REALTIME GUIDANCE FOR FLASH FLOOD RISK MANAGEMENT

Two approaches are currently available for flash flood forecast: i)distributed or semidistributed rainfall-runoff model, able to use distributed rainfall input and to exploit information about basin morphometry ii)simple procedures based on the concept of Flash Flood Guidance, i.e. the approximate threshold basin-average rainfall depth over a given duration that would cause a small stream to begin flooding.This Task provides guidelines on: i) effectiveness of use either rainfall-runoff model or simple threshold procedure for flash flood forecasting ii) worth of use rainfall-runoff model to further specify the flood potential.