ARR Data Hub
The official portal for Australian Rainfall & Runoff design inputs — losses, temporal patterns and preburst.
The US precipitation-frequency standard — point rainfall depths for any duration and return period, free.
by NOAA National Weather Service
NOAA Atlas 14, served through the Precipitation Frequency Data Server, is the authoritative source of design rainfall for most of the United States: point precipitation depths and intensities across durations from 5 minutes to 60 days and return periods to 1,000 years, with confidence bounds, downloadable as tables, grids and IDF-ready data.
Every US drainage manual keys its storms to Atlas 14 volumes, so this is where hydrology sections actually start. (Its successor, NOAA Atlas 15, is in progress to address non-stationarity — worth watching for long-lived designs.)
Other data, monitoring & forecasting tools covering similar workflow stages.
The official portal for Australian Rainfall & Runoff design inputs — losses, temporal patterns and preburst.
Gauge-blended satellite rainfall at 0.05°, daily, since 1981 — the standard for drainage work in data-sparse regions.
The open global large-sample hydrology dataset — thousands of catchments with forcing, attributes and streamflow.
Deltares' operational forecasting platform — the shell running national flood-forecast centres worldwide.
ECMWF's hourly global reanalysis — the default gap-free climate forcing record for ungauged catchments worldwide.
NASA's 30-minute, 0.1° global precipitation record — the highest time resolution of any satellite rainfall product.