Runoff Coefficient

The runoff coefficient is the ratio of the inflow rate, $i*Area$, to the peak discharge rate, $q_{peak}$. The coefficient will vary from storm to storm and is calculated with the equation:

$C=\frac{Q_{surf}}{R_{day}}$ 2:1.3.15

where $Q_{surf}$ is the surface runoff (mm H$_2$O) and $R_{day}$ is the rainfall for the day (mm H$_2$O).