Answer
10.34 m
Work Step by Step
Please see the attached image first.
By considering the pressure at the same elevation. We can write,
$P_{2}=P_{0}$
$P_{1}+h\rho g=P_{0}$ ; Let's plug known values into this equation.
$0+h\times1000\space kg/m^{3}\times9.8\space m/s^{2}=1.013\times10^{5}\space N/m^{2}$
$h=\frac{101.3}{9.8}m=10.34\space m$
