Lecture
This lecture explores the use of Geographic Information Systems (GIS) to assess flood risk in Niamey, a Sahelian city in Niger. It covers the challenges of flooding, the impact on people, infrastructure, and the environment, as well as the increasing frequency of floods possibly linked to climate change. The lecture discusses past flood events, the hydrological regime, and the seasonal floods affecting Niamey. It also delves into the factors exacerbating floods, such as urban sprawl in flood-prone areas and the lack of river maintenance. Strategies for flood mitigation, including riverbank improvements and flood modeling, are presented. The lecture emphasizes the importance of localized risk management based on territorial vulnerability.