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6.4
Exercise A: Sharp Crested Overshot Weir
Objective
To determine the relationship between upstream head and flowrate for water flowing over
a Sharp Crested weir.
To calculate the discharge coefficient and to observe the flow patterns obtained.
Method
By using the Sharp Crested weir installed in the C4-MkII flume and comparing the flow
characteristics under a range of flow conditions with the aeration pipe open and with the
aeration pipe closed.
Equipment Required
Armfield C4-MkII Flume with:
Sharp Crested Weir model
Hook and Point Gauge, 300mm scale
Armfield F1-10 Hydraulics Bench
Stopwatch (for flow measurement using F1-10 volumetric tank)
Optional Equipment
Direct reading flowmeter
C4-61 Pitot tube and manometer (for velocity measurement)
