C153773 Feasibility Study

• Contract/PO #: C153773
• Contractor Name: Morrison, Town of
• Contract Type: Loan
• Water District: 9
• County: Jefferson
• Bill Number: HB 95-1155
• Loan Projects - Doc Type: Feasibility Study

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Summary - Water Source Based Design Criteria
The water source to support the demands for a 1,475 EQR development requires a peak
monthly average diversion rate of 3.61 cfs, although the water rights allow for a peak diversion
rate of 4.45 cfs. Due to limitations on water for storage as decreed in the water rights, a
maximum monthly average of only 1.6 cfs of the total 4.45 cfs can be pumped to the Cooley
Reservoir. However, a pumping rate of 2.5 cfs to the Cooley Reservoir is recommended to
accommodate peak diversion rates.

In summary, at full build-out:
. the intake should have a capacity of 4.45 cfs,
. the treatment plant should have a capacity of about 2.0 MGD, and
. the pump system to Cooley Reservoir should have a peak capacity of 2.5 cfs.

B. RAW WATER SUPPLY

Four basic options exist for supplying water to Morrison's municipal system from Bear Creek.
However, two of the four options have been eliminated based upon cursory system analyses.
The four options are:

1. Maintain the existing intake system to supply water by gravity to the Morrison Operating
Reservoir and the water treatment plant. The existing system is functional and requires
only periodic maintenance. However, to increase flow rate capacity necessary to support
additional development and improve the reliability of the system, upgrades will be
necessary at the intake. This option irwolves the eventual replacement of the upstream
section of pipe at the headgate and new grit chamber. Also, the diversion dam should
be upgraded to reduce maintenance, il'1crease reliability, and protect the intake from flood
damage.

2. Construct a new pumping station to take water from Bear Creek at a point near or
within the Town limits. This option involves abandoning the existing gravity pipeline in
favor of constructing a new dam, intake, stilling basin, pipeline and pump station near the
treatment plant. Water would be pumped from Bear Creek to the operating reservoir and
the treatment plant.

3. Construct new intake and pumping station on Bear Creek (similar location as in 2.
above), and pump directly to Cooley Reservoir and a high elevation treatment plant.

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