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HydroCAD Stormwater Modeling - Since 1986


Modeling a Skimmer or Floating Outlet

Certain outlet control devices are designed to float on the surface of a pond, such that a constant head is maintained over a weir or orifice, resulting in a relatively constant discharge regardless of water surface elevation.   These devices are easily modeled by using the "Constant Flow/Skimmer" outlet added in HydroCAD-10.  This option also allows the user to specify the "phase-in depth" that is required for the full design flow to be achieved.

If the device flow is subject to significant variation with head, more precise modeling can be obtained by entering the exact rating curve with a special outlet device.  HydroCAD also includes a library of predefined rating curves, making it even easier to model any of the supported product.

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