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Local-first flood warning network: community sensors share readings over a Reticulum mesh that keeps working when the internet goes down, so a surge seen upstream warns towns downstream. Built at SwampHacks 2026.
Home Assistant integration for the official Swiss hydrological monitoring network (FOEN/BAFU): live water temperature, water level, discharge and flood danger levels of Swiss rivers and lakes
n8n template: river flood early warning for Tabasco, Mexico. Open-Meteo discharge forecasts, a local Ollama model writes the bulletin, Slack alert only when a river is at risk.
Pukaar (पुकार): flood early warnings for Himalayan villages on AWS. Forecasts every 15 min, rule-based risk levels, one-tap officer approval (Step Functions), spoken Hindi alerts (Polly) with acknowledgement. Environmental Hacks: Heat and Water.
Upstream river gauges as early warning: gauge graph in LadybugDB, crest travel times and a LangGraph agent with graph RAG and reviewed flood briefs. Potomac (USGS) and rio Cauca, Colombia (IDEAM, in Spanish)