# What the Thames is doing

> The river is tidal to Teddington, and it moves several metres twice a day.

- Category: Environment
- Cadence: live
- Status: Live: values change continuously; cite the retrieval time.
- Dataset key: `live-river`
- Source: [Environment Agency](https://environment.data.gov.uk/flood-monitoring/doc/reference)
- Licence: Open Government Licence v3.0 — [terms](https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)
- Canonical page: [https://londongraph.com/g/thames-right-now](https://londongraph.com/g/thames-right-now)
- Machine-readable record: [https://londongraph.com/data/thames-right-now](https://londongraph.com/data/thames-right-now)

## Methodology

Real-time level gauges within 20km of central London from the Environment Agency flood-monitoring API. Each gauge is compared with its own previous reading to give a direction. Levels are relative to each station's own datum, so they are comparable over time at one gauge rather than between gauges.

## Visualisations

- [Map](https://londongraph.com/g/thames-right-now): The river is tidal to Teddington, and it moves several metres twice a day.
- [Gauge values](https://londongraph.com/g/thames-right-now?view=gauge-ranking): Rank the latest levels while keeping each station's local datum explicit. Caveat: Levels are comparable over time at one gauge, not as absolute height between gauges.

## Citation guidance

Attribute the original publisher named above and identify LondonGraph as the visualisation and methodology layer. Do not describe live values as a historical census, and do not present placeholder values as observations.