This apparatus is placed in those
sump wells which are not easily accessible, and the air lift was
selected for the reason that no moving parts are conveyed in the
air-lift construction other than the movable ball float and valve
which control the device. The air lift consists of concentric piping
extending several feet into the ground below the bottom of the well,
and the water is elevated by the air producing a rising column of
water of less specific weight than the descending column of water
which is in the pipe extending below the bottom of the sump well.
In the case of Nos. 3 and 5 sumps, and for Location No. 1, automatic
air-operated ejectors have been employed, for the reason that the
conditions did not warrant the employment of air lifts or electric or
air-operated pumps.
In the case of Nos. 6, 8, 9, and 10 sumps and for Locations Nos. 2, 4,
and 5, air-operated reciprocating pumps will be employed. These pumps
will be placed in readily accessible locations, where air lifts could
not be used, and this type of pump was selected as being the most
reliable device to employ.
In the case of Location No. 3, where provision has to be made to
prevent a large amount of yard drainage, during a storm, from entering
the tunnel where it descends from the portal, it was considered best
to employ large submerged centrifugal pumps, operated by reciprocating
air engines. Also for the portal, at Location No. 6, similar
centrifugal pumps will be employed, but as compressed air is not
available at this point, these pumps will be operated by electric
motors.
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