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Tailwater Questions

Tailwater Questions

Tailwater Questions

As per the HydroCAD Owner's Manual, "In order for tailwater effects to be automatically accommodated, two conditions must exist: 1) The upper node must use a routing procedure that is "tailwater aware"." and "2) The lower node must use a routing procedure that defines-(this word is in italics) a water surface elevation, which is seen as the tailwater for inflowing nodes."

Scenario: I have a pond (pond node) that outlets into a small ditch (reach node). Am using the Dyn-Stor-Ind for the Reach Routing and Pond Routing methods.
1. Do I have to designate a tailwater elevation in the reach to see if it would effect the pond?
2. Or would HydroCAD automatically calculate the reach conditions such that if the elevation in the ditch gets high enough, it would effect the pond outlet via the tailwater it creates as the outflow progresses? I.e., is HydroCAD automatically calculating a potential tailwater condition?

RE: Tailwater Questions

When using DSI, HydroCAD will automatically use the WSE in the reach as the tailwater for the inflowing pond(s). For details see www.hydrocad.net/tailwater.htm

As a general rule, HydroCAD will issue a warning message if an unhandled tailwater condition occurs. The lack of a warning indicates there is no tailwater and/or the tailwater is being properly incorporated into the routing calculations.

Peter Smart
HydroCAD Software

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