Why does not the Moon make waves on rivers as well as on seas?

      The Moon does not exactly make the    waves of the sea, but it draws the sea after    it as the Earth spins, and as the sea usually    moves in waves, due to the wind, so the   tides rise and fall in waves. This is a wise   question, for we might think that the   water of river ought to behave as the   water of the sea does, and there is no   doubt that water everywhere, and every  liquid surface, and even the solid crust of  the Earth, is affected by the Moon.

 But the sea is deep, and so there is  enough water to be heaped up under the  pull of the Moon, and to make visible  tides. The water of a river is very shallow  in comparison with the sea, but near the  mouth of most rivers, where they merge  with the sea, the great tidal stream of water flows up and down the river as the tide flows and ebbs; and so the influence of the tides can be seen in these tidal rivers, perhaps many kilometres up from the sea.    Thus, tides can be noticed in the rivers like Garga, and in such cases the moon does 'make waves,' or rather, an inflow and outflow of water, in rivers.