MODFLOW-2000 GWT Data Requirements
Date requirements for visualizing MODFLOW-2000 GWT results are as follows:
- The input parameter
CNOFLO
must be assigned a value that is different
from simulated concentration at active cells. (See note 1 below.)
- Simulated concentrations must be saved to file at the end of one or more "particle moves".
The concentration file may be formatted or unformatted. (See note 2 below.)
For a formatted file, the input parameter
ICONFM
should be greater than or equal to zero.
- To view velocity vectors, velocity must be saved to file.
The velocity file may be be formatted or unformatted. (See note 2 below.)
The input parameter
NPNTVL
should be assigned a value that depends on the input parameter
NPNTCL
according to the following table:
If NPNTCL is |
Then set NPNTVL to |
-2 |
-1 |
-1 |
1 |
0 |
0 |
greater than 0 |
1 |
- To view particle, particle locations must be saved to file.
The particle location file may be be formatted or unformatted. (See note 2 below.)
The input parameter
NPNTPL
should be assigned the same value as the input parameter
NPNTCL.
Notes:
- If the simulated concentration at a cell is equal to
CNOFLO, Model Viewer assumes that the cell is inactive and will not display it.
Therefore, the common practice of setting CNOFLO to zero should be avoided
if concentrations at active cells might also be zero. Another
consideration is to avoid truncation error. For example, setting CNOFLO
to 99.999 should be avoided because the output might not be written with
adequate precision. Instead, it is recommended that CNOFLO be set
to a large negative integer such as -1.0E10.
- Model Viewer reads unformatted files much more quickly than formatted files.
Therefore, for a faster animation, the concentration file (and velocity and particle location files, if saved)
should be unformatted.