4.58. A trapezoidal canal has a longitudinal slope of 1%, side slopes of 3:1 (H:V), a bottom width of 3.00 m, a Man- ning's n of 0.015, and carries a flow of 20 m³/s. The depth of flow at a gaging station is observed to be 1.00 m. Answer the following questions: (a) What is the normal depth of flow in the channel? (b) What is the critical depth of flow in the channel? (c) Classify the slope of the channel and the water sur- face profile at the gaging station.

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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4.58. A trapezoidal canal has a longitudinal slope of 1%, side
slopes of 3:1 (H:V), a bottom width of 3.00 m, a Man-
ning's n of 0.015, and carries a flow of 20 m³/s. The depth
of flow at a gaging station is observed to be 1.00 m.
Answer the following questions:
(a) What is the normal depth of flow in the channel?
(b) What is the critical depth of flow in the channel?
(c) Classify the slope of the channel and the water sur-
face profile at the gaging station.
Transcribed Image Text:4.58. A trapezoidal canal has a longitudinal slope of 1%, side slopes of 3:1 (H:V), a bottom width of 3.00 m, a Man- ning's n of 0.015, and carries a flow of 20 m³/s. The depth of flow at a gaging station is observed to be 1.00 m. Answer the following questions: (a) What is the normal depth of flow in the channel? (b) What is the critical depth of flow in the channel? (c) Classify the slope of the channel and the water sur- face profile at the gaging station.
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