A fully penetrating tube well in a $30 \mathrm{~m}$ deep confined aquifer with hydraulic conductivity of $4 \times 10^{-4} \mathrm{~m} \mathrm{~s}^{-1}$ has $50 \mathrm{~L} \mathrm{~s}^{-1}$ discharge. The drawdown and radius of influence are $5 \mathrm{~m}$ and $250 \mathrm{~m}$ respectively. Diameter of the tube well in $\mathrm{mm}$ is_________
A fully penetrating tube well in a $30 \mathrm{~m}$ deep confined aquifer with hydraulic conductivity of $4 \times 10^{-4} \mathrm{~m} \mathrm{~s}^{-1}$ has $50 \mathrm{~L} \mathrm{~s}^{-1}$ discharge. The drawdown and radius of influence are $5 \mathrm{~m}$ and $250 \mathrm{~m}$ respectively. Diameter of the tube well in $\mathrm{mm}$ is_________