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Mackenzie Valley pipe line terrain investigation. Published 1970. Upper Mackenzie Region - Surface Water Hydrology Legend Shows: H - River stage or depth D - River discharge or flow Q - Water quality SI - Sediment load Sc Suspended sediment (chemistry) B Bank material (chemistry) ● Indicates Mackenzie River ■ Water data - Fisheries Riverbank Stability Low sensitivity - gentle slope Moderate sensitivity - slope 15°-35° High sensitivity - slope over 35° Mean breakup date of river ice Mean date water clear of ice Probable ice jam