# Torricelli's Law for Tank Draining

Torricelli's Law for Tank Draining

A liquid flows out of the bottom of a funnel. By Torricelli's law, the velocity of the liquid at the outlet is , where is the acceleration due to gravity and is the depth of the liquid. The flow is then =, where is the volume and is the radius of the drain.

2gy

g

y

dV

dt

2gy

π2

r

V

r