Fluid mechanics. The aims for the calibration of a sharp Crested Weir where to show the difference between Q theoretical, supposed theoretical discharge over the Weir and Q actual (Qa) the actual discharges of water over the Weir.

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  1. Introduction/aims

The aims for the calibration of a sharp Crested Weir where to show the difference between Q theoretical, supposed theoretical discharge over the Weir and Q actual (Qa) the actual discharges of water over the Weir.

  1. Method

 Water  pumped into the channel behind the Weir, The Vernier scale was set to zero. When water level just did not flow over the edge of the Weir (U Notch  Weir). The pump and Valve where then switched on so that there was a constant flow of water over the Weir. The water was left to obtain a constant and settled flow. The drain plug was then inserted to allow the flow of water to collecting in the tank in order for measurement (L) to be taken. At the level of 20 litres the value of (H) was taken and the discharge for the 20 litres was timed by 2 students T1(Second)  and T2(Second), Then the Mean time was recorded as Tmean (Second) .

The same procedure was repeated with different volumes of water (20L, 10L, 5L) at each time the high of head (H) of water over the Weir, T1(Second) and T2(Second)  as Tmean recorded.

  1. Results

See appendices

4.Conclusion

As the measure Discharge Qa falls the difference between the theoretical discharge Qt become the  greater as a flow of water become slower. This due to the height of the head falling the distance between Qt and Qa basically remains as a constant as the Cd coefficient of discharge  drops.

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5.Discussion: Over all experiment was significant success except there were some minor errors  when  these results were plotted on the graphs those could be as a result of setting time difference or different reading of the heights. Again those errors probably due to lack of concentration, and also. Some times may have been recorded wrongly and the height over the head may have been noted wrongly.

6.Nomenclature

 is the actual discharge over the weir

 is the theoretical discharge over the weir

Cd is coefficient of discharge

H is the head of the weir in meter

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