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3. From City WWTP Outfall (North Boulder Farmers ditch return flows) to Boulder City Pipeline No. 3 and Island <br />Lake, Silver Lake, Green Lakes Reservoirs Nos. 1, 2, and 3, Skyscraper Reservoir, Albion Reservoir, Goose Lake, <br />Barker Meadow Reservoir. <br />Pending Water Right Cases <br />The City has the following cases pending in the Division 1 Water Court to provide further <br />flexibility in managing its water resources operations: <br />• Case Number 99CW217 -Pending application for 3,687 acre-feet of additional storage in <br />Barker Meadow Reservoir, with a 11,687 acre-feet conditional refill. <br />• Case Number OOCW226 -Pending application for Windy Gap Project exchange right of <br />200 cfs. Water available to the City from its 37 units of Windy Gap Project water would be <br />delivered to Boulder Creek at the outlet of the Boulder Creek Supply Canal and an <br />equivalent amount of water is diverted at the City's upper intake points on North and <br />Middle Boulder Creeks. <br />OPERATIONAL INFORMATION <br />Water Demands <br />The City's current annual potable demand is approximately 22,000 acre-feet (19.6 MGD average <br />and 13 MGD during the winter). As noted above, the City satisfies this demand from a number of <br />different diversion structures and storage units. In the SPDSS modeling effort, the City of Boulder <br />demand will be modeled at a single demand node that is able to receive water from the various <br />infrastructure components subject to the particular limitations previously discussed for those <br />structures (e.g., pipeline capacity, diversion capacity, storage capacity), and legal limits (i.e., water <br />rights) previously presented for those components. <br />The current potable demand corresponds with a population of about 110,000. The City's current <br />demand of 19.6 MGD equates to approximately 180 gallons per capita per day (gpcd) or about <br />263,000 gallons per year (0.81 ac-ft/yr) for a family of four. The City's current demand level is <br />less than the approximately 254 gpcd South Platte River basin Northern area demand reported in <br />the Statewide Water Supply Initiative. <br />The projected build-out population of the City is about 140,000. Per capita water use is expected <br />to decline in the future to approximately 165 gpdc, and the prof ectedbuild-out annual water <br />demand for the City is 26,000 acre-feet (23.1 MGD average and 15 MGD in the winter). <br />About two-thirds of the annual potable water demand in the City is used for indoor purposes and <br />about one-third for outdoor irrigation. The indoor usage percentage is higher than other areas of <br />Colorado due to Boulder's more compact urban form, with a predominance of smaller lots and <br />multifamily housing units. Indoor use is fairly constant over the course of the year. Of the total <br />indoor uses, approximately 62 percent is used for residential purposes, with the remaining 38 <br />percent allotted to commercial, industrial, municipal and other uses. <br />City of Boulder Memo.Doc Page 21 of 30 March 9, 2005 <br />