4- A moderately curved channel with a slightly rounded non-cohesive bed material with adiameter of d50 = 25 mm carrying a discharge of 30 m³/s. The longitudinal slope of thechannel is 0.001 and the side wall slopes are designed to be 60% of the angle of repose of thebed materialNote: Use the Strikler's formula to calculate Manning's value.Use the Swammy and Mittal's formula to estimate the critical shear stress.Use the free board depth of 0.5m.a) Design the channel using the tractive force method for a Bo/y ratio of 20b) Design the channel using the most efficient hydraulic sectionc) Discuss about the channel stability and erosion for both designs in parts a and bStrickler (Chow, 1959) proposed a correlation between the mean diameter of bed material, deo, and theManning's coefficient as:n = 0.039d¹/6Swamee and Mittal (1976) proposed an explicit equation to express theSheild's curve defined as:T = 0.155+To500.409d²(1+0.177d²)

a) Design the channel using the tractive force method for a Bo/y ratio of 20 b) Design the channel using the most efficient hydraulic section c) Discuss about the channel stability and erosion for both designs in parts a and b

a) Design the channel using the tractive force method for a Bo/y ratio of 20 b) Design the channel using the most efficient hydraulic section c) Discuss about the channel stability and erosion for both designs in parts a and b

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.2P

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Question

4- A moderately curved channel with a slightly rounded non-cohesive bed material with a
diameter of d50 = 25 mm carrying a discharge of 30 m³/s. The longitudinal slope of the
channel is 0.001 and the side wall slopes are designed to be 60% of the angle of repose of the
bed material
Note: Use the Strikler's formula to calculate Manning's value.
Use the Swammy and Mittal's formula to estimate the critical shear stress.
Use the free board depth of 0.5m.
a) Design the channel using the tractive force method for a Bo/y ratio of 20
b) Design the channel using the most efficient hydraulic section
c) Discuss about the channel stability and erosion for both designs in parts a and b
Strickler (Chow, 1959) proposed a correlation between the mean diameter of bed material, deo, and the
Manning's coefficient as:
n = 0.039d¹/6
Swamee and Mittal (1976) proposed an explicit equation to express the
Sheild's curve defined as:
T = 0.155+
To
50
0.409d²
(1+0.177d²)

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