Most of the himalayan rivers are perennial in nature. explain

Most of the Himalayan rivers originate from the snow covered Himalayan mountain ranges. During rainy seasons these rivers receive water from rains crated by southwesterly monsoon winds. On the other hand during the summer the snow in the sources of such rivers melts providing a continuous supply of water. Himalayan rivers hence has water throughout the year from either melted snow or rain making them perennial.

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when the chinese communist party took power in 1949, it began to build new di and levees to hold the yellow and yangtze rivers back.