Flow-Match Outlet
HydroCAD-10.1
release 5a
provides a new outlet option for modeling automated flow-matching outlets, such as
the Flood-Con automated
control structure, shown at the right
This outlet device will match the specified reference flow, which can come from any node within the current project. This could be a link (used to import or manually enter the reference flow), or a complete watershed simulation (such as the pre-existing site conditions).
The outflow will also be limited by the fully-open dimensions of the device inlet. If the orifice/weir capacity of the opening (including any tailwater effects) is less than the target flow at any time during the routing, the outflow will be limited to that weir/orifice capacity. Otherwise the outflow will match the reference flow.
Because the discharge is not a strict function of the pond's water surface elevation, a flow-match outlet requires the use of a dynamic pond routing procedure. This also allows the outlet to respond to tailwater conditions created by a downstream reach or pond.
For details see "flow match outlet" in HydroCAD help. Also see the "Outlet Examples" file that is preinstalled with HydroCAD.