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I I I I I I I I I I I I I I I I I I I 6.0 INFLOV ANALYSES - VINDY GAP PROJECT (TASK 4) The Windy Gap project (VGP) is located two and one-half miles west of Granby, Colorado and consists of a diversion dam, a pumping plant, and a pipeline to Lake Granby (see Figure 5-1). The project was completed and placed in operation in 1985. The NCVCD reports that this system is capable of delivering an average of 48,000 acre-feet of surplus water. This water is pumped during the runoff season when the Windy Gap water rights are in priority, which normally occurs between April and July. During these periods of high flows in the Colorado and Fraser Rivers, water is pumped from the diversion dam north to Lake Granby if space is available for storage in Granby. Once there, it is stored until Adams Tunnel capacity is available for transmitting the water (when called for by owners) through the Colorado-Big Thompson project facilities to the northern Front Range where it is distributed to the participants in accordance with their water allotment contracts. The operational model of the VGP was designed to calculate the available inflow to the project and to account for operational constraints placed upon the project. Streamflow data at the project site are relatively limited, consequently this data was supplemented by regional streamflow data and the CBT inflow data developed for this study to estimate available inflows to Vindy Gap. Examination of the topography of watersheds contributing to VGP inflow revealed that the lands draining the upper Fraser River basin were relatively rugged in nature, with steep gradients and the Continental Divide acting as the major basin divide. Five streamflow gauges in the Fraser River basin were selected to define the relationship between VGP inflows from the upper Fraser and the CBT inflows previously computed. These stations were: 6-1