Modflow-NWT, groundwater modelling

[Maggie Binks]

I have developed a programme in Modflow-NWT with Modelmuse to test different rain and soil scenarios. Now I have the problem that in the scenario where it is not supposed to rain for 6 days, a huge amount of water is absorbed into the ground and I don't know where exactly it comes from. Can anybody take a look at my programme code?

[Richard Winston]

The first thing to do would be to look at the overall budget and see which package is supplying the water. 

On Thu, Jul 17, 2025, 5:47 AM Maggie Binks <nelli...@gmail.com> wrote:

I have developed a programme in Modflow-NWT with Modelmuse to test different rain and soil scenarios. Now I have the problem that in the scenario where it is not supposed to rain for 6 days, a huge amount of water is absorbed into the ground and I don't know where exactly it comes from. Can anybody take a look at my programme code?

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[Maggie Binks]

I'm sorry, I don't know the programme that well yet. What is the best way to do this?

[Richard Winston]

The listing file is the main output file from MODFLOW. It is a text file. Open it in a text editor and find the section that describes the budget.

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[Randall Hanson]

Also keep in mind that MF-OWHM has the additional advanced feature of a separate output file of just the water budget components called VolBudget.txt, that makes this kind of analysis much simpler and straightforward. 

So you may want to switch to using MF-OWHM with its other advanced NWT features too. 

Cheers,

Randy Hanson

One-Water Hydrologic

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[Dr. Obasi Arisi Ikenna]

Hi everyone,

I carried out a regional groundwater model setup using MODFLOW-OWHM 2.3 and ModelMuse successfully. I wanted to equally do automatic model calibration in a steady state using the PEST_18. After activating PEST, setting the parameters, and running the model again, a PEST CHECK confirmed that there was no encountered.  However, each time that I tried to RUN PEST, my model will run only two steps and truncate to display the recording run Statistics, without writing the record file .rec and the associated files. If I want to proceed to further analysis by importing the PEST result, the software will tell me ERROR, and ask me to look at the .lst. When I opened the .lst file, I saw the error code: ERROR READING ARRAY CONTROL RECORD FOR TOP ELEVATION OF LAYER 1:

   SURFACE. 

Please is there  any idea on what I can do to  fix this and successfully display my calibration results?

Thanks.

Ikenna Arisi Obasi, 

+2348035385872

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