Answer
The drainage rate is $~~1.6\times 10^{-3}~m^3/s$
Work Step by Step
We can find the drainage rate:
$rate = v~A$
$rate = (\sqrt{2gh})~(A)$
$rate = \sqrt{(2)(9.8~m/s^2)(0.30~m)}\cdot (6.5\times 10^{-4}~m^2)$
$rate = 1.6\times 10^{-3}~m^3/s$
The drainage rate is $~~1.6\times 10^{-3}~m^3/s$
