4) Given the layout of the 30-acre basin below, what is the travel time in pipe 1 (n = 0.012) in minutes for a 5-year return period, if the length of pipe 1 is 200 ft and an average surface slope of 0.376%? Assume a C value of 0.4 for pervious areas and a C value of 0.9 for impervious areas and use a realistic pipe dimension (15", 18", 21", 24", 27", 30", 33", 36"). a) 0.1 c) 0.8 Area = 3 h Area = 1 Area = 2 Area = 4 Area ID Area [acres] t. [minutes] % imperv. 1 3 8 40 2 9 3 4 3 15 Rainfall intensities in [in/hr] Duration [minutes] 5 6 7 8 9 10 11 b) 45.7 d) 0.6 5 5 8 80 60 60 Average recurrence interval 1-yr 2-yr 5-yr 10-yr 4.7 5.6 7.0 8.3 4.4 5.2 6.5 7.6 4.8 6.1 7.1 3.8 4.6 5.7 6.7 3.6 4.3 5.4 6.4 3.5 4.1 5.2 6.1 3.3 3.9 4.9 5.8
4) Given the layout of the 30-acre basin below, what is the travel time in pipe 1 (n = 0.012) in minutes for a 5-year return period, if the length of pipe 1 is 200 ft and an average surface slope of 0.376%? Assume a C value of 0.4 for pervious areas and a C value of 0.9 for impervious areas and use a realistic pipe dimension (15", 18", 21", 24", 27", 30", 33", 36"). a) 0.1 c) 0.8 Area = 3 h Area = 1 Area = 2 Area = 4 Area ID Area [acres] t. [minutes] % imperv. 1 3 8 40 2 9 3 4 3 15 Rainfall intensities in [in/hr] Duration [minutes] 5 6 7 8 9 10 11 b) 45.7 d) 0.6 5 5 8 80 60 60 Average recurrence interval 1-yr 2-yr 5-yr 10-yr 4.7 5.6 7.0 8.3 4.4 5.2 6.5 7.6 4.8 6.1 7.1 3.8 4.6 5.7 6.7 3.6 4.3 5.4 6.4 3.5 4.1 5.2 6.1 3.3 3.9 4.9 5.8
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
The correct answer is (C) - 0.8
![4) Given the layout of the 30-acre basin below, what is the travel time in pipe 1 (n =
0.012) in minutes for a 5-year return period, if the length of pipe 1 is 200 ft and an
average surface slope of 0.376%? Assume a C value of 0.4 for pervious areas and a C
value of 0.9 for impervious areas and use a realistic pipe dimension (15", 18", 21",
24", 27", 30", 33", 36").
a) 0.1
c) 0.8
Area = 3
O
P₂
Area = 1
Area = 2
Area = 4
Area ID
1
2
3
4
Rainfall intensities
in [in/hr]
5
6
7
8
9
Area [acres] t. [minutes]
8
5
5
8
Duration
[minutes]
10
3
9
3
15
11
b) 45.7
d) 0.6
Average recurrence interval
1-yr 2-yr 5-yr 10-yr
4.7
5.6
91
% imperv.
40
80
60
60
7.0 8.3
5.2 6.5
TR
7.6
7.1
4.1
4.8 6.1
3.8 4.6 5.7 6.7
3.6 4.3 5.4 6.4
3.5
4.1 5.2
6.1
5.8
3.3 3.9 4.9](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdf5aa2e5-f0b0-4839-a4ef-6f98d6dc8551%2F3b5f0679-f872-4497-9d7f-09a0ef5d4384%2Foreaxff_processed.png&w=3840&q=75)
Transcribed Image Text:4) Given the layout of the 30-acre basin below, what is the travel time in pipe 1 (n =
0.012) in minutes for a 5-year return period, if the length of pipe 1 is 200 ft and an
average surface slope of 0.376%? Assume a C value of 0.4 for pervious areas and a C
value of 0.9 for impervious areas and use a realistic pipe dimension (15", 18", 21",
24", 27", 30", 33", 36").
a) 0.1
c) 0.8
Area = 3
O
P₂
Area = 1
Area = 2
Area = 4
Area ID
1
2
3
4
Rainfall intensities
in [in/hr]
5
6
7
8
9
Area [acres] t. [minutes]
8
5
5
8
Duration
[minutes]
10
3
9
3
15
11
b) 45.7
d) 0.6
Average recurrence interval
1-yr 2-yr 5-yr 10-yr
4.7
5.6
91
% imperv.
40
80
60
60
7.0 8.3
5.2 6.5
TR
7.6
7.1
4.1
4.8 6.1
3.8 4.6 5.7 6.7
3.6 4.3 5.4 6.4
3.5
4.1 5.2
6.1
5.8
3.3 3.9 4.9
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