Flow Controls

Flow controls are considered to be either online or offline in MicroDrainage models, while InfoDrainage allows these to be specified as outlets.

Online/Outflow- restricts the flow directly out of the location.

Offline/Overflow - acts as an overflow with flow either being lost or directed to another location.  If a Loop to Index has been specified, a No Delay connection is created to connect the flow from the outlet to the destination node.

Single Flow Controls

The following flow controls are mapped directly:

• Weir
• Orifice
• Flap Valve
• Gate
• V-Notch Weir
• Filtration
• Depth/Flow
• Pump
• Elevation Controlled Pump
• Siphon
• Hydro-Brake® Optimum (Design data is maintained but due to accessing the latest Hydro International technology, they will require recalculating on import.)

Pipe

This is imported as either a connection or an orifice.

Note:

• If a Loop to Index has been specified, then the pipe is imported as a connection and connected to the destination node.
• Otherwise, an Orifice outlet is created with the diameter set to the pipe diameter.

Third party MicroDrainage flow controls

Hydro-Brake® Classic, Crown Vortex Valve®, Garastor, ACO Q-Brake, and Hydrok Hydroslide are all third party flow controls, which are not supported and cannot be mapped directly. For each of these controls the Depth/Flow table has been created and imported.

Complex Flow Controls

Occasionally, more than one flow control is required to restrict the flow for varying elevations at a given location.  To support this, the concept of a complex flow control was introduced to allow multiple flow controls to be considered at the same location. 

These are imported as a multiple outlet.