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, dao, and the Manning's coefficient as: n = 0.039d506 Swamee and Mittal (1976) proposed an explicit equation to express the Sheild's curve defined as: 0.409d² (1+0.177d2) T = 0.155+.
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, dao, and the Manning's coefficient as: n = 0.039d506 Swamee and Mittal (1976) proposed an explicit equation to express the Sheild's curve defined as: 0.409d² (1+0.177d2) T = 0.155+.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question

Transcribed Image Text: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 Boly 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, dso, 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:
50
0.409d²
1/2
(1+0.177d² )¹/¹²
T = 0.155+.
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