A 4-hour storm occurs over an 80 km² watershed. The details of the catchment are as follows. Sub Area (km²) 15. Index (mm/hour) 10 1st hour 16 Hourly Rain (mm) 2nd hour 3rd hour 48 22 4th hour 10

Structural Analysis
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Chapter2: Loads On Structures
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Example-1
A 4-hour storm occurs over an 80 km² watershed. The details of the catchment are as
follows.
Sub Area
(km²)
15
25
35
5
Index
(mm/hour)
10
15
21
16
1st hour
16
16
12
15
Hourly Rain (mm)
2nd hour
48
42
40
42
3rd hour
22
20
18
18
4th hour
10
Calculate the runoff from the catchment and the hourly distribution of the effective
rainfall for the whole catchment.
Transcribed Image Text:Example-1 A 4-hour storm occurs over an 80 km² watershed. The details of the catchment are as follows. Sub Area (km²) 15 25 35 5 Index (mm/hour) 10 15 21 16 1st hour 16 16 12 15 Hourly Rain (mm) 2nd hour 48 42 40 42 3rd hour 22 20 18 18 4th hour 10 Calculate the runoff from the catchment and the hourly distribution of the effective rainfall for the whole catchment.
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