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Sharp-crested weirs are control structures causing a defined backwater. Additionally, they are often used to determine the discharge of an open channel.
HM 162.30 contains four different plate weirs as sharp-crested weirs. The fundamentals of flow over sharp-crested weirs are demonstrated with the rectangular weir with optional aeration. The other weirs are typical measuring weirs with defined openings: the opening of the Thomson weir is triangular, the opening of the Rehbock weir is rectangular and for the Cipoletti weir, it's trapezoidal.
The weir to bei studied is inserted in a frame. The frame is mounted into the experimental section of HM 162.
Learning Objectives / Experiments
- free and submerged overfall at the sharp-crested weir
- effect of aeration on flow processes at plate weirs
* nappe observation of separation at a sharp-crested weir
together with a level gauge:
- plate weirs as measuring weirs
* determination of the discharge coefficient
* comparison of the measuring weirs (Cipoletti, Rehbock, Thomson)
- determination of the discharge
- comparison of the theoretical and the measured discharge