A high overflow spillway with P/H> 1.33 has a maximum discharge of 5,000 cfs with a maximum head of 15 ft. Determine the design head (in feet), spillway crest length (in feet), minimum pressure head (in feet) and the minimum pressure (in psi) on the spillway. Figure 6.2 Discharge Coefficient for the WES standard spillway shape Correction factor PHICH 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0.6 0.5 0.4 0.3 0.2 0.1 ос Upstream face slope: 3 on 3 0.70 3 on 1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 PIH 3 on 2 0.75 0.80 1.3 1.2 1.1 1.0 0.9 0.8 0.7 PIH=0.20- 0.33 0.67 1.00- H₂ 0.85 0.90 C/Co in which Co = 4.03 177 H₂ 1.33 or greater Q=CLH₂5 H₂-velocity head He design total head H.- actual total head 0.95 1.00

A high overflow spillway with P/H> 1.33 has a maximum discharge of 5,000 cfs with a maximum head of 15 ft. Determine the design head (in feet), spillway crest length (in feet), minimum pressure head (in feet) and the minimum pressure (in psi) on the spillway. Figure 6.2 Discharge Coefficient for the WES standard spillway shape Correction factor PHICH 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0.6 0.5 0.4 0.3 0.2 0.1 ос Upstream face slope: 3 on 3 0.70 3 on 1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 PIH 3 on 2 0.75 0.80 1.3 1.2 1.1 1.0 0.9 0.8 0.7 PIH=0.20- 0.33 0.67 1.00- H₂ 0.85 0.90 C/Co in which Co = 4.03 177 H₂ 1.33 or greater Q=CLH₂5 H₂-velocity head He design total head H.- actual total head 0.95 1.00

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Spillway design

A spillway is the overflow portion of the dam that carries the surplus discharge flow from the reservoir to the downstream, that is, it carries the flood water safely downstream, which is enough to be stored in that reservoir. Therefore, it acts as a safety valve for the dam because many failures of the dam arise due to the incorrect design of the spillway.

Question

Figure 6.3 (a) Crest pressure on
WES high-overflow spillway no
Pressure
Design Head H
0.6
0.4
-.43
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
H/Hd=0.50
R=0.04Hd
H/H= 1.00
H/H= 1.17
H/Hd=1.33
-0.2
H/H= 1.50
R=0.20Hd
0
Figure 6.3 (b) Standard WES Ogee
Spillway Shape
Axis both quadrants
R=0.50H
piers
0.2 0.4 0.6 0.8 1.0 1.2
Horizontal Distance
Design Head
(A.)
Crest
X1.85 = 2H0.85 y

A high overflow spillway with P/H> 1.33 has a maximum
discharge of 5,000 cfs with a maximum head of 15 ft.
Determine the design head (in feet), spillway crest length (in
feet), minimum pressure head (in feet) and the minimum
pressure (in psi) on the spillway.
Figure 6.2 Discharge Coefficient
for the WES standard spillway
shape
Correction factor
PHICH
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.6
0.5
0.4
0.3
0.2
0.1
0
OC
Upstream face
slope: 3 on 3
0.70
3 on 1
0.2 0.4 0.6 0.8 1.0 1.2 1.4
PIHd
3 on 2
0.75
1.3
0.80
1.2
1.1
1.0
0.9
0.8
0.7
PIH=0.20-
0.33-
0.67
1.00-
H₂
0.85
0.90
C/Co in which Co = 4.03
1.33 or greater
Q=CLH5
H₂-velocity head
He design total head
H.- actual total head
H₂
0.95
1.00

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Step 4: Calculate Min pressure head hp(min)

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