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<br />~' <br /> <br />". ,=._,,!,>4,"," >~~_ .'f'-_""._'.-io..y,,:~ <br /> <br />Annual Operating Flow Rate <br /> <br />9. This concept would identify operating criteria for low, <br />average, and high water years. <br /> <br />10. Operating criteria to emphasize lower maximum flows, higher <br />minimum flows, lower ramping rates, and daily fluctuations. <br />Flow rates would remain in the 5,000 to 8,000 cfs seasonal <br />ranges previously identified. <br /> <br />11. Reduced ramping rate on an hour-by-hour basis to prevent <br />stranding of fish or recreationists. <br /> <br />12. Maximum release 33,200 cfs, current minimum and ramping <br />rates allowed. <br /> <br />Integrated Alternatives , Related SuggestioDs <br /> <br />1. Alter hourly release criteria based on hydrologic/storage <br />conditions of system. Minimum releases to vary from 5,000 <br />to 11,000 cfs. <br /> <br />2. Increase maximum flow to 33,100 cfs and minimum flow to <br />5,500 in summer and 7,500 in winter. No restriction on ramp <br />up rate and 5,000 cfs per hour limit on ramp down rate. <br />Limit number of boating permits to 125,00 user days per <br />year. Provide pilot program with two annual sediment runs <br />(3 days each at 50,000 cfs) to coincide with introduction of <br />sand from paria River drainage. <br /> <br />3.' Maximum flows: 30,000 in winter, 20,000 in spring, 28,000 <br />in summer, and 20,000 in fall. Minimum flows 5,000 in <br />spring, summer and early falli and 1,000 in late fall and <br />winter. Ramping limited to 2 feet change (or less) in stage <br />per 8 hours at Lee's Ferry. Install multi-level intake <br />structures. Introduce about 50,000 cubic feet of sand at <br />mouth of paria River each year and install portable weirs at <br />3 sand deposit locations downstream. Evaluate after 5 <br />years. <br /> <br />4. Base load powerplants with 14,500 cfs to meet 8.23 yearly <br />volume. When higher release is needed flows may increase up <br />to 31,500 cfs, with ramping rate not to exceed 8,000 cfs per <br />hour. Increase boating permits to 200,000 user days per <br />year. Load sediment in paria River drainage to allow flash <br />flood transport. <br /> <br />5. Adjust operations to emulate pre-dam hydrology. In general <br />this alternative would require variations in release <br />patterns among various years and would involve higher spring <br />releases and low fall flows. In addition to this release <br />pattern there would have to be temperature modifications, <br /> <br />17 <br />