A Flota-filter enables water to be drawn from near the
surface of the dam and delivered through the main pipeline. The upper
layers of water are more suitable for stock and domestic requirements.
Between irrigations, the water trapped in the main
pipeline tends to become stale and soon develops an offensive odour.
This stale water is quickly flushed away when the Lockpipe is turned on
for irrigation. However, for stock or domestic requirements the water
is drawn off relatively slowly. Consequently water in the main Lockpipe
soon becomes unsuitable for stock.
The Flota-filter System delivers water through a second,
pipeline running inside the main pipeline. The stale water in the
lockpipe system remains isolated. The smaller pipeline extends beyond
the cone strainer up into the pond area of the dam. Its inlet is fitted
with a filter attached by rope or chain to a float. The Flota-filter
draws cool fresh water from a metre or so below the surface of the dam.
The actual depth is controlled by the length of the rope or chain.
The discharge end of the Flota-filter pipeline is
attached to a socketed elbow fitting that passes through the wall of
the main lockpipe just before the valve. On the outside end of this
socket is fitted a suitable valve. The pipeline to stock or domestic
outlets may be connected to this valve.
The Flota-filter pipeline is usually about 50 mm in
diameter. The section of the Flota-filter pipeline that passes through
the Lockpipe must be relatively rigid. Flexible pipe like black
poly-pipe (polyethylene) has proven unsuitable. Back
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