HydrionisGlobal Water Intelligence
Coverage

The Hydrionis monitoring network

Every gauging station, borehole, raingauge and monitored reservoir Hydrionis holds a record for, indexed by country and by what it measures. There is deliberately no page per station.

21,227 monitoring locations13 networksfrom 1806
21,227
Monitoring locations held
36,671,190
Observations from them
13
National networks
1806
Earliest record

Networks held

NetworkLocationsMeasuresRecordObservations
England10,4009,635 sampling and rain gauges, 409 observation boreholes, 356 river gauges1836–20261,851,466
United States4,6302,314 river gauges, 1,878 sampling and rain gauges, 250 observation boreholes, 188 monitored reservoirs1806–20266,523,277
France1,542896 river gauges, 641 observation boreholes, 5 sampling and rain gauges1877–20261,527,764
Poland907904 river gauges, 3 sampling and rain gauges1931–2026146,307
Germany768745 river gauges, 23 sampling and rain gauges1853–20261,985,560
Sweden719694 river gauges, 25 sampling and rain gauges1836–202611,449,184
Scotland712358 sampling and rain gauges, 309 river gauges, 45 observation boreholes1929–2026296,739
Finland677672 river gauges, 5 sampling and rain gauges1847–202610,801,711
Ireland454451 river gauges, 3 sampling and rain gauges1867–2026402,269
Netherlands409381 river gauges, 28 sampling and rain gauges1846–2026712,870
United Kingdom66 sampling and rain gauges1814–2026873,477
Canada22 sampling and rain gauges1866–202447,850
Norway11 sampling and rain gauges1881–202652,716

Going deeper

Each network above has a page with its map and its longest records. The England monitoring network has a fuller page with station-level detail. Station data is published through the Hydrionis datasets and the static API, and every value carries the station it was measured at.

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