2- A small watershed consists of 1.5 km² of cultivated area (c = 0.2), 2.5 km² under forest (c = 0.2) and 1.0 km² under grass cover (c = 0.35). There is a fall of 20 m in a watercourse of length 2.5 km. Intensity-Duration-Frequency The relation for the area is given by In this equation: I: rainfall intensity (mm/hr) 1 = 8070.2 (t + 11) ⁰.5 T: the return period (years) T: rainfall duration (hr) Estimate the peak rate of runoff for a 25-year, 50-year, and 100-year frequency.
2- A small watershed consists of 1.5 km² of cultivated area (c = 0.2), 2.5 km² under forest (c = 0.2) and 1.0 km² under grass cover (c = 0.35). There is a fall of 20 m in a watercourse of length 2.5 km. Intensity-Duration-Frequency The relation for the area is given by In this equation: I: rainfall intensity (mm/hr) 1 = 8070.2 (t + 11) ⁰.5 T: the return period (years) T: rainfall duration (hr) Estimate the peak rate of runoff for a 25-year, 50-year, and 100-year frequency.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
![2- A small watershed consists of 1.5 km² of cultivated area (c = 0.2), 2.5 km² under forest (c = 0.2)
and 1.0 km² under grass cover (c=0.35). There is a fall of 20 m in a watercourse of length 2.5 km.
Intensity-Duration-Frequency
The
relation for the area is given by
8070.2
(t+11) 0.5
1 =
In this equation:
I: rainfall intensity (mm/hr)
T: the return period (years)
T: rainfall duration (hr)
Estimate the peak rate of runoff for a 25-year, 50-year, and 100-year frequency.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6ffa4746-1ca4-4c0b-9ce9-baa86d5ab741%2Fdcfe3f79-b14a-436f-8b18-772b3a53778f%2Fhti0fgi_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2- A small watershed consists of 1.5 km² of cultivated area (c = 0.2), 2.5 km² under forest (c = 0.2)
and 1.0 km² under grass cover (c=0.35). There is a fall of 20 m in a watercourse of length 2.5 km.
Intensity-Duration-Frequency
The
relation for the area is given by
8070.2
(t+11) 0.5
1 =
In this equation:
I: rainfall intensity (mm/hr)
T: the return period (years)
T: rainfall duration (hr)
Estimate the peak rate of runoff for a 25-year, 50-year, and 100-year frequency.
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