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Moderate Fluctuating Flow Alternative Under this alternative, the daily change in flow in a 24-hour period would be limited to 12,000 cis when the monthly release volume is 800,000 acre-feet or greater. The change is limited to ~45 percent of the mean monthly flow for volumes less than 800,000 acre-feet. This amounts to 7,500 cis for a 500,000 acre-foot monthly volume. Maximum flows would be limited to 31,500 cis; any releases greater than 31,500 cis would be steady flow. Minimum flows would be limited to 5,000 cis. The figure compares moderate fluctuating flows (solid black line) with actual operations for a day in July. High Fluctuating Flow Alternative - This alternative relates releases to hydrology, power system flexibility, and specific resource needs. Fluctuations would range from 15,000 to 22,000 cfs over a 24-hour period, depending on the monthly release volume. The maximum flow would be limited to 31,500 cfs; any releases greater than 31,500 cfs would be steady flow. Minimum flows would be 3,000, 5,000, or 8,000 cfs, depending on monthly volume, firm power load, and market conditions. Releases would be steady during months when the release volume exceeds 1 million acre-feet. The figure compares high fluctuating flows (solid black linej with July 5,1989, flows. No Action Alternative - This alternative reflects historical operations and forms the basis for comparing impacts. The maximum daily flow is determined by a combination of water availability and power A day in July under the MODERATE FLUCTUATING FLOW ALTERNATIVE might look like... 40000 30000 - .! " - Moderate Fluctuatln Flow Alternative : 20000 III .. 'i II: 10000 o .~ .~ .~ .~ .~ rP~ q~ q~ q~ q~ q~ ~ ~ ~ ~ ~ ~ . ~ ~ ~ ~ ~ , ~ A day in July under the HIGH FLUCTUATING FLOW ALTERNATIVE might look like... 40000 30000 - J! " - : 20000 III .. ii II: 10000 o HIgh FluctuatIng Flow Alternative ".~ L.~ ....~ .~ .~ rP~ q~ q~ q~ q~ q~ ::,.i" r ~ ~ ~ ~ . 'l- ~ tl ~ ~ # ~ 7