Last updated: 1 July 2026
FloodCheckGH is a static web app with no accounts, no backend server, no database, no cookies, no analytics, and no advertising or tracking. We do not collect, store, sell, or share your personal data.
To draw maps and compute flood risk, your browser sends the location you choose (a map click, a GPS fix, or a search term) directly to these third-party services. FloodCheckGH itself receives and stores nothing.
| Service | Receives | Why |
|---|---|---|
| OpenStreetMap, OpenTopoMap, Esri | The map area you view | Map tiles (streets / terrain / satellite) |
| Open-Meteo | The coordinates you check | Ground elevation (Copernicus DEM) |
| Overpass (OpenStreetMap) | The coordinates you check | Nearest rivers / lagoons / drains |
| Nominatim (OpenStreetMap) | Your search text | Turning a place name into coordinates |
| unpkg | Standard request metadata | Serves the Leaflet & Turf map libraries |
| Google Maps | The coordinates — only if you tap “Street View” or “Google Maps” | Opens Google in a new tab |
Each service processes the request under its own privacy policy. FloodCheckGH does not add identifiers to these requests and never receives a copy of the results server-side.
If you install the app or use it offline, a service worker caches the app files and recently viewed map tiles
on your own device so it works without a connection. Nothing is uploaded. Clear it any time via your
browser’s site-data / “clear storage” settings. We use no cookies and no localStorage for personal data.
“Use my location” only runs when you tap it and your browser grants permission. The coordinates are used to place the map pin and to make the lookups above — they are not logged or retained by FloodCheckGH.
Flood ratings are informational and combine documented history with modelled terrain data. They are not a substitute for a professional site survey, valuation, or insurance assessment.
Questions or a data concern? Open an issue on the project repository.