Q.5 A 6-acre basin in with soil type C is to be developed into 2 acres of commercial use (C = 0.95, CN = 93) and 4 acres of park (C= 0.2, CN = 74) as shown in the figure below. The time of concentrations for these areas are also shown in the figure. (a) Using the Rational Method, what is the design flow at the inlet for: i. 10-year design storm, and ii. 25-year design storm. consider two different scenarios (just commercial area with shorter c, and total area with longer tg) and pick the worst case.
Q.5 A 6-acre basin in with soil type C is to be developed into 2 acres of commercial use (C = 0.95, CN = 93) and 4 acres of park (C= 0.2, CN = 74) as shown in the figure below. The time of concentrations for these areas are also shown in the figure. (a) Using the Rational Method, what is the design flow at the inlet for: i. 10-year design storm, and ii. 25-year design storm. consider two different scenarios (just commercial area with shorter c, and total area with longer tg) and pick the worst case.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Q.5 A 6-acre basin in with soil type C is to be developed into 2 acres of commercial use (C =
0.95, CN = 93) and 4 acres of park (C = 0.2, CN = 74) as shown in the figure below. The time of
concentrations for these areas are also shown in the figure.
(a) Using the Rational Method, what is the design flow at the inlet for: i. 10-year design storm,
and ii. 25-year design storm. consider two different scenarios (just commercial area with shorter
tc, and total area with longer tc) and pick the worst case.
(b) What size storm pipe should be specified downstream of this inlet for: i. 10-year design storm
ii. 25-year design storm assume the pipe will be concrete (n=0.015) and laid on a 1.0% slope.
A = 2 ac
1 = 5 min
A = 4 ac
e = 20 min
Inlet
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