Return level (source code)

= Return level
{title2=$z_T=F_{\rm annual}^{-1}(1-1/T)$}

A $T$-year return level has annual exceedance probability $1/T$ under the assumed stationary model. It is the corresponding <quantile> of annual maxima. Daily exceedance probabilities must be converted to annual event probabilities before using the annual <return period> definition.