TUFLOW Message 1331
TUFLOW Message 
ERROR 1331 - Unrecognised flag for channel
Alternate Message 
NA
Message Type 
ERROR
Description 
Flag for channel is unrecognised or invalid for channel type.  Vaild flags are:
A - Adjust Stucture Losses
D - Downstream Controlled
F - Fix Sturucture Losses
N - Non-inertial Channel
U - Uni-direction
V - Variable Geometry
W - Weir over the top
Flags can be added after channel type, for example to set a culvert as uni-directional (such a a tide gated culvert) a "CU" type channel is assigned.
For a detailed description of channel flags, refer to the TUFLOW Manual.
Suggestions 
Remove invalid flags / specify correct flag.
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