The ordinates of a 6h-UH are given: A storm has three successive 6-h intervals of rainfall magnitude of 3.0, 5.0, and 4.0 cm, respectively. Assuming a φ-index of 0.20 cm/hr and a base flow of 30m3/s, determine the plot of the resulting hydrograph of flow. Hint: Note that the storms follow a certain sequence: The 3cm rain is followed by the 5cm rain and then the 4cm rain, all of which are 6 hours in duration. The ordinates of the 5-cm DRH are lagged by 6 hours and the 4-cm DRH is lagged by 12 hrs. Using the method of superposition, the ordinates of the resulting 12cm hydrograph is obtained by combining the ordinates of the 3 DRHs.
The ordinates of a 6h-UH are given: A storm has three successive 6-h intervals of rainfall magnitude of 3.0, 5.0, and 4.0 cm, respectively. Assuming a φ-index of 0.20 cm/hr and a base flow of 30m3/s, determine the plot of the resulting hydrograph of flow. Hint: Note that the storms follow a certain sequence: The 3cm rain is followed by the 5cm rain and then the 4cm rain, all of which are 6 hours in duration. The ordinates of the 5-cm DRH are lagged by 6 hours and the 4-cm DRH is lagged by 12 hrs. Using the method of superposition, the ordinates of the resulting 12cm hydrograph is obtained by combining the ordinates of the 3 DRHs.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The ordinates of a 6h-UH are given:
A storm has three successive 6-h intervals of rainfall magnitude of 3.0, 5.0, and 4.0 cm, respectively. Assuming a φ-index of 0.20 cm/hr and a base flow of 30m3/s, determine the plot of the resulting hydrograph of flow.
Hint: Note that the storms follow a certain sequence: The 3cm rain is followed by the 5cm rain and then the 4cm rain, all of which are 6 hours in duration. The ordinates of the 5-cm DRH are lagged by 6 hours and the 4-cm DRH is lagged by 12 hrs. Using the method of superposition, the ordinates of the resulting 12cm hydrograph is obtained by combining the ordinates of the 3 DRHs.
Transcribed Image Text:Time (h)
6-h UH
ordinates (m³/s)
3
150
250
450
12
600
18
800
24
700
30
600
36
450
42
320
48
200
54
100
60
50
66
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