Definitions of flowing:

• noun:   the motion characteristic of fluids (liquids or gases)
• adjective:   (of liquids) moving freely

  Example: "A flowing brook"

• adjective:   moving smoothly and continuously

  Example: "Crowds flowing through the canyons of the streets"

• adjective:   smooth and unconstrained in movement
• adjective:   (of water) rising to the surface under internal hydrostatic pressure