This system will be under maintenance on Wednesday October 26th, between 6 PM and 9 PM

High Intensity Rainfall System V3

The High Intensity Rainfall Design System is a web-based programme that can estimate rainfall frequency at any point in New Zealand. It can be used to estimate rainfall depths for hydrological design purposes, and to assess the rarity of observed storm events.

NIWA’s High Intensity Rainfall Design System (HIRDS) offers planners and engineers more certainty about the frequency of high-intensity rainfalls, enabling them to better design stormwater drainage systems and other structures.

Learn about this program and how to use it

Generate the rainfall table

    • NZTM
    • WGS84
    • NZMG
    • NZGD1949

    NZTMRedraw map

    WGS84Redraw map

    NZMGRedraw map

    NZGD1949Redraw map

  • Projected temperature changes
    °C °C °C