# Water Velocity through Piping

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

## Water Velocity Through Piping formulas

$$\large{ v_w = \frac{ 0.134 \; Q_w }{ 3600 \; \pi \; { \left( \frac {d}{24} \right) ^2 } } }$$

$$\large{ v_w = 0.408 \; \frac{ Q_w }{ d^2 } }$$

Symbol English Metric
$$\large{ v_w }$$ = water velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$
$$\large{ \pi }$$ = Pi $$\large{3.141 592 653 ...}$$
$$\large{ d }$$ = pipe inside diameter $$\large{in}$$ $$\large{mm}$$
$$\large{ Q_w }$$ = water flow rate $$\large{\frac{ft^3}{sec}}$$ $$\large{\frac{m^3}{s}}$$