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ENV
4001:
E
NVIRONMENTAL
S
YSTEMS
E
NGINEERING
Spring 2011
University of South Florida
Homework #10
Civil & Environmental Eng.
Due:
Friday, Apr. 22 –
no late assignments accepted
Prof. J.A. Cunningham
Each homework assignment will be graded on a 100point scale.
Point values for this
assignment are indicated for each question.
1.
(20 pts) Imagine that you are designing a new landfill for a population of 24,000 people.
The
area you have available is 400 m long by 200 m wide.
For reasons of slope stability, you need
to build your landfill with a slope (horizontal:vertical) of 2.6.
The maximum height of the
landfill is 15 m.
a.
(5 pts) Use equation 13.8 in your text to estimate the available volume of the landfill.
b.
(5 pts) If you ignore the volume of daily cover, how long (in years) would this landfill last?
Assume a density of compacted waste equal to 480 kg/m
3
.
(This is a relatively conservative
estimate because the weight of the waste will cause additional compaction, so after a while,
the density will actually be greater than 480 kg/m
3
.)
c.
(5 pts) Suppose that, when waste is deposited at the landfill, the width of the working face is
20 m, and the daily refuse height in a cell is 2 m.
(These are relatively small, but it is a
pretty small landfill – only 24,000 people.)
The thickness of the daily cover is 15 cm.
The
density of the compacted waste is 480 kg/m
3
as stated above.
Then, what
volume
of daily
cover is required each day?
Hint: use equation 13.9 in your text.
d.
(5 pts) Recalculate the lifetime of the landfill, this time accounting for the volume of the
daily cover.
How much time did you “lose” because of the daily cover?
2.
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