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<br />December 2003 <br /> <br />1990s, with no policy options for protection/restoration of humpback chub; beach habitat <br />building flows (BHBF) only permitted following regulatory spills from GCD. <br /> <br />2. SASF. Seasonal adjusted steady flows intended to mimic natural hydrograph as closely as <br />practical (spring peaks, winter minima); no diurnal flow fluctuation, and no other measures <br />for HBC protection/restoration. BHBF only permitted following regulatory spills from GCD. <br /> <br />3. POWER (P). Flows from GCD set for optimal power production (load following), with 3k-30k <br />diurnal range over entire year (similar to mid 1980s flows). No measures for HBC <br />protection. BHBF only permitted following regulatory spills from GCD. <br /> <br />4. MLFF+FSF+BHBF. Modified low fluctuating flows as 1990s during Jan-August, followed by <br />fall (Sept.-Dec.) low steady (or slowly declining) flows without diurnal fluctuation. <br />Followed in January by BHBF in years when steady flow period has resulted in significant <br />accumulation of sediments from summer tributary sediment inputs. <br /> <br />5. P+FSF+BHBF. Load following diurnal flows (3-30K cfs) during Jan-Aug, followed by low <br />steady flows (FSF as in option 4) and Jan BHBF in years of significant tributary sediment <br />input. <br /> <br />6. P+MLFF+FSF+BHBF. Similar to option 5, except load following flows permitted only <br />January-May, followed by low modified fluctuating flows (MLFF) over the summer period <br />prior to fall steady flow period and BHBF (aimed primarily to improve recreational boating <br />conditions during peak summer use period). <br /> <br />7. P+BHBF Anytime. Similar to option 3 (load following all year, 3-30K diurnal variation), but <br />with beach habitat building flows permitted at any time deemed optimum for sand <br />retention in the system (e.g., following major tributary sediment inputs). <br /> <br />8. P+TCD8. Similar to option 3(load following all year, 3-30K diurnal variation), but with <br />temperature control device for all eight GCD turbines to provide minimum summer GCD <br />outflow temperature of 15.C. No BHBF specified except as opportunity arises through <br />regulatory releases. <br /> <br />9. P+TCD8+MECH. Similar to option 8 (power production by load following 3-30K, TCD <br />installed for all eight GCD turbines) but including mechanical removal program <br />(electrofishing, netting, etc) to control development of warmwater exotic predators <br />(striped bass, catfish, carp, etc.). <br /> <br />10. P+SF/BHBF+ TCD8+MECH. Load following power flows Jan-May (3-30K cfs) followed by low <br />steady (or slowly decreasing but no diurnal fluctuation) flows to Dec and Jan BHBF if <br />sediment inputs permit. Temperature control device on all eight GCD turbines, mechanical <br />removal as in option 9 to prevent warm water exotic fish responses to temperature <br />increase. <br /> <br />II. P+FSF/BHBF+TCD8+TURB. Load following power flows (3-30K cfs) Jan.-Aug., followed by <br />low steady flows September-December and BHBF in January. Temperature control device <br />on all eight GCD turbines. Turbidity increased seasonally from Paria River whenever it is <br />not naturally turbid over the summer and fall (June-November), by mechanical sediment <br />inputs, to disadvantage visual exotic predators. <br /> <br />2 <br />GCDAMP MATA: <br />December 2003 Workshop Report <br />