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.

Structural Analysis
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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
Transcribed Image Text:Civil Engineering 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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