TUFLOW Message 2118

TUFLOW Message
CHECK 2118 - Lowered SX ZC Zpt by <change in 2C cell elevation in metres>m to 1D node bed level.

Alternate Message
NA

Message Type
CHECK

Description
Lowered SX ZC Zpt to 1D node bed level. This message only appears in the _message.mif file and is associated with a special 2D cell style (wjs - in the description from the access database, there was a ??? here, was this on purpose).

A "Z" flag has been used ato adjust the ZC elevation at each cell at/along the 2D SX object to below the 1D node bed elevation where ZC is higher. The ZC elevation is set to the Cell Wet/Dry Depth below the 1D node bed. It is not recommended to use the Z flag without first checking that the reason for the discrepancy in elevations between 1D and 2D domains is appropriate.

The "Z" flag lowers only the cell centre (ZC) and if used inappropriately can result in stability issues if there is a discrepancy between 1D node and surrounding 2D elevations.

Suggestions
Check elevation at 1D node and 2D cells, if a large discrepancy exists, review levels. For example a 1D pit with an elevation (from survey) maybe significantly below the elevation in the DEM. Using a SX connection with a Z flag will lower the cell centre to below the 1D level, but will not lower a flow-path into pit and may cause stability issues.

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