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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.

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.

Structural Analysis
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. 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. Table C-4. Average Manning Roughness Coefficients for Larger Open Channels Channel Manning Roughness Coefficient(n) Unlined Channels Clay Loam Sand Lined Channels Grass Lined (well maintained) Grass Lined (not maintained) Wetland-Bottom Channels (New Channel) 0.023 0.020 0.035 0.045 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)(¹) 0.016 Asphaltic Concrete or Bituminous Plant Mix 0.018 (¹) For air blown concrete, use n=0.012 (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.
Transcribed Image Text: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. Table C-4. Average Manning Roughness Coefficients for Larger Open Channels Channel Manning Roughness Coefficient(n) Unlined Channels Clay Loam Sand Lined Channels Grass Lined (well maintained) Grass Lined (not maintained) Wetland-Bottom Channels (New Channel) 0.023 0.020 0.035 0.045 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)(¹) 0.016 Asphaltic Concrete or Bituminous Plant Mix 0.018 (¹) For air blown concrete, use n=0.012 (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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