Using a mean yo/ks of approximately 5,000, then from Figure 2.12 the average values for the energy
and momentum coefficients are:
α' = 1.024
and
β' = 1.008
As it has been assumed that α' and β' are constant across the river (for convenience), Equations
2.113 and 2.114 become:
2
α = α′ A 3 Vi2 ∆ Qi
Q i
Table 2.8. Discharge measurement notes1.
2
yoi
VI
∆zI
∆AI
∆QI
VI∆QI
Vi ∆QI
4
2
5
3
(ft)
(fps)
(ft)
(sq ft)
(cfs)
(ft /sec )
(ft /sec )
0.0
4.0
0.00
0.0
0.00
0.00
0.00
1.1
8.0
0.98
8.8
8.62
8.45
8.28
2.6
8.0
0.54
20.8
11.23
6.06
3.27
4.5
8.0
0.64
36.0
23.04
14.75
9.44
8.5
8.0
2.40
68.0
163.20
391.68
940.03
11.0
8.0
3.17
88.0
278.96
884.30
2803.24
11.6
8.0
4.02
92.8
373.06
1499.70
6028.80
12.0
8.0
4.06
96.0
389.76
1582.43
6424.65
12.8
8.0
3.78
102.4
387.07
1463.12
5530.61
12.6
8.0
3.74
100.8
376.99
1409.94
5273.19
12.4
8.0
3.78
99.2
374.98
1417.42
5357.86
11.6
8.0
4.71
92.8
437.09
2058.69
9696.45
11.4
8.0
4.30
91.2
392.16
1686.29
7251.04
10.8
8.0
4.90
86.4
423.36
2074.46
10164.87
10.6
8.0
4.63
84.8
392.62
1817.83
8416.56
10.9
8.0
4.32
87.2
376.70
1627.34
7030.13
11.4
8.0
3.89
91.2
354.77
1380.06
5368.42
11.8
8.0
3.10
94.4
292.64
907.18
2812.27
9.8
8.0
3.02
78.4
236.77
715.05
2159.44
6.4
7.0
1.69
44.8
75.71
127.95
216.24
3.8
5.5
0.0
20.9
0.0
0.0
0.0
0.0
2.5
0.0
0.0
0.0
0.0
0.0
TOTAL
163.0
1484.9
5368.74
21072.71
85494.77
1
Simons, D.B., E.V. Richardson, M.A. Stevens, J.H. Duke, and V.C. Duke, "Stream flow, groundwater
and ground response data, Hydrology Report, Vol. II, Venezuelan International Meteorological and
Hydrological Experiment, Civil Engineering Dept., Colorado State University, August 1971.
2.80
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