10 layers of the model. I was shown how to create the coverage but I wanted to understand the rationale for selecting the Layer Range item in the Source/Sink/BCs list. I'm guessing this allows the use of the Layer attribute to map the points to specific layers in the Solid and Grid models, assuming they appear within layers 1 to 10, as specified. Also, I had a question about the "Use to define model boundary (active area)" check box. I have conflicting information as to when that should be checked in a coverage. My intuition tells me that is would only apply to feature objects that define the model boundary and not necessarily other boundary conditions that are applied to the model boundary conditions. For example, given one coverage (a polygon) that defines the extent of the active region of the model across all layers is create with the "Use to define..." item checked. If separate coverage was created that defines a constant head on layers along one edge of the active model domain, already identified as active in the other coverage, does the box need to be checked? When should it be check and not? Is there a danger in checking the box when it shouldn't. Any insights are appreciated Ted
  5. I've create a multi layer Modflow model (2 layers). I've a coverage (coverage 1) defining the domain. The coverage is divided in two polygons ( polygon A e B ) for setting the HK: a. HK_a, for polygon A, layer 1 to 2 b. HK_b, for a polygon B, only layer 1 c. HK_c, for the same polygon B, only layer 2 I duplicate coverage 1, coverage 1.1 e coverate 1.2. I make these assignments: -coverage 1.1 to layer 1 -coverage 1.1 to layer 2. Is it correct or there is a different approach? Thank you Daniele
  6. Hi, how do I export points from an observation coverage as a Shapefile without losing the attributes observed value and computed value? In essence, I want to export, preferably as a Shapefile, what is shown in the attached screenshot. When I save the coverage as a shapefile, the shapefile doesn't contain the attributes for the observed and computed values. Thanks for any tips and advice on this. Regards, Felix