PROJ01997

• Contract/PO #: FS0065FX
• Contractor Name: Greeley and Loveland Irrigation Company
• Contract Type: Loan
• Water District: 0
• County: Larimer
• Loan Projects - Doc Type: Feasibility Study

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and improvements, erosion protection, land acquisition, bike trail and park improvements
and Boxelder Creek floodplain remapping.

Specific features and associated costs are identified in the section Engineers Estimate of
Probable Project Costs. Benefits and Costs are evaluated later in the report.

3) Alternative Three - Diversion to Windsor Canal

Alternative Three utilizes a detention facility and improved road embankment levee similar
to that of Alternative Two. The use of a detention facility is not desirable because of
potential negative impacts to County residents in the upper Coal Creek Basin

With this alternative, the diversion is made to the existing Windsor Canal at approximately
200 cfs through the use of a detention facility outlet structure and earthen lined channel.
The overall concept is shown on Exhibit Two. It is assumed that the arrangement for crop
payment is the same as alternative one.

This alternative reduces the flow to 290 cfs, the estimated surcharge flow the Windsor
Canal can convey. This flow number is reported in earlier work completed as part of the
hydrology study for the existing floodplain map.

Road crossing hydraulic structures and a terminal structure at the Windsor Canal are
needed for this alternative.

Specific features and associated costs are identified in the section Engineers Estimate of
Probable Project Costs. Benefits and Costs are evaluated later in the report.

This alternative has floodplain remaining from Larimer County Road 66 to the Windsor
Canal. Thus, the floodplain is not totally removed from the planning area. This alternative
requires the owners of the Wmdsor Canal to allow flow to enter their canal. The owners
have been approached and are on record as opposing impacts to their facilities. Thus they
are unwilling to accept additional flow.

4) Alternative Four - Reduced Flow through Town

Alternative Four, again, utilized a detention facility in the same area as alternatives one
and two. The design concept for this alternative are shown on Exhibit Three. The
conditions for easement and crop payment are the same as the other alternatives. The
estimated detention facility volume of600 acre-feet is the largest of the three alternatives
because the outflow is reduced to approximately 140 cfs, the estimated conveyance of the
Sixth Street road cross-section.

This alternative is similar to Alternative Three in that a discharge is planned to flow along
Larimer County Road 7. The existing road borrow ditches will be improved to increase

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