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Cochrane Telecom Services
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 COCHRANE
WATER SUPPLY SYSTEM
HOW IT WORKS
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Groundwater is
extracted by an intake pipe from three wells (#5, #6 and #7), each with a
capacity of 45.3 litres per second.
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The incoming
water (influent) is passed through the Head Tank, which allows air and gases
to be removed and prevented from entering the treatment system.
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In the
Clarifiers the softening process is undertaken. This involves removing the
high iron content, manganese and hardness with the use of lime. The lime
interacts with the minerals and creates “floc”. Heavy flocs drop out of the
water in the Clarifier and collect at the bottom, which is flushed out to
holding tanks every hour. Chlorine is also added to kill microorganisms,
which may carry harmful bacteria.
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In the
Recarbination Tank, carbon dioxide is added to reduce the pH to normal
levels.
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The water then
passes through the filters to remove any remaining particles and to reduce
turbidity (cloudiness of the water). These filters are made of fine sand,
activated carbon, gravel and rocks, which form rapid sand filters. The layer
of sand removes the fine bits of floc, algae and silt. The layer of
activated carbon controls taste and odour.
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The finished
water is now stored in the Reservoir that can hold 2,300 cubic metres of
water.
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The High Lift
Pumps are positive displacement pumps (pumps that “push”) that propel the
water into the Distribution System to people’s homes. A safe level of
chlorine is added prior to entering the distribution system to check the
growth of algae and microorganisms. The High Lift Pumps also send water to
the Elevated Storage Tank, which helps supply water at peak times during the
day and helps to maintain constant pressure within the distribution system.
The Elevated Storage Tank can hold 2,700,000 litres of water.
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The water in the
Distribution System is tested on a weekly basis to ensure that your water is
safe to drink.
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The Corporation of the Town of Cochrane