a. Using Rational Formula, calculate the 50-year peak discharge for the whole watershed (as one basin). b. Assuming CNs of 87, 81, and 78 for subareas 1, 2, and 3, respectively, estimate the 50-year, 1-hr. peak discharges for each inlet using the SCS Graphical Method c. Graphically estimate the total peak discharge (simplify using triangular curve shape).
a. Using Rational Formula, calculate the 50-year peak discharge for the whole watershed (as one basin). b. Assuming CNs of 87, 81, and 78 for subareas 1, 2, and 3, respectively, estimate the 50-year, 1-hr. peak discharges for each inlet using the SCS Graphical Method c. Graphically estimate the total peak discharge (simplify using triangular curve shape).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![1- Choose a 2-digit fraction larger than 0.50 (i.e. 0.68) as a multiplier for the areas
2- Choose a storm frequency between 2-50 years
Answer All Questions
1- For the watershed shown below and the IDF curve.,
a. Using Rational Formula, calculate the 50-year peak discharge for the
whole watershed (as one basin).
b. Assuming CNs of 87, 81, and 78 for subareas 1, 2, and 3, respectively,
estimate the 50-year, 1-hr. peak discharges for each inlet using the SCS
Graphical Method
c. Graphically estimate the total peak discharge (simplify using triangular
curve shape).
d. Repeat the calculation of b and c using Snyder UH method. Assume flow
length of 600 feet, 400 feet, and 550 feet for subareas 1m 2, and 3,
respectively. Assume that the Center Flow Length, Lc, for the subareas is
equal to one half of the flow length.
A₁ = 2.8 ac
C₁ = 0.6
tc1
= 5 min
Inlet
Pipe
L = 480 ft
V = 2 ft/sec
A₂ = 3.2 ac
C₂ = 0.5
tc2
= 6 min
Inlet
A3 = 4.1 ac
C3 = 0.45
Tc3
Inlet
= 7 min](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F000815f0-84c8-4f4b-be5f-e80ebad381dd%2Fbcb2dc09-d309-413d-885c-322996df9631%2F0aflpeg_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1- Choose a 2-digit fraction larger than 0.50 (i.e. 0.68) as a multiplier for the areas
2- Choose a storm frequency between 2-50 years
Answer All Questions
1- For the watershed shown below and the IDF curve.,
a. Using Rational Formula, calculate the 50-year peak discharge for the
whole watershed (as one basin).
b. Assuming CNs of 87, 81, and 78 for subareas 1, 2, and 3, respectively,
estimate the 50-year, 1-hr. peak discharges for each inlet using the SCS
Graphical Method
c. Graphically estimate the total peak discharge (simplify using triangular
curve shape).
d. Repeat the calculation of b and c using Snyder UH method. Assume flow
length of 600 feet, 400 feet, and 550 feet for subareas 1m 2, and 3,
respectively. Assume that the Center Flow Length, Lc, for the subareas is
equal to one half of the flow length.
A₁ = 2.8 ac
C₁ = 0.6
tc1
= 5 min
Inlet
Pipe
L = 480 ft
V = 2 ft/sec
A₂ = 3.2 ac
C₂ = 0.5
tc2
= 6 min
Inlet
A3 = 4.1 ac
C3 = 0.45
Tc3
Inlet
= 7 min
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