This experiment was conducted in order to have a broader knowledge on hydraulic jump and its
applications. It was performed in the hydraulic laboratory of the department of Water Resources
and Environmental Engineering, Ahmadu Bello University, Zaria, using the TQH23, 2.52m flow
rectangular channel and the HID hydraulic bench which provides water to the channel with the
aid of the pump incorporated in the HID.
Five different discharges were obtained by varying the flow. Hydraulic jump was formed at four
different positions for each of the discharge using both rectangular block weir and sluice gate
while maintaining the same discharge.
Based on the results obtained and calculated from the experiment after comparing rectangular
block weir and the sluice gat, it was observed that when using the rectangular block weir that
discharges shows an oscillating jump type since the value of their
Froude’s number, ratio of depth after and before the jump and fraction of energy dissipated
falls within the range of the characteristics of hydraulic jump, also from fig 4.3 shows that at a
height of 0.035m, 0.037m and 0.038m of the downstream sequent depth will dissipate excess
energy compare to sluice gate.
Also, for sluice gate, discharge = 0.556×
/s with = 3.74, = 3.33 and
fraction of energy dissipated = 44.83% formed an oscillating jump which it value of Froude’s
number, ratio of depth after and before the jump and fraction of energy dissipated fall within the
range of the characteristics of hydraulic jump. And also discharge = 0.625×
/s with
=6.29, = 6.03 and fraction of energy dissipated = 66.67% formed a stable clearly
defined well balanced which it value of Froude’s number, ratio of depth after and before the
jump and fraction of energy dissipated fall within the range of the characteristics of hydraulic
jump. While the remaining discharges and are out of range that means there values
did not fall within the range of the characteristics of hydraulic jump of table 2.2. and also fig 4.3
shows that at a height of 0.041m of downstream sequent depth will dissipate excess energy
compared to rectangular block weir.
