freezing for periods longer than 10
more widely spaced, depending on the
days.
Capacity of the pond is based
terrain and economy of construction.
on a 30-day storage period.
Only the
Where it is possible to construct the
volume of the pond above a 2-foot
ponds at different elevations, the
depth is considered when the total
flow from one to another should be
ponding area is 5 acres or less. When
over a wide and shallow weir to permit
the ponding area is larger, only the
maximum aeration and oxidation of the
volume
above
a
3-foot
depth
is
sewage.
Where topography permits, a
considered.
For best results, three
series of weirs, usually called a
or more ponds should be used in
cascade, is used to secure maximum
series.
They
may
be
separated
aeration (fig 9).
by
narrow
dikes
or
may
be
Figure 9.
Oxidation pond.
4-12
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