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Did you ever get this sorted out? I had this problem with one of my models and ended up increasing the thickness of the top layer so that the heads (at their...
Hi everyone. I am working on a model attempting to simulate lakes in karst terrain. There are a series of lakes perched on a sandy ridge. Originally the lakes...
I don't know if MODFLOW actually has a way of designating a lake - in say the same way as a river - but it could do, and its availability would depend on...
Dear Colleague, As you know for areas where bounaries play an important role in recharging or discharging the model domain, defining the appropriate...
Hi Ashley, It seems, in terms of mass balance, that the constant heads that were representing your lake were providing a significant inflow to the model. When ...
Hello Ashley, You've had couple good replies to your question. Here's more to think about. Are the lakes really perched? That implies a poor connection to a...
If the lake stage is controlled by factors other than ground-water flow into or out of the lake, then simulating it with a constant head boundary is...
Richard B. Winston
rbwinston@...
Feb 18, 2009 3:19 am
2965
I will be happy to answer any questions that you have. douglas Douglas Graham Senior Engineer DSP DHI, Denmark From: gwmodel@yahoogroups.com...
My name is John R. Hamilton, P.E., I am a Civil Engineer and the author and programmer of Flow Calc. I recently developed Flow Calc in direct response to a...
Call For papers International Journal of Environmental Engineering Science (IJEES) Special issue on: “Environmental modeling and analysis” Guest Editors: ...
Dear listmembers, I wonder if somebody has come accross a formula or method to estimate the true head in a partially penetrating pumping/injection well in...
In a quasi-3D model, the confining units are not represented by model layers. Instead, the vertical conductance between the aquifers is set to a low value to...
Richard B. Winston
rbwinston@...
Mar 6, 2009 3:51 am
2971
Quasi-2D models and quasi-3D models are properly defined to classify analytical solutions for groundwater flow in layered aquifer systems. Modflow borrowed the...
Kick Hemker
hemker@...
Mar 7, 2009 8:41 am
2972
Ashley: Quasi-3D usually means that the model represents leaky, confining layers with purely vertical (1D) flow connections between the aquifer layers ...
Schreiber, Robert
SchreiberRP@...
Mar 7, 2009 8:41 am
2973
Dear colleagues, I am starting to build a 2D horizontal modelling of a coastal aquifer, which is of porous type and unconfined. Although it is a question of...
FAKIR Younes
fakir_younes@...
Mar 16, 2009 2:22 pm
2974
If your purpose is to study saltwater intrusion, as a first assumption I wouldn’t consider using a 2D horizontal model: the presence of a saltwater wedge...
Hello, Visual MODFLOW, developed by SWS, is a 3D groundwater flow and solute transport modeling application that has implemented the USGS SEAWAT module. SEAWAT...
Hello everyone, I m quite new to modflow,using GMS. My question is about river observations; I have river in my model which is passing from east to west....
As far as I understand, you don't actually model river flow using MODFLOW, you have to model river stage. If you know the channel dimensions you'll be able to...
That’s right: MODFLOW ignores the river flow. To simulate a river you have to measure (or derive from maps), among other data, its stage at different ...
Thanks for the informations, But the observed flow should be 20 l/s,not 120 or 100. Best Regards ... From: Giovanni Formentin <piercoop@...> Subject: R:...
Yes: 20 l/s should be the flow supplied by the aquifer to the river (if the river flows east to west) as calculated by the model through the whole river...
Actually there are alternatives. Here's one: If you use the RIV package, probably the single 20 l/s is appropriate. If you use the STR package, you might use...
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