data api · United Kingdom

NRFA Data API

gauged daily flow

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Data offered docs-verified: daily river flow time series (per gauging station) · station metadata (id, name, grid reference, lat/long, river, location, station level, catchment area) · gauged daily flow statistics (mean, min, max, Q95/Q50 and similar percentiles, base flow index) · peak-flow statistics (QMED, peak-flow start/end dates) · catchment descriptors (elevation percentiles, land cover LCM 1990-2023, geology permeability, FEH descriptors, urban extent) · catchment SAAR rainfall (1941-1970 and 1961-1990 standard periods)
Coverage docs-verified: UK: England, Wales, Scotland and Northern Ireland gauging networks
Resolution docs-verified: Daily time series per gauging station
Formats docs-verified: JSON (json-object) · CSV (nrfa-csv) · FEH data (feh-data) · FEH CSV (feh-csv) · HTML
Access docs-verified: Free, no API key or authentication currently; use governed by NRFA Data Terms and Conditions (licence)

Use cases llm-inferred: FRA baseline flows from nearest gauge using gdf-statistics (mean flow, Q95, Q50) · QMED and peak-flow statistics for flood estimation cross-checks · Catchment descriptor extraction (land cover, geology, FEH descriptors, SAAR) for hydrological inputs
Audience llm-inferred: flood consultants · hydrologists · drainage engineers · GIS analysts

Constraints docs-verified: Test service: URL patterns, parameters and data formats may change before an operational release · No access controls currently, but this may not always be the case · Time-series requests accept only a single station and a single data-type per call · Update schedule is referenced on the NRFA site but not stated in the docs

Endpoints/formats from agency docs; rate limits not verified.

Metadata observed 14/10/2026 · research sweep: agency/portal (manual)