Given: the IDF-curve shown in the Figure below, answer the following questions: a) Intensity for 10-year storm lasting 40 minutes. b) What is the return period for a rainfall intensity of 4 in/hr and duration of 50 minutes? c) What is the probability of a rainfall event of 3 in/hr and 30 minutes duration? d) What is the total rainfall depth for the storm in part a? e) How many times a rainfall intensity of 2 in/hr that lasts for 50 minutes will be equaled or exceeded in 50 years? f) what return period (years) must an engineer use it the design of a bridge opening if it is acceptable to have only a 19% risk that flooding will occur at least once in two consecutive years?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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Rainfail Intensity (in./hr)
10
2
0
20
100-yr frequency
50-yr frequency
-20-yr frequency
40
10-yr frequency
5-yr frequency
60
Duration (min)
80
100
120
Transcribed Image Text:Rainfail Intensity (in./hr) 10 2 0 20 100-yr frequency 50-yr frequency -20-yr frequency 40 10-yr frequency 5-yr frequency 60 Duration (min) 80 100 120
Given: the IDF-curve shown in the Figure below, answer the following questions:
a) Intensity for 10-year storm lasting 40 minutes.
b) What is the return period for a rainfall intensity of 4 in/hr and duration of 50 minutes?
c) What is the probability of a rainfall event of 3 in/hr and 30 minutes duration?
d) What is the total rainfall depth for the storm in part a?
e) How many times a rainfall intensity of 2 in/hr that lasts for 50 minutes will be equaled or
exceeded in 50 years?
f)
what return period (years) must an engineer use it the design of a bridge opening if it is
acceptable to have only a 19 % risk that flooding will occur at least once in two consecutive
years?
Transcribed Image Text:Given: the IDF-curve shown in the Figure below, answer the following questions: a) Intensity for 10-year storm lasting 40 minutes. b) What is the return period for a rainfall intensity of 4 in/hr and duration of 50 minutes? c) What is the probability of a rainfall event of 3 in/hr and 30 minutes duration? d) What is the total rainfall depth for the storm in part a? e) How many times a rainfall intensity of 2 in/hr that lasts for 50 minutes will be equaled or exceeded in 50 years? f) what return period (years) must an engineer use it the design of a bridge opening if it is acceptable to have only a 19 % risk that flooding will occur at least once in two consecutive years?
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