TUFLOW Message 1466

TUFLOW Message
ERROR 1466 - Upper Transition Elevation is lower than Lower Transition Elevation for an Arch Bridge channel.

Alternate Message
NA

Message Type
ERROR

Description
For arch bridge channels (BArch), the start of the orifice flow transition needs to be lower than the end of the orifice transition. That is, the arch bridge channel will transition from using the arch bridge approach into orifice flow as the water level approaches the bridge obvert if the orifice flow flag (1d_nwk attribute 'HConF_or_WC') is turned on (the default is turned off). For more information, refer to Table 5.12 of the TUFLOW Manual.

Suggestions
The lower transition elevation cannot be higher than the upper transition elevation for BArch channels.
For arch bridges modelled as 1D channels, the 1d_nwk attributes 'EntryC_or_WSa' = Lower transition (measured as depth below obvert) and 'ExitC_or_WSb' = Upper transition (measured as depth above obvert). If using the arch bridge editor in QGIS, the transition values can be found on the 'General Data' tab.

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