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A 3 hour unit hydrograph is parabolic in shape. The discharge rises from 0 to 72 in 6 hours and then falls to zero in next 6 hours. An average rainfall of 8 cm occurs during a period of 6 hours with uniform intensity over a catchment having index = 0.5 cm/hr. What is the peak discharge of resulting direct runoff hydrograph.
  • a)
    720
  • b)
    144
  • c)
    337.5
  • d)
    360
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A 3 hour unit hydrograph is parabolic in shape. The discharge rises fr...
Equation of parabola is given by:

Equation of 6 hour unit hydrograph is obtained by lagging the unit hydrograph by 3hour ,Hence; equation of 6 hour unit hydrograph becomes:

2 (x-6) + 2(x-9) = 0
x – 6 + x – 9 = 0
x = 7.5
Hence, peak discharge is given at 7.5 hours
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A 3 hour unit hydrograph is parabolic in shape. The discharge rises from 0 to 72 in 6 hours and then falls to zero in next 6 hours. An average rainfall of 8 cm occurs during a period of 6 hours with uniform intensity over a catchment having index = 0.5 cm/hr. What is the peak discharge of resulting direct runoff hydrograph. a) 720 b) 144 c) 337.5 d) 360 Correct answer is option 'C'. Can you explain this answer?
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A 3 hour unit hydrograph is parabolic in shape. The discharge rises from 0 to 72 in 6 hours and then falls to zero in next 6 hours. An average rainfall of 8 cm occurs during a period of 6 hours with uniform intensity over a catchment having index = 0.5 cm/hr. What is the peak discharge of resulting direct runoff hydrograph. a) 720 b) 144 c) 337.5 d) 360 Correct answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A 3 hour unit hydrograph is parabolic in shape. The discharge rises from 0 to 72 in 6 hours and then falls to zero in next 6 hours. An average rainfall of 8 cm occurs during a period of 6 hours with uniform intensity over a catchment having index = 0.5 cm/hr. What is the peak discharge of resulting direct runoff hydrograph. a) 720 b) 144 c) 337.5 d) 360 Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 3 hour unit hydrograph is parabolic in shape. The discharge rises from 0 to 72 in 6 hours and then falls to zero in next 6 hours. An average rainfall of 8 cm occurs during a period of 6 hours with uniform intensity over a catchment having index = 0.5 cm/hr. What is the peak discharge of resulting direct runoff hydrograph. a) 720 b) 144 c) 337.5 d) 360 Correct answer is option 'C'. Can you explain this answer?.
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