A small watershed has an area of 3 km². The slope of the catchment is 1/150 and the maximum length of travel of water is 2 km. The maximum depth of rainfall with a 30 year return period is given in the following table: Duration (min) 10 15 20 25 30 40 50 60 Depth of rainfall (cm) 3.2 3.8 4.6 6.0 6.5 7.2 8.5 8.7 9.4
A small watershed has an area of 3 km². The slope of the catchment is 1/150 and the maximum length of travel of water is 2 km. The maximum depth of rainfall with a 30 year return period is given in the following table: Duration (min) 10 15 20 25 30 40 50 60 Depth of rainfall (cm) 3.2 3.8 4.6 6.0 6.5 7.2 8.5 8.7 9.4
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Determine the peak flow rate for a return period of 30 years if the average run off coefficient for the watershed is 0.30.
Transcribed Image Text:A small watershed has an area of 3 km². The slope of the catchment is 1/150 and the
maximum length of travel of water is 2 km. The maximum depth of rainfall with a 30 year
return period is given in the following table:
Duration (min)
5 10 15 20 25 30
Depth of rainfall (cm) 3.2 3.8 4.6 6.0 6.5 7.2
40
050 60
8.5 8.7 9.4
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