Catalogue
Tools & technology for flood response and prevention
A plain-language catalogue of the tools and technologies that actually exist for detecting, warning about, modelling and physically reducing mountain floods — with the real systems and reference projects behind each one.
Monitoring & detection
Technologies that watch hazard zones before anything fails.
Optical & radar satellites
Sentinel-1/2 and Landsat track glacial lake growth, ice-dam thinning and slope creep. Free imagery, revisit times of days, used by ICIMOD and national agencies.
Water-level sensors
Pressure transducers and radar gauges at lakes and rivers, logging levels and triggering alerts when thresholds are crossed.
Geophones & tripwires
Seismic sensors detect the ground vibration of a debris flow kilometres upstream; tripwires across channels are a cheap mechanical backup.
Weather radar & rain gauges
Nowcasting extreme rainfall over small mountain catchments, where floods build in under an hour.
Drone photogrammetry
Post-event mapping of debris fans, damaged bridges and changed river courses at centimetre resolution.
Satellite internet terminals
Starlink-class terminals keep monitoring stations and field teams connected where fibre and towers are gone.
Early warning & communication
Getting a detection turned into people moving, in minutes.
Siren networks
Village sirens triggered automatically by upstream sensors or manually by a warden — the system that saved valleys in Bhutan.
Cell-broadcast alerts
Government-pushed messages to every phone in a defined area, no app or subscription needed. Used for earthquakes and floods worldwide.
SMS & shortwave bulletins
For valleys with no data coverage: warning and shelter info via SMS gateways and shortwave radio.
Community radio
Local FM stations relay warnings in local languages and stay on air when national networks fail.
Satellite messengers
Garmin inReach-style beacons let trekking groups and remote posts send SOS and status without any terrestrial network.
Loudspeaker & flag systems
Low-tech but proven: designated wardens with loudhailers and pre-agreed signals as the last-mile fallback.
Modelling & mapping
Software that turns terrain and water data into decisions.
Hydrodynamic models
HEC-RAS and similar tools simulate how a dam-breach wave moves down a valley — arrival time and depth at every settlement.
Inundation & hazard maps
Modelled flood footprints made legally binding for building permits, so schools and clinics are not built in the flood path.
Lake hazard scoring
Standardised scoring of dam type, freeboard, slope instability and downstream exposure to rank which lakes get instruments first.
Digital elevation models
ALOS and Copernicus DEMs are the base layer for every flood model; drones refine them locally.
Open data platforms
Portals like ICIMOD's Regional Database System publish lake inventories and hazard layers for anyone to use.
AI change detection
Machine learning on satellite time series flags lakes that grew or slopes that started creeping, at scales no analyst team can cover manually.
Structural & engineering
Physical measures that reduce the hazard at source.
Lake lowering
Siphons, controlled channels or pumped drawdown cut lake volume by 3–20 m. Reference projects: Tsho Rolpa and Imja Tsho in Nepal.
Moraine reinforcement
Armoured spillways, riprap and grouted outlets stop a dam from incising once overtopping starts.
Check dams & debris basins
Structures in the channel that trap boulders and sediment before the surge reaches bridges and towns.
Sediment-tolerant design
Higher single-span bridges and hydropower intakes with bypass sluices that survive a debris-laden surge.
Relocation & safe siting
Moving the most exposed settlements to ground above the modelled flood line — the only measure with a 100% success rate.