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![Page 1: SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES 2005 INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS HOOD INLET.](https://reader035.fdocuments.us/reader035/viewer/2022062713/56649ced5503460f949ba513/html5/thumbnails/1.jpg)
SITES SOFTWARE APPLICATION SITES SOFTWARE APPLICATION SEMINARSEMINAR
____________________________________________________SITES 2005SITES 2005
INTEGRATED DEVELOPMENT ENVIRONMENTINTEGRATED DEVELOPMENT ENVIRONMENTfor
WATER RESOURCE SITE ANALYSIS
HOOD INLETHOOD INLET
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The hood inlet routine has been revised. The adjustment is loosely based on the findings of Rice, 1967 with a linear transition assumed between smooth and rough pipe conditions.
The following slides show the old and new methods of computation.
![Page 3: SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES 2005 INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS HOOD INLET.](https://reader035.fdocuments.us/reader035/viewer/2022062713/56649ced5503460f949ba513/html5/thumbnails/3.jpg)
H/D
Q/D(5/2)
rough
smooth
Cs
Pipe
flow
weir
Old routine method of compsOld routine method of comps
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Slug Flow Coefficient - Hood Inlet
.01 .02
Manning’s “n”
1.05
1.56
Cs
2.0
Cs = 1.05+51(n-.01) for .01< n < .02
New hood method
![Page 5: SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES 2005 INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS HOOD INLET.](https://reader035.fdocuments.us/reader035/viewer/2022062713/56649ced5503460f949ba513/html5/thumbnails/5.jpg)
H/D
Q/D(5/2)
rough
smooth
Cs
Pipe
flow
weir
New routine for comps of slug flowNew routine for comps of slug flow
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Q/D(2.5) = (C1S(0.067) + CeH/D)(a/A)(H/D)(0.5)
C1 = 1.83
Ce = 0.6 or 1.35
S = slope of conduit
D = diameter of conduit in feet
H = head over invert in feet
a = wetted area of conduit related to flow depth in square feet
A = pipe area in square feet
![Page 7: SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES 2005 INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS HOOD INLET.](https://reader035.fdocuments.us/reader035/viewer/2022062713/56649ced5503460f949ba513/html5/thumbnails/7.jpg)
NEH-5
a = D2/4{(cos-1 x)-(x)sin(cos-1 x)}
where x = (D-2H)/D
cos-1 x is in radians
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In the slug flow region
H/D = Cs + C2(Q/D(2.5) )
C2 = 0.025
and Cs is defined by the following slide.
![Page 9: SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES 2005 INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS HOOD INLET.](https://reader035.fdocuments.us/reader035/viewer/2022062713/56649ced5503460f949ba513/html5/thumbnails/9.jpg)
Slug Flow Coefficient - Hood Inlet
.01 .02
Manning’s “n”
1.05
1.56
Cs
2.0
Cs = 1.05+51(n-.01) for .01< n < .02
New hood method
The old routine broke smooth and rough at
“n” = 0.017.
![Page 10: SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES 2005 INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS HOOD INLET.](https://reader035.fdocuments.us/reader035/viewer/2022062713/56649ced5503460f949ba513/html5/thumbnails/10.jpg)
When the slope of the pipe is very flat the equations developed for the stage - discharge relationships for the hood inlet no longer apply.
This occurs somewhere between 1% and 0% slope.
A slope of about 2.5% is the first set of data points on the hood inlet study where the equations would be valid.
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1.56
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H/D
Q/D(5/2)
Pipe f
low
wei
r
SMALL PIPE SLOPE S < 1%?SMALL PIPE SLOPE S < 1%?
(EQUATIONS NOT APPLICABLE)(EQUATIONS NOT APPLICABLE)
Approx.
Slug Flow Eq
1.0
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Linear approximation below H/D = 1
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H/D
Q/D(5/2)
Pipe f
low
wei
r
SMALL PIPE SLOPE S < 1%?SMALL PIPE SLOPE S < 1%?
(EQUATIONS NOT APPLICABLE)(EQUATIONS NOT APPLICABLE)
Approx.
Slug Flow Eq
1.0
![Page 17: SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES 2005 INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS HOOD INLET.](https://reader035.fdocuments.us/reader035/viewer/2022062713/56649ced5503460f949ba513/html5/thumbnails/17.jpg)
END OF PRESENTATION END OF PRESENTATION