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How to manually verify peak elevation in pond with custom weir/orifice outlet?

How to manually verify peak elevation in pond with custom weir/orifice outlet?

How to manually verify peak elevation in pond with custom weir/orifice outlet?

(OP)
As the title states, I am looking to manually verify peak elevation in pond with custom weir/orifice outlet. What are the mechanics behind how HydroCAD makes this computation? Any ideas on how I might compute this manually to prove HydroCAD is modeling correctly?

Below is the summary for my pond node:

RE: How to manually verify peak elevation in pond with custom weir/orifice outlet?

The calculations are complex and time-consuming to replicate by hand. First, you would need to verify the stage-discharge curve, and then perform the hydrograph routing using the storage-indication method.

BUT, if you're having doubts about the results, I would first have a close look at the setup of your HydroCAD model. In particular, verify your device routing and the resulting stage-discharge curve.

Based on the limited info you've posted the results look reasonable. You're getting 10 CFS through a triple custom weir 1 foot wide with 1 foot of head. Why are you doubting that result?

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: How to manually verify peak elevation in pond with custom weir/orifice outlet?

(OP)
Thanks for the response, Peter. I had a feeling the hand computations might be difficult.

Personally, I am not having doubts about the results, but a reviewer on our project is. I think the reviewer is more accustomed to seeing WinTR-20 and is uncomfortable with not knowing exactly how HydroCAD works even though it is an approved software!

RE: How to manually verify peak elevation in pond with custom weir/orifice outlet?

I would ask the reviewer to be more specific about their concerns, and then address them one at a time. Remember that HydroCAD is a collection of many different H&H tools, and you need to look at the individual procedures and calculations that are being employed, rather than just jumping to the bottom line (the peak WSE in this case.)

Peter Smart
HydroCAD Software
www.hydrocad.net

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