Heavy rainfall intensity as a function of duration and return period is defined according to DWA-A 531 (2012). This program reads rainfall measurement data and calculates the distribution of design rainfall as a function of both return period and duration, for durations up to 12 hours (and beyond) and return periods in the range 0.5 a ≤ Tₙ ≤ 100 a.

Plotted the Intensity-Duration-Frequency (IDF) curves by first estimating annual maximum intensity for certain time periods.

This is the statistical approach to estimate the design discharge (50 year return period flood) at a given site.

Hydrological analysis of maximum rainfall intensity data to evaluate the return period of heavy rainfalls for different durations.

A data visualizer tool produces the return period-loss graph of low-impact hazardous events for 91 countries. This tool use publicly available data from national disaster loss databases (DesInventar) and EM-DAT, but also available for other resources.