Initial water level of object relative to model datum (m).
Float
Read MID IWL Command
N
Row of cell.
Integer
M
Column of cell.
Integer
IWL
Initial water level at cell relative to model datum (m).
Float
3.16.21D Domains
Similarly for 1D domains, initial water levels (IWL) are set globally as a constant using Set IWL. IWLs can also vary spatially using one or more GIS layers. This is particularly useful for setting initial water levels in lakes, dams, etc. The default initial water level at 1D nodes is zero (0).
Note: The restart file feature is only available for 2D/1D models; it has yet to be implemented for 1D only models.
To set up a GIS IWL layer for the 1D domains:
Create a 1d_iwl layer using an empty layer created by Write Empty MI Files.
Digitise points snapped to nodes and assign each point an initial water level value.
Export the GIS layer as a MIF/MID.
Use the Read MI IWL command to read in the IWL values.
Any number of IWL layers may be used, noting that if a node’s IWL occurs more than once, the last occurrence prevails, ie. TUFLOW or ESTRY overwrites any previous IWL already set.
At Build 2003 04 AA the initial water levels at nodes connected to a 2D SX link are set to the initial water levels of the 2D SX cells.
Table 4.20 1D Initial Water Level (1d_iwl) Attributes
GIS Attribute
Description
Type
Read MI IWL Command
IWL
Initial water level of object relative to model datum (m).
