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Broad Crested Weir Interference

Broad Crested Weir Interference

Broad Crested Weir Interference

(OP)
I have an existing dam outlet that in plan is two broadcrested weirs that are 90 degrees to one another. The longer broadcrested weir (~14') is located perpindicular to the flow and the shorter broadcrested weir (~10') is located parallel to the flow.

I know the design flows over the spillway. I am trying to calculate the water height during a 100-year storm.

Is there a procedure that should be used to account for the interference due to the layout? Should I just use the sum of the two weirs as the weir length? A fraction of the sum?

Any insight or documentation of a similar case would be appreciated.

RE: Broad Crested Weir Interference

If I understand the configuration, one is perpendicular to flow and one parallel to flow, correct?.  For that configuration I would consult Chow, Open Channel Hydraulics for side weir flow leaving while using the perpendicular weir as control.  Hopefully, I understand the layout.

RE: Broad Crested Weir Interference

you will need to adjust your side flow weir to account for momentum losses.  The flow has to turn 90 deg and flow towards the weir crest.  

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