The equation of continuity is
area of cross-section of flow of water × velocity of water = constant.
Hence the velocity of water is inversely proportional to the the area of cross-section of water flowing.
When water runs deep then the area of cross section of the flowing water is more than when its shallow so the velocity is less for deep water.
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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