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.

Ba(yesian) Ra(infall extremes) N(etwork design). This repository presents Bayesian, Maximum Likelihood, and L-moments inference methods' effect on IDF curve computation — and how those choices impact urban drainage design.