# Water Flow Rate Through an Orifice

## Water Flow Rate Through an Orifice formula

\(\large{ Q_w = 0.0865 \; C_d \left( \frac{d_o}{4.654 } \right)^2 \; \sqrt { \frac{ p_1 \;-\; p_2 }{ SG } } }\) |

### Where:

\(\large{ Q_w }\) = water flow rate

\(\large{ d_o }\) = diameter of orifice

\(\large{ C_d }\) = discharge coefficient

\(\large{ p_1 }\) = primary pressure

\(\large{ p_2 }\) = secondary pressure

\(\large{ SG }\) = specific gravity of water

Tags: Equations for Flow Equations for Water Equations for Orifice and Nozzle