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<br />o <br />o <br />(-:J <br />t~ <br />Q':l <br />W <br /> <br />. <br /> <br />In years when the spill is predicted to be greater than 420,000 af, adjust the hydro graph <br />by first adding a nose of2,000 cfs and extending to as early as March 1. Increase nose by <br />500 cfs and increment calculation of duration until time extension is March I if <br />necessary. Ramp up on beginning of nose from base flow cannot exceed 1,000 cfs per <br />day. <br /> <br />. <br /> <br />In years when the release will be greater than 140,000, but less that 420,000 af, use the <br />following adjustment rules in this order of preference: <br />I. Decrease the peak duration from 3 weeks to 2 weeks and decrease time of <br />decending limb by as much as I week to achieve necessary reduction (105,000 af <br />reduction possible with steps - 315,000 afrelease) <br />Decrease time of ascending limb by as much as 3 weeks to achieve necessary <br />reduction(l05,000 af reduction possible - 210,000 afrelease) <br />Reduce duration of peak by as much as I week ( 70,000 afreduction possible- <br />140,000 afrelease) <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Target base flow (average weekly) following spring peak is 500 cfs at Farmington, <br />Shiprock, Four Comers and Bluff gages, measured as the average of any two of these <br />gages. Minimum release - 250 cfs. The target flow should be maintained between 500 <br />and 600 cfs, with an attempt to maintain flow closer to 500 cfs. <br /> <br />. <br /> <br />Flood control releases to be handled as a spike (high magnitude, short duration), <br />released when flood control rules require, except that the release shall not occur earlier <br />than September I. If an earlier I'elease is required, extend the duration of the peak of the <br />release hydrograph. A ramp up and ramp down of 1,000 cfs per day should be used to a <br />maximum release of 5,000 cfs. If the volume to release is less than that required to reach <br />5,000 cfs, adjust the magnitude of the peak accordingly, maintaining the ramp rates. <br />Multiple releases may be made in one year. These spike releases shall be used in place <br />of adjustments to base flow. <br /> <br />. <br /> <br />In no case shall the reservoir be allowed to fall below the elevation that allows diversion <br />of water to NIIP. <br />