Using the Kirpich time concentration of 1.46 min, assuming the watershed is in Seattle, WA, determine the intensity of the 50 year storm. Paved area, 0.7 km² C=0.9 Bare surface, 0.8 km² C=0.6 200 m S= Drain 500 m V = 1.2 m/s Figure 2.7 Map of similar rainfall characteristics (from Steel and McGhee, 1979). Area Area 3 Area Area Area 2 Area 1 Table 2.8 Intensity-Duration Constants for Various Regions* Frequency (years) Area 1 2 A- 206 Area 2 139.75 Area 3 Area 4 Area 5 Area 6 Area 7 102 70 70 68 31.9 8- 30 21 17 נו 16 14 11 5 A= 246.9 190.2 131.1 96.9 81.1 748 48 8 29 25 19 16 13 12 12 10 A 300 229.9 170 111 122 59.8 8- 36 29 23 16 17 23 13 25 A= 326.8 2598 229.9 170 129.9 155.1 66.9 8= 33 32 30 27 17 26 10 50 A= 315 350 250 187 187 1598 65 8- 28 38 27 24 25 21 8 100 A- 366.9 374.8 290 220 2402 209.8 77.2 8- 33 36 31 28 29 26 10
Using the Kirpich time concentration of 1.46 min, assuming the watershed is in Seattle, WA, determine the intensity of the 50 year storm. Paved area, 0.7 km² C=0.9 Bare surface, 0.8 km² C=0.6 200 m S= Drain 500 m V = 1.2 m/s Figure 2.7 Map of similar rainfall characteristics (from Steel and McGhee, 1979). Area Area 3 Area Area Area 2 Area 1 Table 2.8 Intensity-Duration Constants for Various Regions* Frequency (years) Area 1 2 A- 206 Area 2 139.75 Area 3 Area 4 Area 5 Area 6 Area 7 102 70 70 68 31.9 8- 30 21 17 נו 16 14 11 5 A= 246.9 190.2 131.1 96.9 81.1 748 48 8 29 25 19 16 13 12 12 10 A 300 229.9 170 111 122 59.8 8- 36 29 23 16 17 23 13 25 A= 326.8 2598 229.9 170 129.9 155.1 66.9 8= 33 32 30 27 17 26 10 50 A= 315 350 250 187 187 1598 65 8- 28 38 27 24 25 21 8 100 A- 366.9 374.8 290 220 2402 209.8 77.2 8- 33 36 31 28 29 26 10
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Using the Kirpich time concentration of 1.46 min, assuming the watershed is in Seattle,
WA, determine the intensity of the 50 year storm.
Paved area, 0.7 km²
C=0.9
Bare surface, 0.8 km²
C=0.6
200 m
S=
Drain
500 m
V = 1.2 m/s
Figure 2.7 Map of similar rainfall characteristics (from Steel and McGhee, 1979).
Area
Area 3
Area
Area
Area 2
Area 1
Table 2.8 Intensity-Duration Constants for Various Regions*
Frequency
(years)
Area 1
2 A- 206
Area 2
139.75
Area 3
Area 4
Area 5
Area 6
Area 7
102
70
70
68
31.9
8- 30
21
17
נו
16
14
11
5 A= 246.9
190.2
131.1
96.9
81.1
748
48
8 29
25
19
16
13
12
12
10 A
300
229.9
170
111
122
59.8
8- 36
29
23
16
17
23
13
25 A=
326.8
2598
229.9
170
129.9
155.1
66.9
8= 33
32
30
27
17
26
10
50 A= 315
350
250
187
187
1598
65
8- 28
38
27
24
25
21
8
100 A-
366.9
374.8
290
220
2402
209.8
77.2
8- 33
36
31
28
29
26
10
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