Problem 2: (a) Define: (i) specific energy (ii) Froude number For open-channel flow. What is special about these quantities in critical conditions? Along, wide channel has a slope of 1:900, a Manning's n of 0.015 m- 1/3 s and a discharge of 3 m3s-1 per metre width. (b) Calculate the normal and critical depths. (c) In a region of the channel the bed is raised by a height of 0.8 m over a length sufficient for the flow to be parallel to the bed over this length. Determine the depths upstream, downstream and over the raised bed, ignoring frictional losses. Sketch the key features of the flow, indicating all hydraulic transitions caused by the bed rise. (d) In the same channel, the bed is lowered by 0.8 m from its original level. Determine the depths upstream, downstream and over the lowered bed, ignoring frictional losses. Sketch the flow.

Problem 2: (a) Define: (i) specific energy (ii) Froude number For open-channel flow. What is special about these quantities in critical conditions? Along, wide channel has a slope of 1:900, a Manning's n of 0.015 m- 1/3 s and a discharge of 3 m3s-1 per metre width. (b) Calculate the normal and critical depths. (c) In a region of the channel the bed is raised by a height of 0.8 m over a length sufficient for the flow to be parallel to the bed over this length. Determine the depths upstream, downstream and over the raised bed, ignoring frictional losses. Sketch the key features of the flow, indicating all hydraulic transitions caused by the bed rise. (d) In the same channel, the bed is lowered by 0.8 m from its original level. Determine the depths upstream, downstream and over the lowered bed, ignoring frictional losses. Sketch the flow.

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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Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.

Question

Problem 2:
(a) Define:
(i) specific energy
(ii) Froude number
For open-channel flow. What is special about these quantities in critical conditions?
Along, wide channel has a slope of 1:900, a Manning's n of 0.015 m- 1/3 s and a discharge of 3
m3s-1 per metre width.
(b) Calculate the normal and critical depths.
(c) In a region of the channel the bed is raised by a height of 0.8 m over a length sufficient for
the flow to be parallel to the bed over this length. Determine the depths upstream,
downstream and over the raised bed, ignoring frictional losses. Sketch the key features of the
flow, indicating all hydraulic transitions caused by the bed rise.
(d) In the same channel, the bed is lowered by 0.8 m from its original level. Determine the
depths upstream, downstream and over the lowered bed, ignoring frictional losses. Sketch the
flow.

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