Flow visualizations (animations) are based on the flow direction and pipe diameter. We've set a minimum threshold for the animation to run. You won't see the animation if the flow is lower than the following values:

l/s: 0.001 

ft3/s: 0.000035

l/m: 0.06

l/min: 0.06

gal/min: 0.0159

m3/h: 0.0036

m3/d: 0.0864

Ml/d: 0.0000864

Mgal/d: 0.0000228

Mgallon-imp/d: 0.000019

acre ft/d: 0.00007

The magnitude and velocity of the flow values are calculated through the simulation with all the data available.  

The Flow panel shows the distribution of the flow across the network, as well as the total length of the pipes with a specific flow range.