Determination of flow surface profile imperfection allowing hydraulic drop at mid section of contraction


Determination of flow surface profile imperfection allowing hydraulic drop at mid section of contraction?  When Q = 100 cfs.



Solution:


E = y + V2/2g
E = y + Q2/2gA2
E = 5 + 1002 /2 × 32.2 × 102 × 52
E = 5.06’

Now
Yc =2E/3
Yc = 3.37’

And, E= Yc + Q2/2gA2
     5.06 = 3.37 + 1002 /2 × 32.2 × bc2 × 3.372
     Bc  =  2.84’

Slope;
Before Mid Section
S1 = (10-2.84)/25 = 0.286
After Mid Section
S2 = (8-2.84)/25 = 0.206


  Table: Flow Surface Profile
Length (L)
Breadth
Depth (y)
( Ft )
( Ft )
( Ft )
( Ft )
0
10
5
0.589
5
8.57
4.974
0.696
10
7.14
4.934
0.851
15
5.71
4.858
1.096
20
4.28
4.672
1.555
25
2.85
3.494
3.249
30
3.88
4.565
1.77
35
4.91
4.778
1.31
40
5.94
4.875
1.047
45
6.97
4.928
0.873
50
8
4.96
0.75



 Flow Surface Profile:



Determination of flow surface profile imperfection allowing hydraulic drop at mid section of contraction Determination of flow surface profile imperfection allowing hydraulic drop at mid section of contraction Reviewed by Muhammad Najam Abbas on 11:57 AM Rating: 5

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