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~ . e e , 4). CWCB Pre-Application Form for Construction Loan Fund. Loveland owns raw water supplies from four sources, in two river basins. The City treats this water at the Chasteen Grove Water Treatment Plant, located on the banks of the Big Thompson River in the foothills about seven miles west of the city limits. Water is diverted directly from the river into the plant, or farther upstream through portions of the CBT system facilities and through the City's emergency storage reservoir, commonly known as Green Ridge Glade Reservoir, after leaving the CBT system facilities. A system schematic is attached for illustration. The current 600 ac-ft of capacity is inadequate for today' s emergency storage needs. An expanded reservoir will improve Loveland's emergency storage, and will provide drought protection today and for future generations. The City's water supplies include: o 10,404 units of CBT Project water, which is water originating on the Western Slope of Colorado in the Colorado River Basin and brought to the East Slope through Adams Tunnel into the Big Thompson River Basin. o 40 units of Windy Gap Project water, which is water originating on the Western Slope of Colorado in the Fraser River, which is tributary to the Colorado River, and delivered through CBT Project facilities. o Up to 12.44 cubic feet of native direct flow water per second, depending on the season, originating in the Big Thompson River and diverted directly into the City's water treatment plant. The quantity available on a year around basis is 3.44 cubic feet per second. o Water originating in the Big Thompson River pursuant to the City's ownership of shares in several local irrigation companies. The yields of these sources vary considerably from year to year, depending on climatic conditions such as rainfall, snowpack, and soil moisture. Green Ridge Glade Reservoir is an important component of the City's water system. It serves almost exclusively as an emergency, on-site raw water supply in the event there is any interruption in the City's normal supplies from either the Big Thompson River or the CBT System, or from both simultaneously. Reservoir construction began in 1977, the year after the devastating Big Thompson River Flood which severely damaged the CBT system and left Loveland residents without an adequate water supply for several weeks. Loveland's population in 1977 was about 25,000. The reservoir's 600 ac-ft capacity is very small in comparison with the City's current service population of over 44,000. It is estimated that GRG Reservoir provides less than six days of supply at 1996 peak use rates. This level of emergency storage presents an unacceptable risk to Loveland citizens and water customers. An expanded reservoir will lower that risk. An additional reason for reservoir expansion is to provide drought protection. The City legally owns, and could annually divert, about 8,000 ac-ft of water on the average from shares in the ditch companies. It currently can utilize only about 2,300 ac-ft of this water, because when most of it is available the City's deffiands are lower than the available supply, and no storage exists for the additional flow. If that water were stored, the City could use it as needed and much of its CBT water could be made available for agricultural uses in this region. The water supply study completed in 1988 (CWCB staffhas copies) recommended a combination of measures. These include the purchase of additional CBT units, which was accomplished in 1990-91, additional water conservation measures, and the expansion of GRG Reservoir. A summary of that study is attached. In 1989, City officials implemented an 8-year program of increasing revenues to finance these drought study recommendations, including reservoir expansion. City financing capabilities are currently in place to fund a reservoir expansion from 600 ac-ft to 6,000 ac-ft.