A rectangular stream channel is 300 ft wide and carries a flow of 15,000 cfs. The depth of flow is 10 ft. A bridgewith symmetric embankments is to be constructed over the channel. Without considering head losses,determine the depth of flow in the constriction (y2 ) and upstream of the bridge (y3) for bridge lengths (B) of250 ft, 200 ft, 150 ft, 100 ft and 50 ft.

To determine the depths of flow in the constriction (y2) and upstream of the bridge (y3) for…

Answered: A rectangular stream channel is 300 ft…

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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A rectangular channel has a width of 2.0 m and carries a flow of 3.0 cms. If the depth of flow at a section is 0.35 m, calculate 1) Specific energy at that section, 2) flow depth alternative to the existing depth, 3) Froude number at the alternative depth, and 4) critical depth. Ans: (hint: consider C.E and S.E.)
A 119-degree V-notch-weir was installed to measure the flow in an artificial channel. The crest of the weir is located 2.25m high relative to the channel bed. Depth of overflow above the crest is 0.41m. Determine the discharge in L/s. Neglect velocity of approach. c = 0.58.
A lined rectangular channel with Manning's n = 0.015 is 5 m wide and has a flow depth of 2m with the bed slope of 1 in 1600. Retaining the rectangular shape of channel section and the same total area of lining, to what maximum extent can the discharge be increased without changing the bed slope? Does the flow change from sub critical to super critical state by this increase in discharge.
4. A vider is 30 m the of wide and has a rectangular shape. At a bridge location the flow width is restricted to 25m by the piers bridge and the river bed is approximately horizontal. Describe the obtains underneath the bridge with minimum upstream which flow "depth when a flood of 450 m³/s flows in the river
A rectangular open channel of width 5.0 m is carrying a discharge of 100 m³/s. The Froude number of the flow is 0.8. What is the depth of flow (in m) in the channel.
Q7] A trapezoidal channel has a bed width of 3.0 m and a side slope of 1:1. When the discharge was 2.5 m³/s, the normal depth was observed to be 0.85 m. Estimate the discharge in the channel when the normal depth is 1.20 m.
A 6.0 m rectangular channel carries a of 30 m³/s at a depth of 2.5 m. the channel width that produces discharge Determine the critical depth.
Open channel.
(b) Water is flowing uniformly with flow rate 18.6 m3/s and water depth 1.2 m in a rectangular open channel of width 8 m. A temporary short span bridge is proposed to be constructed across the channel in which bridge embankment is needed at both sides of the channel causing the channel to be constricted under the proposed bridge. (i) Calculate the maximum channel width under the proposed bridge that will not cause backwater upstream.

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