User's guide of Proceessing Modflow 5.0

Processing Modflow 223
in this case it is T1SS.DAT and click OK.
5. Exit the Load Matrix dialog box by clicking on OK.
6. The data will appear in the Browse Matrix dialog box, click on OK to exit this dialog box.
The data is now loaded.
7. Leave the Data Editor by File < Leave Editor < Yes
Time Paramters
We now need to change from a steady state simulation to a transient simulation. In the transient
simulation there are two stress periods, one of 240 days when pumping is occurring and no
recharge and the other of 120 days when there is recharge only. It is possible to have different
conditions for each stress period as will be demonstrated below.
< To change to a transient simulation
1. Select Parameters < Time... to open the Time Parameters dialog box.
2. Change the model to transient by clicking on Transient in the Simulation Flow Type box.
3. Activate the second period by checking the Active box in the second row of the table.
4. Change the period length and time steps such that
For period 1: Period Length = 240; Time Step = 12
For period 2: Period Length = 120; Time Step = 6
5. Click OK to exit the Time Parameters dialog box.
Pumping rates
Now we need to set the pumping rate for each well during stress period 1.
< To set the pumping rate
1. Select Models < MODFLOW < Well
2. At each of the wells (marked by a little shaded box on the DXF Map) click the left mouse
button to select the cell and then the right mouse button to set the pumping rate to -3888 in
the Cell Value dialog box. This pumping rate is equivalent to 45 l/s, the negative sign
means that water is being extracted from the system being modelled. A recharge well would
have a positive sign.
3. Exit the Data Editor by File < Leave Editor
Upon leaving you are presented with a Temporal Data dialog box, this allows you to select
and edit the data so that different values can apply during different Stress Periods.
4. Select Period 2 and click on Edit Data. The status bar displays Period 2 indicating that you
6.1.1 Tutorial 1 - Unconfined Aquifer System with Recharge