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Lawn irrigation return flows (LIRFs) associated with outside uses of water diverted through the <br />City's potable treatment plants have been neither quantified nor adjudicated. <br />General Operating Principles <br />Operation of Boulder's water supply system is governed by the following general principles: <br />• The system is operated to maximize its water supply yield, subj ect to the ability of its <br />water treatment plants to reliably produce high quality finished water. Hydropower <br />generation from the excess water pressure in the system is a secondary objective. <br />• As a first priority in meeting its water demands, the City maximizes its diversions under its <br />direct flow rights. <br />• As a second priority, the City uses its C-BT and Windy Gap supplies as an exchange <br />source for transferring water into its upper Boulder Creek basin reservoirs and pipelines. <br />• As a third priority, during the irrigation season when the Boulder Feeder Canal is running, <br />the City delivers its C-BT and Windy Gap supplies directly into the Boulder Reservoir <br />Water Treatment Plant to supplement native basin and direct flow rights. <br />• The City takes water from its mountain reservoirs or water stored in Boulder Reservoir <br />into the treatment plants to meet any <br />remaining demand. The City attempts to <br />minimize spring and summer releases from <br />its reservoirs in order to preserve this storage <br />water for meeting fall and winter demands <br />and for multi-year drought protection. <br />• The City supplies water to satisfy the <br />commitments made by the City to the <br />Colorado Water Conservation Board for <br />provision of instream flows on North <br />Boulder and Main Boulder Creeks. <br />Boulder Creek - Instream Flow Objectives <br />The City leases any excess C-BT and <br />Windy Gap supplies to agricultural users in Boulder Creek on an annual basis. <br />System Operations <br />The City has obligations to provide potable water supplies within its service area. The City meets <br />demands on its system using a combination of its direct flow water rights, storage in its upper <br />reservoirs and at Boulder Reservoir, C-BT and Windy Gap Project deliveries, and regular use of <br />several water right exchanges. <br />City of Boulder Memo.Doc Page 23 of 30 March 9, 2005 <br />