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 20 years, calculate the probability (%) of failure of the leveeduring its design life period.Area 1A1A2Area 2C1Table 2-1: Sub-catchment propertiestiCatchment propertyArea 1Area 2| Area 3Catchment area ( km²)1020Area 3A3Runoff coefficient0.20.90.4C3Time of concentration (minutes)201020t3Catchment outletFigure 2-1: WatershedIDF curves for storms in vicinity of example site9508 25871아54321-105 10 15 203040506070 8090 100 110 120 130Time (min)Intensity of rainfall (in./hr)

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(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 20 years, calculate the probability (%) of failure of the levee during its design life period. Area A2 Area 1 Ci A1 C2 Table 2-1: Sub-catchment properties t2 Catchment property Area 1 Area 2 Area 3 Catchment area ( km²) 10 20 Area 3 A3 Runoff coefficient 0.2 0.9 0.4 C3 Time of concentration (minutes) 20 10 20 t3 Catchment outlet Figure 2-1: Watershed IDF curves for storms in vicinity of example site 9. 8. 8. 6. 4 2- 1. 0 5 10 15 20 30 40 50 60 70 80 90 100 110 120 130 Time (min) Intensity of rainfall (in./hr)

(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 20 years, calculate the probability (%) of failure of the levee during its design life period. Area A2 Area 1 Ci A1 C2 Table 2-1: Sub-catchment properties t2 Catchment property Area 1 Area 2 Area 3 Catchment area ( km²) 10 20 Area 3 A3 Runoff coefficient 0.2 0.9 0.4 C3 Time of concentration (minutes) 20 10 20 t3 Catchment outlet Figure 2-1: Watershed IDF curves for storms in vicinity of example site 9. 8. 8. 6. 4 2- 1. 0 5 10 15 20 30 40 50 60 70 80 90 100 110 120 130 Time (min) Intensity of rainfall (in./hr)

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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Concepts of Flood Control

Flooding is a temporary overflow of water that submerges or covers the the usually dry land. It can also be defined as the overflow of the excess amount of water that covers a huge area of land which is normally dry.

Question

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 20 years, calculate the probability (%) of failure of the levee
during its design life period.
Area 1
A1
A2
Area 2
C1
Table 2-1: Sub-catchment properties
ti
Catchment property
Area 1
Area 2| Area 3
Catchment area ( km²)
10
20
Area 3
A3
Runoff coefficient
0.2
0.9
0.4
C3
Time of concentration (minutes)
20
10
20
t3
Catchment outlet
Figure 2-1: Watershed
IDF curves for storms in vicinity of example site
9
50
8 25
8
7
1아
5
4
3
2
1-
1
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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