In the second scenario, when a slot is partially filled, flow was calculated considering it operates as a circular sharp-crested weir (Figure 8).
Assuming that the approach velocity is negligible, theoretical discharge Qt through circular sharp-crested weir was derived from first principles as shown in Equation (6).
In the experiments, a rectangular sharp-crested weir with 0.25 height was put normal to the direction of flow.
Discharge formula for rectangular sharp-crested weirs. Flow Measurement and Instrumentation, 22(2): 144-151.
The most common are sharp-crested weirs
, which are very thin in the direction of flow so that the flow will spring free of the weir crest.