What is the Time to Drain a Tank with a Small Hole at the Base?

[powerbuddy]

A large tank with Diameter D, open to the air , contains water upto heigh h . A small hole with diameter d( d<<D) is made at the base of the tank. Ignoring the effects of visocity , calculate the time it takes for the entire water to drain completely.

 

[emptymaximum]

ok. so what's the problem? what have you done already?
where are you stuck?

 

[alex72]

that would be a streamline problem solved using the Torracelli eqn, n'est pas?