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.

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.

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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Question

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 = 7 min
Inlet

Rainfall Intensity (in./hr)
20.0
15.0
10.0
8.0
6.0
4.0
2.0
1.0
0.8
0.6
0.4
0.2
0.1
0.08
0.06
0.04
0.02
5
Baltimore, Maryland
1903-1951
10 15 20 30 40 5060
Minutes
NOTE
Frequency Analysis by Method of
Extreme Value after Gumbel
Return period (years)
100
50
2
DURATION
25
10
2.
3 4 5 6 8 10 12 18 24
Hours
Figure 4.4 Rainfall intensity-duration-frequency (National Weather Service, 1961).

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