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10
be of equal power and interchangeable, each
separate set capable of dealing efficiently with a
minimum supply of 50,000 gallons per hour
(which is the present estimated dry weather
How from both the high and the low level
systems), or 1,250,000 gallons in 24 hours, and
if working with a slightly increased speed, will
deal with a somewhat larger amount, say 60 or
70,000 gallons per hour, or 1,500,000 per day.
The working of the plant would be as
follows
The normal flow of sewage would be dealt
with by the one set: when the flow increased
beyond the capacity of the one, the second set
would be brought into use, the two sets dealing
with a maximum of, say, 3,000,000 gallons per
day, or three times the dry weather flow; the
third set would be a standbye, yet at the same
time any part of this set could be used, being
interchangeable with the other two sets.
The sewage, as at present, will pass through
the existing detritus chambers, sedimentation
tanks, and storage tanks; the tank effluent passing
into sumps will be lifted by the new pumps
into a receiving take (or over a U pipe) from
which it will flow by gravitation onto the three
circular filters, each being 100ft. in diameter,
with filtering medium not less than 7ft. in depth,
the delivery of the effluent being regulated by
proper valves, and discharged on to the filters by
self-acting, revolving sprinklers. The effluent,
after passing through the filtering medium,
ventilating and draining tiles, the collecting