A student is performing the experiment of Resonance Column. The diameter of the column tube is $4\,\text{cm}$. The frequency of the tuning fork is $512\,\text{Hz}$. The air temperature is $38^\circ\text{C}$ in which the speed of sound is $336\,\text{m/s}$. The zero of the meter scale coincides with the top end of the resonance column. When first resonance occurs, the reading of the water level in the column is