The Geography of Victoria: Historical, Physical, And Political
The Geography of Victoria: Historical, Physical, And Political
J W John Walter Gregory
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The estuary was thus enclosed as a lagoon. The second stage in the formation of the lakes was the partial silting up of the lagoon. The unfilled portions remain as the Gippsland lakes. The material 142 THE GEOGRAPHY OF VICTORIA which has filled up most of the old lagoon, came from two chief sources. Most of the material was brought by rivers from the highlands of Gippsland. All rivers carry more or less mud, and the brown-watered rivers of Victoria, carry an unusually large amount. The amount o...f silt that a river can carry depends upon its velocity. If the flow of a muddy river be suddenly checked, part of the load of sediment must be dropped. When a river enters a lake, the current spreads outward, on both sides ; and, as the width of the current increases, so its velocity decreases. Therefore a river drops most of its sediment as soon as it enters a lake. A familiar instance of this action is the Rhone, which enters Lake Geneva coloured milk-white with glacial mud ; but it at once drops this material on entering the lake, and the river issues from the other end of the lake, as clear as the sparkling waters of a spring.
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