I tried to create a Modflow model from Solid layers using Aquaveo GMS 10.4 but I got an error like the attached figure.

Do you have the experience to solve this error? Please help me!

Thank you very much,

Yours sincerely,

T.An,

]]>1. We definitely need to be able to look at a cross-section of the dam and show head contours on the cross-section. With a regular grid, this is straight forward as long as your cross-section is along a row or column. I don't see any cross-section cutter in the USG model. With an unstructured mesh, we are used to using the control key to select a line of elements to isolate. I do not see that that hotkey is available with an unstructured grid, but it looks like we can select and isolate a group of cells and get a similar effect - either draw a box or select with a polygon. Is that our best bet?

2. Once we have the model solution, we compute a factor of safety against uplift at all the surface nodes in the FEM model - basically we need the gradient for upward flow. We have an external code that will automatically do this for an unstructured mesh by comparing heads and elevations at nodes located at the same x,y location. If we use a regular structured gridded MODFLOW, the computation is pretty trivial using the MODFLOW arrays for the centroid elevations and computed heads and the data calculator. I am not finding the same options in the unstructured grid. I realize that the grid is not required to have layers and that the computational points are not necessarily at exactly the same x,y locations, but it seems that the only way to build the unstructured grid in GMS is with layers, so if you're using the GMS interface, it's likely a layered USG. At this point, I'm thinking writing an external code or maybe an excel macro may be my only option here and I can probably steal code from the routine we use on unstructured meshes. Is there anything I'm missing in the GMS interface that could help me here?

Thanks for your advice.

]]>I am trying to model a support of excavation (SOE) with diaphragm walls along the perimeter of the site and install wells for dewatering within the site. We would like to see the drawdown curves inside and outside the site. Can anyone please give me a direction on this? We don't have a toe cut-off.

Thanks

]]>I am trying to use GMS to model a dewatering system within in excavation which has cut-off walls on all the sides. I am very new to this software.

Can anyone direct me to the right track here?

Thanks a lot!

]]>I tried to construct a Modflow model from solid data using hydrogeological boreholes data.

Unfortunately, I got an error like the attached figure. Could anyone have any solutions please help me.

Thank you very much,

Sakura,

]]>

I'm currently using the Conceptual Model Approach to assign General Head Values to my Modflow-Model. I have two main aquifers, separated by a confining unit and I want to assign different head values for each. Since my grid expands over about 500 cells in vertical direction every aquifer extends over several grid layers, but height is not consistent over the whole domain.

Is there any approach like assigning head values to materials?

Thank you a lot, Jonathan

]]>I am trying to perform Monte-Carlo simulation in a vertical slice of the aquifer (x-z plane). I want to generate around 100 realizations of the spatially-correlated hydraulic-conductivity random field in 2D (x-z plane). Then I want to solve flow and transport for each realization and analyze the ensemble of results. I explored options in GMS and this is what I found out (correct me if I am wrong):

1) Stochastic Modeling Option: It is not possible to generate 2D field (spatially varying K values) using this option.

2) Interpolation using 2D Scatter Point Tool: This only allows to generate conditional realizations (kriging). I couldn't see a way to generate unconditional realizations. Also, this tool works only in plane view, hence random field can be generated only in the x-y plane. I want to generate fields in x-z plane.

Hence, it seems my only option is to generate K fields outside of GMS, importing K fields and solving cases one by one. Please, let me know if there is any other efficient way to perform this.

Thank You

Saubhagya

]]>When I want to map my conceptual model on UGrid (Unstructured Grid) , it works till 6% and then it shows the following error:

**"Boost. Geometry overlay invalid input exception"**

I stuck in this step and I need your precious help. Any points would be highly appreciated.

Many thanks in advance for your time and help.

]]>I have a working Modflow-NWT steady state model. However, it does not trace capture zones using modpath.

Error message states as: " RUN STOPPED because cell thickness is negative"

Does modpath work with Modflow-NWT?

Any help is appreciated.

Thank you,

Lalith

]]>

Ted

*I'm asking this question on behalf of a client - they are upgrading their GMS license to 10.4 (I believe that's the version - waiting for confirmation) with a single-user USB dongle. During the installation process of GMS, the installer asks for a ArcGIS license. They don't have one. What circumstances would require a license to ArcGIS? Is there a work around?*

Thanks

Ted

]]>I’ve prepared boreholes, cross section and stratigraphy solids using GMS Version 10.4.

I created first 2D Quadtree UGrid and then I selected Horizons -> UGrid from Borehole menu to map Horizons (Solids) to the 3D UGrid (Quadtree). I faced the following error and I cannot figure out how I can solve the problem:

**“No dataset defined for scatter set Horizons. Cannot continue”**

Your prompt help and response would be highly appreciated.

]]>I encountered a problem when I was trying to download Online Maps because the "Advanced button" is missed from "Get Online Maps" dialoge.

I am using GMS 10.4.2.

Any suggestions please.

]]>

I'm modeling a contaminant transport with MT3D while activating MNW2 package for multi-layered model. It seems MNW2 package gives appropriate value for head and drawdown. But when I check the concentration after running MT3D, it gives erratic value on multi-nodes well location.

I put negative pumping rate on mnw to simulate pumping well and the concentration is exceeding the upper limit of modeling domain.

I wonder anybody experienced same (or similar) problems? If so, any suggestion would be appreciated.

Thanks,

Ki

]]>I know I can export XY data from Top and Bottom elevation of a MODFLOW Model, but I can only get Hydraulic conductivity with cell I,J,K reference not XY.

]]>Could anyone help m regarding this issue? I set up a model in MODFLOW to understand the lake-aquifer interaction. Now I am trying to incorporate the LAK3 package there. I followed the Aquaveo Lake package tutorial and did everything accordingly. However, whenever I am mapping it to MODFLOW all the layer elevations are changing. Here I have attached two pictures about how my model was looking previously and how it changed after using the lake package.

Thanks

Bidisha

]]>I can get all of the water level residuals in the PEST output, however, PEST renames the observation points and seems to jumble them up. I'm working with about 20,000 water levels in this case. I've tried sorting and data base queries but there are many duplicate water levels and this hasn't worked.

Any ideas would be appreciated.

]]>I am a long -time user of GMS and I am testing GMS v. 10.4.1. now. It seems to me that in GMS v. 10.4 raster/image layers (tif, jpg) in GIS layers are not visible or displayed correctly (despite from the project and layer projection settings), even in projects, created and correctly displayed in GMS v. 10.3. Has anybody experienced the same issue?

Thanks for any reply.

Zbynek

]]>I heard from another user that this is a potential bug. Has anyone experienced this?

]]>

Date | gals) | (gpm) | (ft3/day) |

3/12/12 | 0.0 | 0.0 | 0.0 |

3/15/12 | 5,212.0 | 1.2 | -232.3 |

3/16/12 | 8,674.0 | 2.4 | -462.8 |

3/19/12 | 9,752.0 | 0.2 | -48.0 |