Satellite detected water extents between 16 and 20 August 2024 over Far-North Region, Cameroon

**UNOSAT code: FL20240821CMR** This map illustrates cumulative satellite-detected water extent in Farth-North Region, Cameroon between 18 to 22 September 2024. Within the cloud free analysed areas of about 34,000 km², a total of about 6,000 km² of lands appear to be affected with flood waters. Water extent appears to have increased of about 1,800 km² since the period between 16 to 20 August 2024. Based on Worldpop population data and the maximum flood water extent, ~415,000 people in Far-North Region are potentially exposed or living close to flooded areas, amongst which ~270,000 people in Logone-et-Chari Department and ~125,000 people in Mayo-Danay Department. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20191017CMR** This map illustrates satellite-detected surface water in Mayo-Danay and Logone-et-Chari Department, Far-North Region of Cameroon as observed from Sentinel-2 imagery acquired on 16 October 2019. Within the analysed extent of about 2,500 km2, a total about 211 km2 of land appear to be flooded. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR - UNOSAT.

**UNOSAT code: FL20191017CMR** This map illustrates satellite-detected surface water in Mayo-Danay and Logone-et-Chari Department, Far-North Region of Cameroon as observed from Sentinel-2 imagery acquired on 11 October 2019. Within the analysed extent of about 7,200 km2, a total about 1,500 km2 of land appear to be flooded. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR - UNOSAT.

**UNOSAT code: FL20240820TCD** This map illustrates cumulative satellite-detected water using VIIRS in Chad between 31 August to 04 September 2024. Within the cloud free analysed areas of about 900,000 km², a total of about 22,800 km² of lands appear to be affected with flood waters. Maximum flood water extent appears to have increased of about 3,900 km² since the period between 20 to 24 August 2024. Based on Worldpop population data and the maximum flood water extent, about 820,000 people are potentially exposed or living close to flooded areas. Amongst which ~145,000 people in Logone Oriental Region and ~90,000 people in Mayo-Kebbi Est Region. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20240902NGA, GDACS ID: 1102720** This map illustrates cumulative satellite-detected water using VIIRS in Nigeria between 5 to 9 September 2024. Within the cloud free analyzed areas of about 815,000 km², a total of about 14,000 km² of lands appear to be affected with flood waters. Based on Worldpop population data and the maximum flood water extent, about 2,650,000 people are potentially exposed or living close to flooded areas. The pixelwise water fraction from VIIRS, using a 5-day composite at 375 m spatial resolution, indicates potential floodwater coverage ranging from 0% to 100%. This large-scale analysis is intended for guidance purposes and has not yet been validated with ground truth data or higher-resolution analysis. The population exposure analysis is based on floodwaters observed only in cloud-free areas, so the total number of people exposed may be underestimated. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20240820TCD** This map illustrates cumulative satellite-detected water using VIIRS in Chad between 20 to 24 August 2024. Within the cloud free analysed areas of about 1,200,000 km², a total of about 18,900 km² of lands appear to be affected with flood waters. Maximum flood water extent has remained relatively stable, with a decrease of about 500 km² since the period between 15 to 19 August 2024. Based on Worldpop population data and the maximum flood water extent, ~170,000 people in Mayo-Kebbi Est Department, ~160,000 people in Logone Oriental Department and ~120,000 people in Tandjilé This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).