Problem 2. A storm had 3 successive 6-hr intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively. Time from the beginning 0 3 6 9 12 18 24 30 36 48 54 60 66 42 of the storm (hr) 6-hr UH ordinates (cumecs) 0 150 250 450 600 800 700 600 450 320 200 100 50 0 a. Plot the resulting DRH due to 3 rainfall events, assuming a phi-index of 0.20 cm/hr. • Recall that the phi-index represents the rate of infiltration. • The hydrograph plots RUNOFF rates, where runoff = precipitation - losses. Note that the rainfall magnitude is reported as total rainfall depth in 6 hrs, so convert infiltration as a total for every 6 hr period. b. Assuming a baseflow of 30 m3/s, what are the ordinates of the storm hydrograph?

Structural Analysis
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Chapter2: Loads On Structures
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Problem 2. A storm had 3 successive 6-hr intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively.
Time from
the
beginning
0 3
6
9
12
18
24
30
36
48
54
60 66
42
of the
storm (hr)
6-hr UH
ordinates
(cumecs)
0 150 250 450 600 800 700 600 450 320
200 100 50 0
a. Plot the resulting DRH due to 3 rainfall events, assuming a phi-index of 0.20 cm/hr.
• Recall that the phi-index represents the rate of infiltration.
• The hydrograph plots RUNOFF rates, where runoff = precipitation - losses.
Note that the rainfall magnitude is reported as total rainfall depth in 6 hrs, so convert infiltration as a total for every 6 hr period.
b. Assuming a baseflow of 30 m3/s, what are the ordinates of the storm hydrograph?
Transcribed Image Text:Problem 2. A storm had 3 successive 6-hr intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively. Time from the beginning 0 3 6 9 12 18 24 30 36 48 54 60 66 42 of the storm (hr) 6-hr UH ordinates (cumecs) 0 150 250 450 600 800 700 600 450 320 200 100 50 0 a. Plot the resulting DRH due to 3 rainfall events, assuming a phi-index of 0.20 cm/hr. • Recall that the phi-index represents the rate of infiltration. • The hydrograph plots RUNOFF rates, where runoff = precipitation - losses. Note that the rainfall magnitude is reported as total rainfall depth in 6 hrs, so convert infiltration as a total for every 6 hr period. b. Assuming a baseflow of 30 m3/s, what are the ordinates of the storm hydrograph?
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