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<br />~; <br /> <br />; 'SENT BY: eOR - WCAOS SO <br /> <br />2-17-99 10:57j <br /> <br />970 385 6539 => <br /> <br />303 866 4474j <br /> <br />#8/11 <br /> <br />D. FILLING SCHEDULE AND RELEASE PROCEDUR~S <br /> <br />The cenera1 operation plan for Va1leclto Reservoir is to fill ehe reservoir during <br />the spring runoff and release ehe stored water when it is needed during the summer <br />and fall and to maineain minimum stream flows chroulh the winter. An Annual <br />Operacing Plan is developed for each water year (October 1 - September 30) by the <br />Duranlo Projects Office. The plan shows filling scenarios for minimum probable, <br />lIIaxll1lWII p1;"obable, and most probable runoff conditions. The plan includes reservoir <br />storage allowance for flood control based on the Corps of Engineers' Report on <br />Reservoir Regulation for Flood Control. The Reservoir Superintendent uses inflow <br />forecasts to determine which of the ehree scenarios to follow during filling of the <br />reservoir in the spring. <br /> <br />The spring runoff from snowmelt usually occurs from late March through .July. During <br />this period, reservoir releases are adjusted in accordance with forecast data and <br />the annual operating plan to discharle anticipated excess inflow aboye storable . <br />inflow so the reservoir fills without aptllins. The objective of this method is to <br />11111it flows in the Pine River to a maximum of 2,500 cfs. DetaIls concernIng the <br />measurement of releases from Vallecito Dam are given in Appendix A. <br /> <br />When reservoir inflow drops below the race needed co 8a~isfy adjudicaced direct flow <br />requirements, water users may order supplemencal project waCer from ehe reservoir. <br />The Reservoir Superintendent releases the total amount of water needed to meet the <br />irrigation demand. <br /> <br />General criteria for filling and release procedur~s which are used in <br />developing the annual operacing plan are: <br /> <br />(1) The reservoir Is normally drawn down below elevation 7646 by December 1 co <br />keep freeze.thaw accion away from the spillway radial gates. <br /> <br />(2) During the non-irrigation season (November 1 through April 30). and <br />assuming normal operations, the operator should prOVide a alnimum release equal <br />to inflow. The miniDlUD. recollllllendecl flow ls 2S cfs (Fish and Wildlife Service <br />comment in Kay 1958 Draft Project Status Report). Operation of the right outlet <br />works gace. will require a 50 cfs minimum Co avoid cavitation <br />(mIn. gace opening - 0.17 ft.). <br /> <br />(3) The Corps of Engineers flood control regulations and National Veather <br />Service runoff forecast are used co determine maxImum allowable scorage while <br />filling the reservoir. <br /> <br />(4) Kaximum releases are limited to 2,500 cf. to provide flood concrol benefits <br />to the Pine River. <br /> <br />(5) Release. shall not be changed Dore than 200 cfs 1n any 2.hour perIod. <br /> <br />The Reservoir Superintendent Is responsible for daily operation of the reservoir <br />within the operating criterIa. <br /> <br />111.5 <br /> <br />R.evised 03/94 <br /> <br />