C150080 approval letter

• Contract/PO #: C150080
• Contractor Name: Larimer County, Board of County Commissioners
• Contract Type: Grant
• Water District: 3
• County: Larimer
• Loan Projects - Doc Type: Approval Letter

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The primary benefits of the proposed multi-objective project for Dry Creek include:
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Reducing the frequency and severity of flooding
Decreasing predicted flood damages to existing development.
Reducing the potential for loss of life.
Enhancing and restoring the natural and beneficial functions of the floodplain.
Alleviating health hazard.
Reducing clean-up and maintenance costs.
Reducing emergency relief costs.
Reducing income, rental, sales, or production losses.
Reducing traffic delays.
Protecting of the Larimer and Weld Ditch conveyance.
Increasing recreational opportunities.
The secondary benefits include:
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Reducing inconveniences.
Reducing liability.
Increasing sense of security.
Reducing emotional stresses to residents.
Improving the aesthetic environment.
Improving water quality.
Reducing flood damages to future development.
In addition to providing the community with direct flood control benefits, the proposed project
will enhance many of the natural functions of floodplain areas. The propased flood channel is
a grasslined channel that would be incorporated into a natural area and public park. Riparian
vegetation and natural tnaterials will be incorporated into the project design. As part of the
stormwater management program, Fort Collins has been incorporating natural processes and
materials into flood channel designs. The City has been implementing the principles of "multi-
objective management" into stormwater management and floodplain projects.
PROJECT COSTS AND BENEFIT ANALYSIS
The improvement costs for the Dry Creek Basin are estimated in two cost schedules. The first
schedule is for the constructian of the main flood control features which will provide 100-year
flood protection from the tributary area upstream of the Eaton Ditch which is the major
portion(9�%) of the basin. These project improvements consist of a diversion channel and related
natural features to accomplish the project objectives. The proposed channel will divert
floodwaters on Dry Creek directly to the Cache La Poudre River, thereby protecting the
developed portion of the basin. The estimated cost of the diversion channel is $2.5 million.
The second schedule is the proposed improvements along Dry Creek as it flows through the City
in its diagonal direction to the southeast. The purpose of these channel improvements is to
address the localized drainage problems and provide the existing channel with the capacity to