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18. Daily cycle of power project operations showing the variation in water 



level for the high pool, low pool, and outside areas. Periods when filling 



and emptying gates are open are also shown 24 



19. Schematic illustration of elevations and ranges of water levels in the high 



pool, low pool, and outside areas for spring, mean, and neap tides 25 



20. Depth distribution of herring schools in Passaimaquoddy Bay as determined 



by sonic- sounder recordings (upper) day, (lower) night 28 



Vll 



