Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 16, Problem 6P
To determine
(a)
The definition of drainage area.
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Question 1: You have been assigned to design primary clarifiers for a wastewater treatment plant. The average flow rate of the wastewater is 256000 m3/day with a BOD5 of 120 mg/L and suspended solids concentration of 300 mg/L. The goal is to remove 35% BOD5 and 60% suspended solids in primary treatment. Determine the following: 1) The diameter of the primary clarifier for a surface overflow rate of 50 m3/m2-day.2) The detention time in the primary clarifier and the mass of solids removed in kg/day.Assume a depth of 4m.
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
minutes respectively. Discuss.
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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