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tide
because the surface of water is horizontal and not vertical.........................
Presumably you are watching the behaviour of water running down a vertical surface such as a window pane or a bathtub. Here is your chance to be a scientist. Try the experiment with a oily surface, and a washed surface, and a cleaned surface, and draw your conclusions.
"surface tension"
Water waves are a special example of a combination of transverse and longitudinal oscillation. The individual particles in a water wave move with a circular motion, therefore they have both a vertical and horizontal component to their movement through the wave i.e up and down (Transverse) and side to side (Longitudinal) components.
a water fall
a water fall
a water fall
a water fall
a water fall
waves
waves
Tide.
vertical movement of a body of water called
Tide
tide
On a large scale you would call the movement a tide. On a small scale you would call the movement a wave.