Hazard overflow of rivers — TRI Lille

The implementation of the Flood Directive aims to establish a framework for flood risk assessment and management at the level of the Artois — Picardy basin while prioritising state intervention for areas with significant flood risk (TRI). Flooding of the Lys and its tributaries for a return period 10 years (high proba.), 100 years (medium proba.) or 1000 years (low proba.): the event has a 10, 100 or 1000 probability of occurring each year on the Lille TRI.