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Modeling lateral overflow weir connected to two ponds in series

Modeling lateral overflow weir connected to two ponds in series

Modeling lateral overflow weir connected to two ponds in series

I've got a question about handling tailwater in HEC-HMS.

Situation: I'm modeling a proposed lateral overflow weir on an existing engineered channel. Overflow from the weir, along with watershed runoff, will be collected in a detention pond (Pond #1), Pond #1 will be connected downstream to a secpmd pond (Pond #2) by two 6-foot concrete box culverts (two ponds because of a utility easement running through the property). Pond #2 will outfall into the channel downstream of the lateral weir.

My current modeling approach is to use a diversion element in HEC-HMS with the lateral weir option connecting to two reservoir elements in series, which then connect to the downstream end of the reach. I can create a tailwater rating curve for the outfall from Pond #2 based on a HEC-RAS model of the channel. My question is, how do I model the tailwater effect on the outfall from Pond #1 into Pond #2 and also from the overflow weir into Pond #1? Is this something HEC-HMS can do, or do I need to try tackling it in SWMM?

RE: Modeling lateral overflow weir connected to two ponds in series

It has been some time since I used HMS, but, I do recall that it does not account for tailwater. You can develop a rating table that accounts for submergence on a weir based on tailwater. That is an external analysis, however, and will require coding the rating table into HMS. ICPR is a program that will allow flow to be routed upstream and downstream based depending on water surface elevations. I am not sure SWMMM will do that. Hope that helps.

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