This can be entered in the lower
To have easier numbers to work with
invert elevation column in row 16.
297.6 will be used.
This is entered
The upper invert elevation must be at
in the upper invert elevation column.
least 2 feet 4 inches below the
Using the invert elevation gives a
slope of 10.4 percent.
are tabulated in row 16.
6. Trickling filters, used for
exercises 1 through 3 deal with the
characteristics of sewage.
should have a 5- to 8-foot deep
layer of uniformly crushed stone
1. Which type of sewage is a
for best results.
The amount of
sewage collection system primarily
stone is determined by assuming a
designed for in the TO?
requirement of how many cubic yards
2. What percentage of sewage is
normally solid matter?
sewage, what is the most common
method of effluent disposal?
(BOD) is a measure of what, when
applied to sewage?
choice exercises 8 and 9 to test your
exercises 4 through 7 provide an
8. What minimum depth of cover in
opportunity for you to show that you
feet is normally required over
understand sewage treatment.
sewer pipes to protect them against
heavy truck traffic?
4. An Imhoff tank replaces what
a. bar screen and drying bed
9. Manholes are required at the
b. drying bed and digestion tank
end of laterals and at each change
c. bar screen and settling tank
of direction, slope, or pipe size.
d. settling and digestion tanks
For sewers of less than 18-inches
digestion tanks can be dried in
specified if none of the above
The lagoons should have
how many months' storage capacity?