Use Table C-4 for the following: a. A rectangular channel is 4 m wide and has a longitudinal slope of 0.002. The channel is poured concrete and it is discharging a uniform flow at 25 m3/s. What is the normal depth? Use Table C-4 for the roughness coefficient.b. A trapezoidal channel is designed for a uniform flow of 170 cfs. The channel has 8 ft bottom width and a side slope of 2 horizontal to 1 vertical. If the channel longitudinal slope is 0.001, what will be the normal depth? The channel material is asphaltic concrete. Use Table C-4 for the roughness coefficient. Table C-4. Average Manning Roughness Coefficients for Larger Open ChannelsChannelManning Roughness Coefficient(n)Unlined ChannelsClay LoamSand0.0230.020Lined ChannelsGrass Lined (well maintained)Grass Lined (not maintained)0.0350.045Wetland-Bottom Channels (NewChannel)0.023|Wetland-Bottom Channels (MatureChannel)See Table A-5Riprap-Lined ChannelsSee Chapter 7, Section 7.6.17Concrete (Poured)0.014Air Blown Mortar (Gunite or Shotcrete)) 0.016Asphaltic Concrete orBituminous Plant Mix0.018(1) For air blown concrete, use n=o.012 (if troweled) and n=0.025 if purposely roughened.Note: For channels with revetments or multiple lining types, use composite Manning roughness coefficientbased on component lining materials.

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Answered: a. A rectangular channel is 4 m wide…

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

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Use Table C-4 for the following:

a. A rectangular channel is 4 m wide and has a longitudinal slope of 0.002. The channel is poured concrete and it is discharging a uniform flow at 25 m3/s. What is the normal depth? Use Table C-4 for the roughness coefficient.

b. A trapezoidal channel is designed for a uniform flow of 170 cfs. The channel has 8 ft bottom width and a side slope of 2 horizontal to 1 vertical. If the channel longitudinal slope is 0.001, what will be the normal depth? The channel material is asphaltic concrete. Use Table C-4 for the roughness coefficient.

Table C-4. Average Manning Roughness Coefficients for Larger Open Channels
Channel
Manning Roughness Coefficient(n)
Unlined Channels
Clay Loam
Sand
0.023
0.020
Lined Channels
Grass Lined (well maintained)
Grass Lined (not maintained)
0.035
0.045
Wetland-Bottom Channels (New
Channel)
0.023
|Wetland-Bottom Channels (Mature
Channel)
See Table A-5
Riprap-Lined Channels
See Chapter 7, Section 7.6.17
Concrete (Poured)
0.014
Air Blown Mortar (Gunite or Shotcrete)) 0.016
Asphaltic Concrete or
Bituminous Plant Mix
0.018
(1) For air blown concrete, use n=o.012 (if troweled) and n=0.025 if purposely roughened.
Note: For channels with revetments or multiple lining types, use composite Manning roughness coefficient
based on component lining materials.

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