Q)what height of water column would balance the atmospheric pressure in a water barometer?

We know that
Height of mercury barometer, $h_m=0.76 m$
Density of mercury, ${\rho }_m=13.6 \times {10}^3 kg/m^3$
Density of water, ${\rho }_w={10}^3 kg/m^3$
Let the height of water barometer be $h_w$
Then
$$\begin{gathered} {\rho }_{m}g{h}_m={\rho }_{w}g{h}_w \\ \Rightarrow h_w=\frac{{\rho }_m{h}_m}{{\rho }_w}=\frac{13.6\times {10}^3\times 0.76 }{{10}^3}m=10.336 m \end{gathered}$$
Therefore, height of water barometer will be 10.336 m