Clary Lake Gate Flow Calculations
 Share
The version of the browser you are using is no longer supported. Please upgrade to a supported browser.Dismiss

 
View only
 
 
ABCDEFGHIJKLMNOPQRSTUVWXYZ
1
CFS Outflows for Different Sluice Gate Openings for a Given Water Level
Standard Contracted Rectangular Weir Calculations
Broad Crested Weir Calculations
2
Clary Lake Association
When the lake level reaches the high water mark, the top of the dam becomes a uncontrolled spillway over it's entire length which is about 100' long, more or less. This calculates flows over the top of the dam in increments of 1/10th of a foot.
3
Prepared by George Fergusson January 6, 2019
4
Length L5.00
5
Any Openingb3.00Length L:100
6
Y21.7P5.00C:3.08736973
7
Y17.67H1.00
8
Cc0.61Q15.98HQ (cfs)
9
g32.170.00.0
10
Cd0.5725234040.19.8
11
V212.71836999
Elevation of bottom of weir: 142' ±
H0.227.6
12
q59.45837972NHWM:151.170.10.520.350.7
13
q+261.45837972
See this site for more information:
Water Level-1.50.21.480.478.1
14
Gate Leakage:2
http://ponce.sdsu.edu/onlinechannel13.php
Weir Depth Y17.670.32.700.5109.2
15
Sluice Opening Y2
(water level in ft below hwm)
0.44.140.6143.5
16
InchesFeetCFS Outflowwith 2 cfs leak
Discharge coefficient Cd
Reference Velocity V2
0.55.770.7180.8
17
000.002.00.6113.550897030.67.550.8220.9
18
10.08333.125.10.607989389413.506232150.79.480.9263.6
19
20.16666.218.20.605998530113.462006040.811.531.0308.7
20
30.24999.2911.30.604027100713.418211550.913.701.1356.2
21
40.333212.3414.30.602074787313.37484172115.981.2405.8
22
50.416515.3817.40.600141282913.331889721.118.361.3457.6
23
60.499818.4020.40.598226287513.289348891.220.841.4511.4
24
70.583121.4023.40.596329507513.247212711.323.401.5567.2
25
80.666424.3826.40.594450656113.205474811.426.041.6624.8
26
90.749727.3429.30.592589452613.164128941.528.751.7684.3
27
100.83330.2832.30.5907456224
Approximate
13.123169021.631.541.8745.6
28
110.916333.2135.20.5889188969error13.08258907
The Gate in the dam is not circular! The bottom 13.5" is closed!
1.734.401.9808.6
29
120.999635.3937.40.58710901330.9813.04238326
At 12" opening, calculated area = 398 sq in., actual area = 392 sq in. (98%) Very close!
1.837.312.0873.2
30
131.082938.1140.10.58531571430.97713.00254586CFS results below this line will be increasingly in error because calculations assume a rectangular orifice1.940.29
31
141.166240.8342.80.58353874830.97512.9630713243.33
32
151.249543.5245.50.58177786870.97312.923954092.146.41
33
161.332846.1448.10.58003283440.9712.885188882.249.55
34
171.416146.8748.90.5783034090.9312.84677041
35
181.499447.3549.30.57658936140.8912.80869355
36
191.582748.1550.20.57489046480.8612.77095327
37
201.66649.3651.40.57320649750.8412.73354463
38
Max Open: 20.51.7149.3851.40.57232295840.8212.71391718Fully open, flow is 82% lower than calculated or about 55 cfs when the lake is full.
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
This picture shows the obstruction across the bottom of the 34" diameter outlet pipe that represents a reduction in area of about 37%
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Loading...
Main menu