[David Brown]

David Brown asked the Naked Scientists:
   
Will a laundry tub drain at the same rate full as half full?

What do you think?

[Johann Mahne]

Hi David,
My guess is no.
 Flow increases with pressure and pressure increases with the level of water in the tub.
10 meters equates to one bar, so there is a small difference in the tub as it empties.