I have the following problem:
Two rivers, A and B, run parallel some hundred meters apart. The water in the two rivers both flow in the same direction. A canal, perpendicular to the rivers, connect them. Flow direction in the canal is defined to be from A to B, (based on how I drew the system on the schematic).
Actual flow in the canal may be from river A to B, or from B to A, depending on the flow / water level in the two rivers.
However, it seems that HEC is only able to calculate flow in one direction in the canal. When flow is from A to B, everything is OK, also flow split optimization works.
When flow in the canal is from B to A, the flow split optimization does not find a solution. When I do the flow split manually, by defining a negative flow in the canal (from B to A), HEC sets the canal flow to zero.
Questions
Is there an easy way to change the definition of the flow direction of a river reach.
Does HEC handle negative flow (flow in opposite direction) for steady flow calculations