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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).

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
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
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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