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:
- Flap Valve
- V-Notch Weir
- Level Controlled Pump
- Hydro-Brake® Optimum
This is imported as either a connection or an orifice.
- 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 levels 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.