An overflow ogee spillway has six bays each of 8 m clear length and e rounded nose piers (K, = 0.01) each of 2.5 m thick. Both the abutments are darp edged (K, = 0.2). The upstream face of the spillway is vertical. Compute the discharge that will pass over the spillway at the design head, H, = 3 m. The discharge coefficient for design head C, = 2.1. Also compute the passing discharge over spillway for head over the crest H = 3.45 m. Neglect the approach velocity to the spillway. Discharge coefficients for head other than design head are given below : HIH. CIC. 0.6 0.94 0.85 0.98 1.15 1.02 1.50 1.06 Cis discharge coefficient for head H.

An overflow ogee spillway has six bays each of 8 m clear length and e rounded nose piers (K, = 0.01) each of 2.5 m thick. Both the abutments are darp edged (K, = 0.2). The upstream face of the spillway is vertical. Compute the discharge that will pass over the spillway at the design head, H, = 3 m. The discharge coefficient for design head C, = 2.1. Also compute the passing discharge over spillway for head over the crest H = 3.45 m. Neglect the approach velocity to the spillway. Discharge coefficients for head other than design head are given below : HIH. CIC. 0.6 0.94 0.85 0.98 1.15 1.02 1.50 1.06 Cis discharge coefficient for head H.

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Open Channel Flow

Open channel flow is a branch of fluid mechanics. It deals with the flow of fluid in an open conduit or free surface. In an open channel flow, gravity induces the flow of water whose surface is open to the air. This flow is free-falling rather than confined in rigid body conduits. The open channel flow depends upon two parameters that are the cross-section of the conduit and the velocity profile. Practical examples of open channel flow are streams, rivers, canals, and other drainage systems.In open channel flow, the cross-sectional area of at least one of the sides is exposed to air, and the surface of water faces atmospheric pressure. This flow is also known as free gravity flow. The cross-sectional area of the conduit can be either man-made or a natural channel. For instance, the flow in rivers and streams are natural conduits, and the flow in a canal and sanitary systems are man-made or engineered channels.

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Cis discharge coefficient for head H.
An overflow ogee spillway has six bays each of 8 m clear length and
five rounded nose piers (K.
sharp edged (K. = 0.2). The upstream face of the spillway is vertical. Compute
the discharge that will pass over the spillway at the design head, H, = 3 m. The
discharge coefficient for design head C, = 2.1.
Also compute the passing discharge over spillway for head over the crest H =
3.45 m. Neglect the approach velocity to the spillway. Discharge coefficients for
head other than design head are given below :
= 0.01) each of 2.5 m thick. Both the abutments are
%3D
%3D
%3D
НІН,
CIC.
p.
0.6
0.94
0.85
0.98
1.15
1.02
1.50
1.06

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