You might be interested in reading about the water cycle. Rivers constantly dump water into the sea, but water evaporation does the trick here.
A waterfall is just water falling over an incline and does not reduce the total freshwater volume of the river.
Water vapour from plants, water evaporated from the ocean, etc. form clouds which then rain on land and replenishes the fresh water supply of rivers and etc. It’s all about equilibrium, otherwise every river in the world would not exist.
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