Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 16, Problem 6P
To determine
(a)
The definition of drainage area.
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Pipe Sizing and Runoff
A development has a runoff coefficient of 0.4, a drainage area of 45 acres, and a 25-year intensity of 1.9
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Find the peak flow rate using the rational method and size a circular pipe to convey the 25-year flow rate.
QUESTION 1: Answer the following questions. Draw sketches where needed.
a)
Explain the functions of manholes in sewage systems.
b)
What types of sewage systems are used? Explain.
c)
Explain the runoff coefficient.
d)
Explain the inlet time, flow time and concentration time in storm water systems.
e)
Determine the hydrographs when the flow time is 5 minutes and rainfall durations are 3, 5, and 7
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QUESTION 2: The layout of the storm water collection system is given below with areas that served by
each channel, run-off coefficients, inlet times for starting manholes and flow times for channels.
Determine the discharges of all channels for the design rainfall of n=2 and T=15min. (Rainfall yield r= lab
I/s.ha is for the rainfall of n=1 and T=15 min.)
t; =15min
(4)
A=4,a ha.
A=2,b ha.
A=3,a ha.
A=1,b ha.
C=0.45
t; =5min
t=10min
C=0.60
C=0.75
C=0.60
(1) t;=6min
(2)
t=4min
(3) tę =3min (5)
A=2,b ha
C=0.50
te =3min
Design a pond for treating leachate from a
sanitary landfill having an area of 5000 square
meters if the runoff coefficient is 0.40 and
effective rainfall is 60 mm/hr. The receiving body
of water is Class B. Assume appropriate design
data.
Chapter 16 Solutions
Traffic and Highway Engineering
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