results n calculation-Flow Over Weirs
Results
Part A: Rectangular Notch
Width of rectangular notch, B = 3.00 cm
Volume (L)
Height, H (m)
Time, t (s)
3.00
0.01
26.73
3.00
0.02
14.76
3.00
0.03
8.91
3.00
0.04
5.40
3.00
0.05
3.55
3.00
0.06
3.01
Part B: Vee Notch
Enclosed angle of Vee notch, θ = 90°
Volume (L)
Height, H (m)
Time, t (s)
3.00
0.01
56.20
3.00
0.02
15.84
3.00
0.03
7.56
3.00
0.04
3.64
Calculations
Part A: Rectangular Notch
Volume Collected (m3)
Height of Water Level, H (m)
Time for Collection, t (s)
Volume Flow Rate, Qt (m3/s)
H3/2 Rectangular Notch (m3/2)
Rectangular Notch Discharge Coefficient, Cd
0.003
0.010
26.73
1.12×10-4
1.00 × 10-3
1.264
0.003
0.020
14.76
2.03×10-4
2.83 × 10-3
0.810
0.003
0.030
8.91
3.37×10-4
5.20 × 10-3
0.732
0.003
0.040
5.40
5.56×10-4
8.00 × 10-3
0.785
0.003
0.050
3.55
8.45×10-4
1.12 × 10-2
0.852
0.003
0.060
3.01
9.97×10-4
1.47 × 10-2
0.766
For first reading:
1. Volume Flow Rate, Qt
2. Rectangular Notch, H3/2
3. Discharge Coefficient, Cd
4. Percentage Error
From the theory, the Cd value is 0.6
From the table, one value of Cd is taken which is, Cd = 0.732
Part B: V-Notch
Volume Collected (m3)
Height of Water Level, H (m)
Time for Collection, t (s)
Volume Flow Rate, Qt (m3/s)
H5/2 Rectangular Notch (m3/2)
Vee Notch Discharge Coefficient, Cd
0.003
0.01
56.20
5.34×10-5
1.00 × 10-5
2.260
0.003
0.02
15.84
1.89×10-4
5.66 × 10-5
1.414
0.003
0.03
7.56
3.97×10-4
1.56 × 10-4
1.077
0.003
0.04
3.64
8.24×10-4
3.20 × 10-4
1.090
For first reading:
1. Volume Flow Rate, Qt
2. Vee Notch, H5/2
3. Discharge Coefficient, Cd
4. Percentage Error
From the theory, the Cd value is 0.6
From the table, one value of Cd is taken which is, Cd = 1.077
Part A: Rectangular Notch
Width of rectangular notch, B = 3.00 cm
Volume (L)
Height, H (m)
Time, t (s)
3.00
0.01
26.73
3.00
0.02
14.76
3.00
0.03
8.91
3.00
0.04
5.40
3.00
0.05
3.55
3.00
0.06
3.01
Part B: Vee Notch
Enclosed angle of Vee notch, θ = 90°
Volume (L)
Height, H (m)
Time, t (s)
3.00
0.01
56.20
3.00
0.02
15.84
3.00
0.03
7.56
3.00
0.04
3.64
Calculations
Part A: Rectangular Notch
Volume Collected (m3)
Height of Water Level, H (m)
Time for Collection, t (s)
Volume Flow Rate, Qt (m3/s)
H3/2 Rectangular Notch (m3/2)
Rectangular Notch Discharge Coefficient, Cd
0.003
0.010
26.73
1.12×10-4
1.00 × 10-3
1.264
0.003
0.020
14.76
2.03×10-4
2.83 × 10-3
0.810
0.003
0.030
8.91
3.37×10-4
5.20 × 10-3
0.732
0.003
0.040
5.40
5.56×10-4
8.00 × 10-3
0.785
0.003
0.050
3.55
8.45×10-4
1.12 × 10-2
0.852
0.003
0.060
3.01
9.97×10-4
1.47 × 10-2
0.766
For first reading:
1. Volume Flow Rate, Qt
2. Rectangular Notch, H3/2
3. Discharge Coefficient, Cd
4. Percentage Error
From the theory, the Cd value is 0.6
From the table, one value of Cd is taken which is, Cd = 0.732
Part B: V-Notch
Volume Collected (m3)
Height of Water Level, H (m)
Time for Collection, t (s)
Volume Flow Rate, Qt (m3/s)
H5/2 Rectangular Notch (m3/2)
Vee Notch Discharge Coefficient, Cd
0.003
0.01
56.20
5.34×10-5
1.00 × 10-5
2.260
0.003
0.02
15.84
1.89×10-4
5.66 × 10-5
1.414
0.003
0.03
7.56
3.97×10-4
1.56 × 10-4
1.077
0.003
0.04
3.64
8.24×10-4
3.20 × 10-4
1.090
For first reading:
1. Volume Flow Rate, Qt
2. Vee Notch, H5/2
3. Discharge Coefficient, Cd
4. Percentage Error
From the theory, the Cd value is 0.6
From the table, one value of Cd is taken which is, Cd = 1.077