Problem 4.3 (page 173): The 50-year IDF curve for a 125 km? catchment located in Midwest is defined 485 as a Steel Formula of ¡ = where i is the average rainfall intensity in mm hr-l; and t is the (t + 4.5)0 duration in min. Use a computational time step of 1 hr to develop a 50-year 24-hr synthetic design storm for the catchment using the methods of: (1) Balanced triangular distribution (2) 24-hr NRCS rainfall distribution
Problem 4.3 (page 173): The 50-year IDF curve for a 125 km? catchment located in Midwest is defined 485 as a Steel Formula of ¡ = where i is the average rainfall intensity in mm hr-l; and t is the (t + 4.5)0 duration in min. Use a computational time step of 1 hr to develop a 50-year 24-hr synthetic design storm for the catchment using the methods of: (1) Balanced triangular distribution (2) 24-hr NRCS rainfall distribution
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Recorded rainfall depths (in mm).
5 min
Year
10 min
15 min
30 min
45 min
1982
2.6
3.5
4.3
5.2
8.4
1983
5.1
7.7
8.5
14.7
28.2
1984
2.9
5.1
6.6
7.4
10.2
1985
3.2
5.1
5.4
16.1
23.9
1986
2.2
3.2
3.0
10.1
17.1
1987
9.6
10.9
12.0
23.4
29.3
1988
3.8
6.4
6.8
8.3
10.0
1989
8.0
9.0
12.1
22.4
33.1
1990
3.5
5.4
6.8
7.2
10.4
1991
5.1
7.7
7.7
24.8
35.0
1992
2.9
5.4
8.1
13.2
18.5
1993
4.2
6.7
6.8
20.1
20.5
1994
8.0
9.0
12.0
16.2
21.6
1995
2.2
4.5
5.0
8.4
13.4
1996
4.2
6.1
9.2
10.0
13.4
1997
3.5
4.2
5.1
11.2
13.6
1998
3.2
4.5
6.9
15.2
21.9
1999
4.8
7.0
7.1
15.8
24.2
2000
4.5
7.0
8.4
17.5
20.2
2001
3.8
5.8
6.2
12.9
17.5
2002
2.9
4.5
5.9
6.3
8.3
2003
4.5
6.7
9.0
15.4
17.6
2004
3.2
4.5
7.6
7.9
10.7
2005
7.0
13.1
18.0
25.0
39.3
2006
2.6
4.2
6.6
8.1
12.4
2007
2.9
4.8
6.7
10.6
18.0
2008
3.2
5.4
8.3
11.4
22.0
2009
5.4
7.7
10.4
16.9
28.2
2010
2.6
3.8
4.7
10.0
13.6
2011
4.8
5.8
7.7
8,3
13.7
2012
5.8
7.7
8.3
18.3
24.5
2013
4.2
8.6
9.5
25.5
35.1
2014
5.8
7.7
9.0
16.3
27.1
2015
4.5
5.8
6.0
17.0
32.4
2016
2.6
3.5
4.1
10.9
11.2
2017
1.6
3.2
3.2
8.7
9.6
Transcribed Image Text:. Problem 4.3 (page 173): The 50-year IDF curve for a 125 km? catchment located in Midwest is defined
485
as a Steel Formula of ¡ =
where i is the average rainfall intensity in mm hr-'; and t is the
(t + 4.5)*
duration in min. Use a computational time step of 1 hr to develop a 50-year 24-hr synthetic design storm
for the catchment using the methods of:
(1) Balanced triangular distribution
(2) 24-hr NRCS rainfall distribution
100 - e0n IDE
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