CE 460 Water Resources II
Dr. Bret Webb
Department of Civil, Coastal, and Environmental
Engineering
Module 6, Example 1: UH Conversion
Example 1. UH Conversion
Problem Statement
Time (hr)
U (cfs)
The 1-hr UH in the
accompanying table was
recorded for a particular
watershed. Determine the size of
the watershed in acres and then
convert the 1-hr UH into a 3-hr UH
for the same watershed.
0
0
1
7
2
23
3
44
4
75
5
60
6
50
7
30
8
15
9
5
10
0
2
Example 1. UH Conversion
Problem Solution
Time (hr)
U (cfs)
Vol (cfs-hrs)
Determine the size of the
watershed in acres.
0
0
0
1
7
2
23
3
44
4
75
5
60
6
50
7
30
8
15
9
5
10
0
3
0
Example 1. UH Conversion
Problem Solution
Time (hr)
U (cfs)
Vol (cfs-hrs)
Determine the size of the
watershed in acres.
0
0
0
1
7
2
23
3
44
4
75
5
60
6
50
7
30
8
15
9
5
10
0
4
0
Example 1. UH Conversion
Problem Solution
Convert the 1-hr UH into a 3-hr
UH for the same watershed.
5
Time
(hr)
U (cfs)
U1
(cfs)
0
0
0
1
7
7
2
23
23
3
44
44
4
75
75
5
60
60
6
50
50
7
30
30
8
15
15
9
5
5
10
0
0
U2
(cfs)
U3
(cfs)
3-hr
UH
(cfs)
Example 1. UH Conversion
Problem Solution
Convert the 1-hr UH into a 3-hr
UH for the same watershed.
6
Time
(hr)
U (cfs)
U1
(cfs)
0
0
0
1
7
7
0
2
23
23
7
0
10
3
44
44
23
7
24.67
4
75
75
44
23
47.3
5
60
60
75
44
59.67
6
50
50
60
75
61.67
7
30
30
50
60
46.67
8
15
15
30
50
31.67
9
5
5
15
30
16.67
10
0
0
5
15
6.67
0
5
1.67
0
0
11
12
U2
(cfs)
U3
(cfs)
3-hr
UH
(cfs)
0
2.3
Need Assistance?
Email:
bwebb@southalabama.edu
Phone:
(251) 460-7507
Office Hours:
See syllabus for office hours or set up an appointment with an instructor via email
Website:
Post questions/comments/concerns under Discussions / Module 6.
7