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On OAHU the water is from an underground source, created
by rainwater
soaking through the soil and volcanic rock to an artesian basin. The
process
takes 25 years for the water to reach the underground pool.
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The Halawa station is 165 ft above sea leveland the pump
room is
23 ft above sea level, The access shaft was dug on an
incline
near the center of the above picture. The shaft is 284 ft long because
of the 30 degree incline.
This cable car is primarily for inspection, service and maintenance
of the pumps.
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At the bottom of this shaft is the pump room where 15
million gallons
of pure water is brought up daily.
There are two pipes on the left, the top is for fresh air, the
bottom
is the pipe bringing out the water.
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Using two of the three pumps 4200 gallons a minute is
pumped out
of the site. This water is part of the supply for East Oahu, that is
from
Halawa to Hawaii Kai. Water is supplied to Oahu through 1900 miles of
pipeline at 150 million gallons of water per day.
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The cavern leading to the water source viewing area is
300 ft long.
The pipe on the left is a fresh air source.
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The water below is 60 degrees.
This small pool in the viewing area, is the end of a 919 foot long
tunnel leading back under the pump room.
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