EGATIVE AREA IN SUBROUTINE CONVEY
BETWEEN STATION 0.00 AND 164.04
1 5 45
THIS IS USUALLY CAUSED BY BAD STATION/ELEVATION DATA
IF THIS NODE HAS A WEIR (BRIDGE etc.) CHECK THE ROAD DECK DATA CAREFULLY
NEGATIVE AREA IN SUBROUTINE CONVEY
I have tried everything but I can not fix the problem. (I have a long culvert with 2m drop in between which I used cross section with lid to model it). I have imported my geometry data from 12d
I have changed the time steps. cross section spacing. number of iteration and ... but the model is not working.
I've found a way to solve the same problem you encountered (1D only) : it seems be caused by the Multiple Opening Analysis conditions.
For multiple opening bridges (bridge + culvert), ONE ONLY AREA has to be set as "Conveyance". This "Conveyance" also must be on the extreme Right or Left overbank...
Be careful to set this "Conveyance" only outside of areas where the bridge can overflow (like a weir). I solved some case in putting this "conveyance" to the far right / left of the structure (a few meters is enough).