Web apps for water engineering

The official portal for Australian Rainfall & Runoff design inputs — losses, temporal patterns and preburst.

Browser-based hydrology and hydraulics calculators for practising engineers — no install, report-ready output.

Near-real-time 10m land cover from Google/WRI, updated every Sentinel-2 pass — land cover that keeps up.

EPA's free tool for estimating site runoff reduction from green infrastructure, with climate scenarios.

Rapid flood modelling in the browser — steady-state inundation estimates in seconds, anywhere on earth.

Browser-based rainfall frequency analysis — fit and rank 11 distributions with confidence intervals.

Click anywhere on earth, get the upstream watershed in seconds — free delineation in the browser.

Planetary-scale geospatial analysis in the cloud — the data catalogue and compute behind modern water remote sensing.

CUAHSI's platform for sharing hydrological data and models — DOIs, collaboration and linked compute.

Pixel-level surface water history since 1984, built from the entire Landsat archive — where water has been, and when.

A STAC API and Jupyter environment over petabytes of satellite data — Sentinel, Landsat, MODIS, ERA5, CHIRPS and more.

The unified search portal across every NASA Earth-observation archive — SRTM, MODIS, SMAP, GPM, GRACE and more.

The US precipitation-frequency standard — point rainfall depths for any duration and return period, free.

Transform elevations between vertical datums — the essential fix-up for US coastal flood and drainage models.

EPA's Climate Adjustment Tool for SWMM — apply downscaled climate projections to rainfall and evaporation inputs.

USGS web tool for basin delineation and regression-based flow statistics at any US stream point.

Free web tool for building synthetic design-storm patterns — 560+ temporal patterns, exportable to SWMM and HMS.

EPANET in the browser — build, import and run distribution models on a map with zero installation.