Clary Lake Gate Flow Calculations
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CFS Outflows for Different Sluice Gate Openings for a Given Water Level
Standard Contracted Rectangular Weir Calculations
Broad Crested Weir Calculations
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Clary Lake Association
100.00When 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.
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Prepared by George Fergusson January 6, 2019
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Length L5.00
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Any Openingb5.00Length L:96
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Y20.08P5.00C:3.08736973
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Y16.96H0.34
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Cc0.61Q3.26HQ (cfs)
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g32.170.00.0
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Cd0.6078726745L:5.000.19.4
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V212.86345908
Elevation of bottom of weir: 142' ±
H0.226.5
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q2.850542532NHWM:151.170.10.520.348.7
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q+23.350542532
See this site for more information:
Water Level-1.210.21.480.475.0
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Gate Leakage:0.5
http://ponce.sdsu.edu/onlinechannel13.php
Weir Depth Y16.960.32.700.5104.8
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Sluice Opening Y2
(water level in ft below hwm)
0.44.140.6137.7
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InchesFeetCFS Outflowwith 2 cfs leak
Discharge coefficient Cd
Reference Velocity V2
0.55.770.7173.6
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000.000.50.6112.908476340.67.550.8212.1
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10.08332.973.50.607785399712.861612220.79.480.9253.1
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20.16665.916.40.605594745812.815254830.811.531.0296.4
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30.24998.849.30.603427609912.769395120.913.701.1341.9
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40.333211.7412.20.601283574112.72402425115.981.2389.6
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50.416514.6315.10.599162231112.679133581.118.361.3439.3
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60.499817.4918.00.597063183212.634714711.220.841.4491.0
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70.583120.3420.80.594986042712.590759431.323.401.5544.5
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80.666423.1623.70.592930431112.547259741.426.041.6599.8
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90.749725.9726.50.590895979112.504207811.528.751.7657.0
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100.83328.7529.30.5888823261
Approximate
12.461596021.631.541.8715.8
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110.916331.5232.00.5868891201error12.41941692
The Gate in the dam is not circular! The bottom 13.5" is closed!
1.734.401.9776.2
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120.999633.5934.10.58491601750.9812.37766324
At 12" opening, calculated area = 398 sq in., actual area = 392 sq in. (98%) Very close!
1.837.312.0838.3
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131.082936.1536.70.58296268250.97712.33632786CFS results below this line will be increasingly in error because calculations assume a rectangular orifice. They've been adjusted by the amounts in column F1.940.29
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141.166238.7339.20.58102878730.97512.29540386243.330.82220.1
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151.249541.2741.80.57911401150.97312.254884452.146.41
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161.332843.7444.20.57721804220.9712.214763022.249.55
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171.416144.4144.90.57534057350.9312.17503308
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181.499445.3645.90.57348130650.912.135688320.577.00
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191.582745.6146.10.5716399490.8612.09672255
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201.66646.7447.20.56981621520.8412.05812973
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Max Open: 20.51.7146.7647.30.56885991630.8212.03789307Fully open, flow is 82% lower than calculated or about 55 cfs when the lake is full.
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Gate Openings to release Minimum Flows
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Assumptions: Water Level -2 below HWM
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Date
Minimum Flow
Gate Opening
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1-1 to 3-1511.30.320.28
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3-16 to 5-1535.91.04
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5-16 to 6-308.30.24
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7-1 to 9-151.90.06
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9-16 to 11-153.50.1
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11-16 to 12-3115.50.45
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This picture shows the obstruction across the bottom of the 34" diameter outlet pipe that represents a reduction in area of about 37%
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150.890.01
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150.900.01
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150.910.01
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150.920.01
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150.930.04
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150.940.08
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150.950.13
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150.960.19
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150.970.28
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150.980.41
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150.990.56
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151.000.74
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151.010.97
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151.021.23
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151.031.53
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151.041.85
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151.052.21
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151.062.60
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151.073.03
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151.083.51
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151.094.03
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151.104.60
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151.115.24
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151.125.93
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151.136.68
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151.147.49
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151.158.37
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151.169.30
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