(a) A flood drainage channel has to be designed to carry runoff from 200 km² area. If the flow per square kilometer is 0.5 m³/s/km², determine the flood drainage channel size using (i) the permissible velocity method, and (ii) tractive force method. The material size is 2 mm and So=0.00002. Provide sufficien justification for assumptions and/or judgement used in your procedure. State clearly the design steps usec in the design process. om of a 30-m-wide spillway for a flow of 800 m³/s is at El. 250 m and
(a) A flood drainage channel has to be designed to carry runoff from 200 km² area. If the flow per square kilometer is 0.5 m³/s/km², determine the flood drainage channel size using (i) the permissible velocity method, and (ii) tractive force method. The material size is 2 mm and So=0.00002. Provide sufficien justification for assumptions and/or judgement used in your procedure. State clearly the design steps usec in the design process. om of a 30-m-wide spillway for a flow of 800 m³/s is at El. 250 m and
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:(a) A flood drainage channel has to be designed to carry runoff from 200 km² area. If the flow per square
kilometer is 0.5 m³/s/km², determine the flood drainage channel size using (i) the permissible velocity
method, and (ii) tractive force method. The material size is 2 mm and S,=0.00002. Provide sufficient
justification for assumptions and/or judgement used in your procedure. State clearly the design steps used
in the design process.
(b) The reservoir level upstream of a 30-m-wide spillway for a flow of 800 m³/s is at El. 250 m and
downstream river level channel for this design flow is at El. 150 m. If the stilling basin width is the same
as that of the spillway, compute the floor level of the stilling basin so that the jump is formed in the basin.
Assume the losses in the spillway are negligible. What would be the basin invert level if one can use an
end sill or one row of baffle blocks and an end sill?
(c) A mountain creek with a flow rate of 100 ft/s passes through an eight-ft diameter circular culvert laid
at a bottom slope of 1 ft./mile. Determine the critical depth of flow in the culvert.
in on
OC
channel
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