Data sources

J'arrose ? produces no water restriction data of its own: it takes public data every day and presents it commune by commune. Only the prefectural decree is legally binding: each commune page shows the original text of the decree and links to its PDF. Source data (zone names, decree texts) is in French, as published.

Water restrictions: VigiEau

Restriction zones, their level (vigilance, alert, heightened alert, crisis) and the measures of each decree come from the Donnée Sécheresse - VigiEau dataset, published by the French Ministry for the Ecological Transition under the Licence Ouverte 2.0 (Open Licence). The official service is vigieau.gouv.fr.

The data is read again every morning. The date of the last update is shown on each commune page.

Communes and departments: API Géo

The list of communes, their postcodes, and the outlines of communes and departments come from API Géo, under the Licence Ouverte 2.0. The map of France on the home page is a simplified version of these outlines.

Rain forecasts: MET Norway

Rain forecasts come from the Norwegian Meteorological Institute: Data from MET Norway, under the CC BY 4.0 licence. They are requested for a point near the centre of the commune.

What J'arrose ? works out

• The zone of a commune: a commune is attached to every restriction zone that covers part of it, as VigiEau does. When zones of different levels share a commune, the page says so and the verdict follows the highest level, to be safe.
• Watering hours: they are read automatically from the text of the decree. When the text does not allow them to be read with certainty, the page shows "Check the decree" rather than guess.
• The verdict ("Can I water?") combines these hours, the current time and the forecast rain. It is worked out in your browser.

An error, or data that does not match the decree? Write to [email protected].