force acting on face length b .....= dencity x b x width x gravity x h , this acts at center of face so the turning torque is...

** dencity x 1/2 x b x b x width x gravity x h**
Force acting on face h is ....= 1/2 dencity x h x width x gravity x h

This force acts 1/3 of the way up (

www.youtube.com/watch?v=WkM1tCZDM2c)

so torque is ..... =

**1/3 h x 1/2 dencity x h x width x gravity x h **
tipping occurs when two torques are equal

so b x b = 1/3 x h x h so 3 b squared = h squared ....

**h = root 3 b **