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Tailwater effect on a broad crested weir

Tailwater effect on a broad crested weir

Tailwater effect on a broad crested weir

(OP)
How does HydroCAD calculate the tailwater effect on a broad crested weir?  I am trying to model a ditch plug that doesn't come to the top of the existing ditch.  I don't have any downstream data, so any tailwater I put in has to be Stor-Ind routed.  I played with the differential tailwater setting on the advanced tab and was wondering where the numbers came from.

RE: Tailwater effect on a broad crested weir

To allow for tailwater effects on a broad-crested weir, HydroCAD uses a submergence adjustment as discussed in Handbook of Hydraulics by Brater & King (p.5-18)

You will find full details in HydroCAD help.  See "Submerged,Weir" in the help index.

This information is also included on  page 90 of the HydroCAD-8 Owner's Manual.

RE: Tailwater effect on a broad crested weir

If you have other tailwater effects that need to be modeled you should probably use the Dynamic Storage-Indication method.  Although the manual tailwater options are disbled when using DSI, you can use a link to define a manual tailwater elevation (constant, tidal, or elev.vs.time)  For details see www.hydrocad.net/dsi.htm

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