Watershed shown in the Figure 2-1 has three sub-catchment areas. Some properties of these sub-catchment areas are given in Table 2-1.(a) Using the given IDF curves and the Rational method, calculate the 50-years design peak flow (incfs) at the catchment outlet.(b) A levee is to be designed to protect the area near to the catchment outlet using the estimated peak-flow. If the design life of the levee is 15 years, calculate the probability (%) of failure of the leveeduring its design life period.Area 1A1A2Area 2C1C2Table 2-1: Sub-catchment propertiestit2Catchment propertyArea 1Area 2Area 3Catchment area ( km²)10520Area 3АзRunoff coefficient0.250.750.5C3Time of concentration (minutes)302030t3Catchment outletFigure 2-1: WatershedIDF curves for storms in vicinity of example site99876.42+21t05 10 15 203040 5060708090 100 110 120 130Time (min)Intensity of rainfall (in./hr)

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Answered: (a) Using the given IDF curves and the…

(a) Using the given IDF curves and the Rational method, calculate the 50-years design peak flow (in cfs) at the catchment outlet.

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Watershed shown in the Figure 2-1 has three sub-catchment areas. Some properties of these sub-
catchment areas are given in Table 2-1.
(a) Using the given IDF curves and the Rational method, calculate the 50-years design peak flow (in
cfs) at the catchment outlet.
(b) A levee is to be designed to protect the area near to the catchment outlet using the estimated peak-
flow. If the design life of the levee is 15 years, calculate the probability (%) of failure of the levee
during its design life period.
Area 1
A1
A2
Area 2
C1
C2
Table 2-1: Sub-catchment properties
ti
t2
Catchment property
Area 1
Area 2
Area 3
Catchment area ( km²)
10
5
20
Area 3
Аз
Runoff coefficient
0.25
0.75
0.5
C3
Time of concentration (minutes)
30
20
30
t3
Catchment outlet
Figure 2-1: Watershed
IDF curves for storms in vicinity of example site
9
9
8
7
6.
4
2+
2
1t
05 10 15 20
30
40 50
60
70
80
90 100 110 120 130
Time (min)
Intensity of rainfall (in./hr)

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