User's guide of Proceessing Modflow 5.0

Processing Modflow 19
steps 3 to 5 to assign zone numbers 1 to the first and 2 to the second layer.
3. Choose Reset Matrix... from the Value menu, type 1 in the dialog box, then click OK.
4. Press PgDn to move to the second layer.
5. Choose Reset Matrix... from the Value menu, type 2 in the dialog box, then click OK.
6. Choose Leave Editor from the File menu or click the leave editor button .
7. Click OK in the Water Budget dialog box.
100 @ (IN & OUT)
(IN % OUT) / 2
Fig. 2.8 The Water Budget dialog box
PMWIN calculates and saves the flows in the file path\WATERBDG.DAT as shown in Table
3 -1
2.3. The unit of the flows is [L T ]. Flows are calculated for each zone in each layer and each
time step. Flows are considered IN, if they are entering a zone. Flows between subregions are
given in a Flow Matrix. HORIZ. EXCHANGE gives the flow rate horizontally across the
boundary of a zone. EXCHANGE (UPPER) gives the flow rate coming from (IN) or going to
(OUT) to the upper adjacent layer. EXCHANGE (LOWER) gives the flow rate coming from
(IN) or going to (OUT) to the lower adjacent layer. For example, consider EXCHANGE
(LOWER) of ZONE=1 and LAYER=1, the flow rate from the first layer to the second layer is
3
2.587256E-03 m /s. The percent discrepancy in Table 2.3 is calculated by
(2.2)
In this example, the percent discrepanciy of in- and outflows for the model and each zone in
each layer is acceptably small. This means the model equations have been correctly solved.
To calculate the exact flow rates to the well, we repeat the previous procedure for
calculating subregional water budgets. This time we only assign the cell [25, 15, 1] to zone 1,
the cell [25, 15, 2] to zone 2 and the cell [25, 15, 3] to zone 3. All other cells are assigned to
zone 0. The water budget is shown in Table 2.4. The pumping well is extracting 7.7992809E-05
3 3 3
m /s from the first layer, 5.603538E-04 m /s from the second layer and 5.5766129E-04 m /s
from the third layer. Almost all withdrawn water comes from the second stratigraphic unit, as it
2.1 Run a Steady-State Flow Simulation