TUFLOW Message 1042
TUFLOW Message 
ERROR 1042 - Could not find a culvert invert downstream of culvert ",a,".  Downstream invert not interpolated.
Alternate Message 
ERROR 1042 - Could not find a culvert invert upstream of culvert ",a,".  Upstream invert not interpolated.
Message Type 
ERROR
Description 
No upstream / downstream invert specified, TUFLOW is unable to interpolate an invert.
Suggestions 
Specify inverts upstream and downstream of the culvert, either via the US_invert / DS_invert in the 1D channel object or via snapped 1D node objects.
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