Groundwater Simulation and Well Simulation

[Hafids Galant A]

Hello everyone

I created a regional model to simulate groundwater level decreases during mining, but when I added a pumping simulation, there was no cone of depression visible in the simulation, even though in the field the groundwater level decrease ranges from 10 to 15 meters. I have tried two pumping conditions—steady state and transient—over a 365-day period. The simulation results in the plane view show that the groundwater level does drop, but the results do not match the field data.
I am running the model using ModFlow NWT with Visual ModFlow Flex 9

My question:
Should the model scale be reduced to focus only on the mining pit area?
Or should I stick with a regional model and adjust certain parameters?

I would be very grateful to anyone who responds so that I can discuss this and gain a new perspective.

Sincerely,

Hafids

Translated with DeepL.com (free version)

[Jakab Andras - Gmail]

Your drawdown should not depend on the size of your model domain. It is much more likely that your boundary conditions and/or properties are inadequate. As a first effort to find the cause of the problem, look at the water balance at the end of the .LST file and try to decide where does the water that leaves the model domain through your wells does come from. It would probably help if you run the model with and without the pumping wells activated and compare the water balances.. 

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This group was created in 2004 by Mr. C. P. Kumar, Former Scientist 'G', National Institute of Hydrology, Roorkee. Please visit his webpage at https://www.angelfire.com/nh/cpkumar/
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