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Demand for treated water is provided by the City from two treatment plants: 1) the Betasso Plant, <br />which provides water derived from the North Boulder and Middle Boulder Creek watersheds; and <br />2) the Boulder Reservoir Treatment Plant, where water is generally derived from transmountain <br />deliveries (C-BT and Windy Gap). Prior to construction of the Betasso Plant in 1965, the City did <br />not have potable treatment facilities and simply relied on the high quality waters that could be <br />diverted at its upper intakes and conveyed directly to the City. <br />Approximately 80 percent of the City's water demand is met from the Betasso Plant. The Boulder <br />Reservoir Plant provides the remaining approximately 20 percent of the treated water supply. <br />However, because the City extensively uses its C-BT water to exchange supplies from Boulder <br />Reservoir to higher points in the Basin, the Boulder Reservoir system effectively produces 50 <br />percent of Boulder's overall water supply. <br />The following provides a summary of the annual operations of the City to divert, store and deliver <br />water for municipal use. <br />• Winter Operations <br />During the fall and winter months, the City relies heavily on its Town of Boulder Ditch <br />water right. This right for 6.189 cfs is diverted into the Boulder City Pipeline (Silver <br />Lake and Lakewood Pipelines) and carried to the Betasso Treatment Plant. The Town of <br />Boulder Ditch right is normally in priority all winter, although physical supply often <br />limits how much water can be diverted. Supplemental releases from Boulder's high <br />mountain storage may also be made during the winter to meet remaining demand. To the <br />degree possible given the frozen conditions at high altitudes, the City will store water in <br />its upper reservoirs during the winter, with storage generally occurring in Barker <br />Reservoir before reservoirs located on North Boulder Creek. Barker Reservoir will <br />typically store under the water rights decreed for hydropower. <br />• Early Spring Operations <br />In the early spring and often through May, the City operates extensively under one or <br />more of its exchange rights. The City's exchange rights and agreements allow the City to <br />release water to Boulder Creek from Boulder and Baseline Reservoirs, or into the Boulder <br />and White Rock Ditch from Boulder Reservoir, in exchange for increased diversions at <br />the City's points of diversion at Barker Reservoir on Middle Boulder Creek and at <br />Lakewood Reservoir and Silver Lake on North Boulder Creek. Baseline Reservoir must <br />generally fill prior to operating this exchange. Storage in the City's reservoirs will <br />typically occur during this period and fill in June. The City's Town of Boulder Ditch <br />water right is typically still in priority during this period. The City will generally divert <br />Anderson Ditch and Farmers Ditch water rights at the City of Boulder Pipeline No. 1 as <br />early as possible. <br />• Late Spring and Summer Operations <br />During the late spring and through the summer months, Boulder will typically divert <br />water under several changed senior agricultural water rights, including its Anderson Ditch <br />and Farmers Ditch rights. These senior agricultural rights can be diverted at several of the <br />City's upper diversion points on Middle and North Boulder Creek, and carried through the <br />City of Boulder Memo.Doc Page 24 of 30 March 9, 2005 <br />