PROJ00106

• Contract/PO #: C153494
• Contractor Name: Loveland, City of
• Water District: 0
• County: Larimer
• Bill Number: XB 99-999
• Loan Projects - Doc Type: Feasibility Study

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The results of the Phase I study demonstrated that both CBT and Windy Gap
represent significant sources of Loveland's future water supply. It is
therefore important that the more recent NCWCD policy be modeled as
realistically as possible to estimate the future supplies available to the
City. The computer models used to reflect operation of these projects
developed in Phase I were revised for the Phase II study to better reflect
both projects' historical and predicted future operations. As in Phase I,
the modeling of CBT, Windy Gap, and all other City supplies was performed
on a monthly basis. Methodologies used to simulate the operations of caT
and Vindy Gap are described in detail in the Technical Appendix.

The caT project provides supplemental water supplies to Front Range users,

i.e., project demands occur when shareholders are unable to meet their

needs from their own water supply sources. Project demands therefore

generally increase as streamflows on the Front Range decrease. CaT quotas

are based, in part, on predicted demands for the upcoming irrigation

season. The NCWCD declares a new CaT quota every April based on existing

storage in the caT system and predicted spring runoff estimated from

mountain snowpack conditions.

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Algorithms were developed and incorporated into the computer models to
calculate monthly caT demands based on projected streamflows. Using the
1,000 year record of synthetic monthly aig Thompson River streamflows
(developed in Phase I) to represent Front Range flow conditions, the runoff
for the upcoming irrigation was calculated to determine caT demands.
Similarly, the Phase I 1,000-year synthetic record of CBT inflows and
end-of-year CaT storage contents were used to predict available supplies.
Annual quotas were then computed based on these projected demands and
supplies.

The Windy Gap project provides an additional supply of water to its
shareholders. No quotas are set for use of Windy Gap water. Windy Gap
project demands were computed in a similar fashion to CBT and were based on

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