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… environmental flow: the amount of water needed in a watercourse to maintain healthy, natural ecosystems. … the flow of, hold, divert or otherwise control water in a watercourse; deepen, widen or alter watercourses or lakes; … of a dam on the main stem or tributary of an international watercourse may affect water levels, fisheries, recreation …

… right to make "ordinary" use of the water flowing in the watercourse. This encompassed the "reasonable use" of that … abstracter's land and the water must be restored to the watercourse substantially undiminished in volume and … to be at its greatest. But the quantity of water in a watercourse is not the only matter that requires constant …

… way to prevent other pollutants from draining into the watercourse and regulating sediment flow, if distributed …