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University of Duhok
College of Engineering
Civil Department
Fluid Mechanics – Practical
Fluid Laboratory
A Report About :
Discharge under a Sluice Gate
Student Name : Jameel Masoud Jameel
Class : B
Date of Experimental : 16 / 4 / 2018
Date of Submitting : 25 / 4 / 2018
Experiment No. : 3
Procedures :
1) Make sure that discharge Apparatus is leveled, a sluice gate is
available and placed carefully and normal to the channel and note the
height of gate opening (b) that required for calculation.
2) Fill the discharge apparatus (Open channel Place) with water until the
water flow from in channel and water passes the sluice gate.
3) After water surface will steady, read the water surface height before
the sluice gate (y1), and with computing (y2) the theory discharge will
computed.
4) Then, Write the times from the beginning of filling the discharge Tank
with water to the time that we want and note the volume collected
between this short time to compute the Actual Discharge.
5) Reaped the procedure to calculate the discharge of different Water
quantinty and its collected volume in different time .
b
Calculations and Results :
Note : ( 𝐛) = 𝟏𝐜𝐦 , 𝐲𝟐 = 𝐂𝐜 × 𝐛 = 𝟎. 𝟔 × 𝟏 = 𝟎. 𝟔𝐜𝐦 , 𝐋 = 𝟕. 𝟓𝐜𝐦
Example: If Volume = 5 lt . Time = 12.55 sec . y1 = 3.75cm
Rotameter = 0.41 l/s
-The discharge can be calculated using the following formula :
Qth = L × b × √2g(y1 − y2)
Qth = 0.075 × 0.01 × √2g(0.375 − 0.0061) = 0.559 l3
/sec
Qact =
Volume
Time
=
5
12.55
= 0.40 l3
/sec
Cd =
Qact
Qth
=
1.96
0.559
= 0.68
Details Table :
No.
Volume
(l)
Time
(sec)
Rotameter
(l/sec)
y1
(cm)
y2(cm)
Qact
(l/sec)
Qth
(l/sec)
Cd
1 5 12.55 0.41 3.75 0.61 0.40 0.559 0.68
2 10 15.8 0.64 7.66 0.61 0.63 0.88 0.72
3 15 23.7 0.65 8.46 0.61 0.63 0.93 0.68
4 20 27.8 0.73 10.15 0.61 0.72 1.03 0.7
5 20 25.92 0.75 12.39 0.61 0.77 1.14 0.68
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1 10 100
Qact(l/sec)
H cm (y1-y2)
Relationship Between Qact and H
𝐐 = 𝟎. 𝟐𝟐𝟒𝟖𝐇−𝟎.𝟓𝟎𝟗𝟕
Discussion and Conclusion :
In this test we determine the discharge using an artificial Channel having
and sluice gate and making the ratio between the actual and theoretical
discharge, finally we got a result after doing all procedure accurate which
is the discharge under gate, as shown in our result that discharge is
opposite to opening gate height and with increasing opening gate height
the discharge will be increase, and we found the logarithm equation of
determining the ratio between actual Discharge and Height of water
between two place which are before and after sluice gate using the Gauge
reading.
In conclusion the purpose of this test is to determine the actual discharge
under a sluice gate and compare it with theory, and compute the ratio
between actual and theory. Finally, we know that how test was doing and
how to compute the theory discharge and actual using the small Artificial
channel.

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Discharge Under a Sluice Gate | Jameel Academy

  • 1. University of Duhok College of Engineering Civil Department Fluid Mechanics – Practical Fluid Laboratory A Report About : Discharge under a Sluice Gate Student Name : Jameel Masoud Jameel Class : B Date of Experimental : 16 / 4 / 2018 Date of Submitting : 25 / 4 / 2018 Experiment No. : 3
  • 2. Procedures : 1) Make sure that discharge Apparatus is leveled, a sluice gate is available and placed carefully and normal to the channel and note the height of gate opening (b) that required for calculation. 2) Fill the discharge apparatus (Open channel Place) with water until the water flow from in channel and water passes the sluice gate. 3) After water surface will steady, read the water surface height before the sluice gate (y1), and with computing (y2) the theory discharge will computed. 4) Then, Write the times from the beginning of filling the discharge Tank with water to the time that we want and note the volume collected between this short time to compute the Actual Discharge. 5) Reaped the procedure to calculate the discharge of different Water quantinty and its collected volume in different time . b
  • 3. Calculations and Results : Note : ( 𝐛) = 𝟏𝐜𝐦 , 𝐲𝟐 = 𝐂𝐜 × 𝐛 = 𝟎. 𝟔 × 𝟏 = 𝟎. 𝟔𝐜𝐦 , 𝐋 = 𝟕. 𝟓𝐜𝐦 Example: If Volume = 5 lt . Time = 12.55 sec . y1 = 3.75cm Rotameter = 0.41 l/s -The discharge can be calculated using the following formula : Qth = L × b × √2g(y1 − y2) Qth = 0.075 × 0.01 × √2g(0.375 − 0.0061) = 0.559 l3 /sec Qact = Volume Time = 5 12.55 = 0.40 l3 /sec Cd = Qact Qth = 1.96 0.559 = 0.68 Details Table : No. Volume (l) Time (sec) Rotameter (l/sec) y1 (cm) y2(cm) Qact (l/sec) Qth (l/sec) Cd 1 5 12.55 0.41 3.75 0.61 0.40 0.559 0.68 2 10 15.8 0.64 7.66 0.61 0.63 0.88 0.72 3 15 23.7 0.65 8.46 0.61 0.63 0.93 0.68 4 20 27.8 0.73 10.15 0.61 0.72 1.03 0.7 5 20 25.92 0.75 12.39 0.61 0.77 1.14 0.68 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1 10 100 Qact(l/sec) H cm (y1-y2) Relationship Between Qact and H 𝐐 = 𝟎. 𝟐𝟐𝟒𝟖𝐇−𝟎.𝟓𝟎𝟗𝟕
  • 4. Discussion and Conclusion : In this test we determine the discharge using an artificial Channel having and sluice gate and making the ratio between the actual and theoretical discharge, finally we got a result after doing all procedure accurate which is the discharge under gate, as shown in our result that discharge is opposite to opening gate height and with increasing opening gate height the discharge will be increase, and we found the logarithm equation of determining the ratio between actual Discharge and Height of water between two place which are before and after sluice gate using the Gauge reading. In conclusion the purpose of this test is to determine the actual discharge under a sluice gate and compare it with theory, and compute the ratio between actual and theory. Finally, we know that how test was doing and how to compute the theory discharge and actual using the small Artificial channel.