A throttle, like vortex regulators, only releases a dimensioned flow at a specific pressure head. Compared with vortex regulators, the opening will be smaller for the same dimensioning flow, thus a throttle is prone to blocking, and requires more maintenance. Evacuation of water will be less efficient than use of a vortex regulator, and especially compared with WaReg, which features a constant flow and the biggest outlet area of the three.