Reverse pump

[CCMagd]

Hello. I am new in working with pumps in HecRas and my first model is not quite simple, so some advice could be very helpful.

I have a model with 2 cascade reservoirs and 1 storage (please see attachments). I need to pump the water from the Reservoir 2 in the Storage and after that discharge back from the Storage in the Reservoir 2.
The storage is located with 150 m above the Reservoir 2, on a very high hill. Which is the best option for modeling the discharge back in the Reservoir 2? My approach was to create the dam with the spillway and a fictive channel but the difference in level is too big so the model doesn’t run. In the reality, the water discharge is done under the ground with a spillway directly in the right bank of Reservoir 2.

Is it possible to introduce a reverse pump (pumping and abstracting) in HecRas? Is it possible to describe a pump without the pump curve?

Regards,
Cristina

[Anonymous]

Instead of using an inline structure to model the dam, maybe you could use a lateral structure to model the dam. Create the lateral structure between the river and the storage area. That way, you do not have to have a channel between the dam and the river/reservoir. You could use a rating curve on the lateral structure or gates to control the discharge.

As far as describing a pump without the pump curve: you could probably do that using the advanced rule capability. For a lateral structure, you can use if-then tests and simple math equations. You could use these rules to compute a given flow that you wanted released from the storage area. This option can be a bit complicated, but there are some rule examples that are part of the RAS sample data sets.

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