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change additional St. Vrain Creek water right holdings to municipal, storage, and other beneficial <br />uses. These cases are briefly summarized below: <br />• Case No. O1CW275 -Claim for conditional, recreational water rights intended for <br />boating and kayaking uses, with the boating area extending along the St. Vrain Creek for <br />approximately '/4 mile above the Left Hand Creek confluence. The City requested <br />variable monthly amounts of flows for the recreational water rights, which were <br />adjudicated in December 2004. <br />• Case Nos. OOCW239, OOCW240, OOCW241 -Claims for change of use for ditch share <br />ownership in the Oligarchy Ditch, James Ditch and Rough and Ready Ditch, respectively. <br />Includes alternate points of diversion for the changed water rights at the City's Pipelines <br />and upper storage units, similar to the previous change cases for the upper ditches. <br />• Case No. O1CW188 -Claim for changes of use in the following ditches on the south <br />branch of St. Vrain Creek: <br />- Clough & True Ditch, <br />- Montgomery Private Ditch, and <br />- Clough Private Ditch. <br />These water rights were deeded to the City from Public Service Company in exchange for <br />a perpetual contract of Union Reservoir releases for use by Public Service Company at its <br />power plants located near Platteville and Brush, Colorado. <br />OPERATIONAL INFORMATION <br />Water Demands <br />The City's current potable demand is approximately 17,000 ac-ft/yr. As noted above, the City <br />satisfies this demand from a number of different diversion structures and storage units. In the <br />SPDSS modeling effort, the City of Longmont demand will be modeled at a single demand node <br />that is able to receive water from the various infrastructure components subject to the physical <br />limitations (e.g., pipeline capacity, diversion capacity, storage capacity) and legal limits (i.e., <br />water rights) previously presented for those components. <br />The current potable demand corresponds with a population of about 80,000, which is close to the <br />residential build out within the Longmont Planning Area, according to Longmont personnel. This <br />demand level equates to approximately 190 gallons per capita per day (gpcd) or about 280,000 <br />gallons per year (0.85 ac-ft/yr) for a family of four. The current potable demand level is less than <br />the approximately 254 gpcd South Platte River basin Northern area demand in the Statewide <br />Water Supply Initiative. Current water demand projections are based on the predominantly <br />industrial development of the remainder of the Longmont Planning Area, which include a future <br />water demand of about 35,000 ac-ft/yr and a population of about 102,000. The City's dedication <br />requirement for water rights since 1964 has been approximately 3 ac-ft per acre of annexed land, <br />or more if the proposed uses require additional water supplies. <br />In addition to supplying water for potable uses, the City irrigates public parks and green belt <br />areas with its ditch shares for those areas located along and near the ditches that run through the <br />City. These uses currently account for about 2,000 ac-ft of non-potable demand. These lands can <br />City of Longmont Operating Memorandum.doc Page 15 of 21 March 2, 2005 <br />