10 In a channel of rectangular cross section with a slope of 1 in 1000, the discharge is to be 1,4 m³/s when the channel is running full. Its depth is half as its breadth. If the channel is roughly excavated, the coefficient of discharge C is 27 in SI units, and the Chezy formula is V = C √(Rs). If the bottom and side slopes are finished smoothly, C = 81 (R = hydraulic radius, s = slope) Assuming the cost of excavation /m³ is twice the cost of smooth finishing /m² Compare the costs of the two types of channels.
10 In a channel of rectangular cross section with a slope of 1 in 1000, the discharge is to be 1,4 m³/s when the channel is running full. Its depth is half as its breadth. If the channel is roughly excavated, the coefficient of discharge C is 27 in SI units, and the Chezy formula is V = C √(Rs). If the bottom and side slopes are finished smoothly, C = 81 (R = hydraulic radius, s = slope) Assuming the cost of excavation /m³ is twice the cost of smooth finishing /m² Compare the costs of the two types of channels.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:10
In a channel of rectangular cross section with a slope of 1 in 1000, the
discharge is to be 1,4 m³/s when the channel is running full. Its depth is half
as its breadth. If the channel is roughly excavated, the coefficient of
discharge C is 27 in SI units, and the Chezy formula is V = C √(Rs). If the
bottom and side slopes are finished smoothly, C = 81 (R = hydraulic radius,
s = slope)
Assuming the cost of excavation /m³ is twice the cost of smooth finishing /m²
Compare the costs of the two types of channels.
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