RAS Steady Flow Computation Procedure

[OMoyles]

To address the figure which is my question…
For HEC-RAS to compute a subcritical flow profile, it takes a downstream boundary condition(eg. mild reach backwater into pond). For HEC-RAS to compute a supercritical flow profile, it takes an upstream boundary condition (eg. steep reach drawdown from pond).

All well and good.

BUT

What if there is a hydraulic jump exiting the upper pond, and a hydraulic jump entering the lower pond? How would HEC-RAS find a place to start computing water surface elevations?
How should the modeller approach this situation?

Thank-you,

Oscar M

[Ian Sharp]

I would have a hard time believing a jump would occur as the flow exited the upper pond and entered a steeper reach. It seems the jump would occur as it entered the upper pond.

[Author]

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