A well pumping rate can be used to calibrate a MODFLOW model. This requires create well with actual pumping rate (negative for extraction). To calibrate an existing MODFLOW model using the well pumping rate, use the following steps:
| 1. Define MODFLOW parameters.
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- Define the MODFLOW parameters using the well and the pumping rate assigned to the well.
- Select MODFLOW | Parameters to open the Parameters dialog.
- Click the New button.
- Turn on Show all columns checkbox.
- Change the Type column to "WELL".
- In the Key column, enter actual pumping rate.
- Enter inverse of pumping rate value in the Value column.
- Enter Min and Max values greater than 0. These and “Value” will be multiplied by the Q factor later which will be negative 1, so positive values here will actually be negative.
- Turn on Log Xform
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| 2. Define well options.
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- Select MODFLOW | Optional Packages | WEL - Well' to open the MODFLOW Well Package dialog.
- For the Q factor column, enter "-1.0".
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| 3. Set calibration parameters.
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- Select MODFLOW | Global Options to open the MODFLOW Global/Basic Package dialog.
- Change the Run options to Parameter Estimation.
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