PROJ00001

• Contract/PO #: C153168
• Contractor Name: Delta, City of
• Contract Type: Loan
• Water District: 40
• County: Delta
• Bill Number: SB 77-35
• Loan Projects - Doc Type: Feasibility Study

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System Operation

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Operation and maintenance of the Delta municipal water system
is handled full time by an eight man crew which also has responsi-
bility for operation of the sewer system. In the summer additional
help is often required on Grand Mesa to maintain the pipeline
and reservoir system. Administrative matters, such as consumer
billing, is handled by the secretarial staff in the Municipal
Building.

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Since there are no remote reading water level indicators for the
treated water reservoirs on Garnet Mesa, these are read manually at
least once each day. As much as possible, water level in the
reservoirs is maintained at 18 to 20 feet to maintain as high a
pressure on Garnet Mesa as possible. The production of the filtration
plant is governed automatically by sensors on the effluent line which
monitor water pressure. As pressure decreases, indicating use on the
system or a lowering of the water level in the Garnet Mesa
Reservoirs, filtration plant production is increased to bring the
pressure back to the preset level. The pressure in the effluent line
in essence monitors the water level in the Garnet Mesa Reservoirs. A
certain pressure setting will prevent overfilling of the reservoirs
except when a lag time situation develops.

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Operation of the chemical treatment works depends on the quality
of raw water available from Grand Mesa. Disinfection by chlorination
occurs year round at the chemical treatment works and at the
filtration plant. Addition of chemical coagulants such as lime and
alum is generally only necessary during the spring when increased
turbidity may be a problem such as during high runoff.

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Raw water is supplied to the system such that the volume
in the Delta Control Reservoir is near capacity. As water use
increases and the water level in the Delta Control Reservoir
lowers, more water is turned into the system at anyone of several
intakes on Grand Mesa.

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Water at the Dirty George Headgate is picked up on a year
round basis using Delta's flow decree of 40 statutory inches,
which is equivalent to 1.04 c.f.s. Additional water up to 1.0
c.f.s. in flow water rights transferred from the Orchard Mesa
Ditch is usually only picked up at this point during the non-
irrigation season due to use of the water by senior decrees
owned by others.

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