Satellite detected water extent in N'Djamena department, N'Djamena Region, Chad as of 20 October 2022

**UNOSAT code FL20221019TCD** This map illustrates satellite-detected surface waters in N'Djamena Department, N'Djamena Region, Chad as observed from a WorldView-2 image acquired on 24 October 2022 at 10:38 local time. Within the analyzed area of about 300 km2, about 38 km2 of lands appear to be flooded and 14,799 structures are potentially affected by the floods. Based on Worldpop population data and the detected surface waters, about 154,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

**UNOSAT code FL20221019TCD** This map illustrates satellite-detected surface waters in N'Djamena Department, N'Djamena Region, Chad as observed from a Pleiades image acquired on 21 October 2022 at 10:35 local time. Within the analyzed area of about 500 km2, about 68 km2 of lands appear to be flooded and 13,323 structures are potentially affected by the floods. Based on Worldpop population data and the detected surface waters, about 228,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

**UNOSAT code FL20221019TCD** This map illustrates satellite-detected surface waters in N'Djamena and Chari Departments, Chad as observed from a Kanopus-V image acquired on 30 October 2022 at 11:26  local time. Within the analyzed area of about 570 km2, about 110 km2 of lands appear to be flooded and 19,465 structures are potentially affected by the floods. Based on Worldpop population data and the detected surface waters, about 284,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20240820TCD** This map illustrates satellite-detected water extent in N'Djamena city, N'Djamena Department, Chad as observed from a PlanetScope satellite image acquired on 26 August 2024. Within the analysed area of about 440 km², a total of about 50km² of lands appear to be affected by flood waters. Within the analysed area approximately 7,900 buildings (<3%) in Chad are affected by the floodwaters. 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 satellite-detected water extent in N'Djamena city, N'Djamena Department, Chad as observed from a WorldView-2 satellite image acquired on 08 October 2024. Within the analysed area of about 245 km², a total of about 34km² of lands appear to be affected by flood waters in Chad. Within the analysed area approximately 1,400 buildings (<5%) in Chad are affected by the floodwaters. According to the forecasted river flow data from ECMWF, as of 09 Oct. 2024, for the water gauges Chari A Chagoua and Chari A Ndjamena -Ex Fort-Lamy- along the river Chari, the current medium flow (Q2yr) has a tendency to decrease in the next 10 days with the peak likely happening on 10th Oct. 2024. 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 FL20221019TCD** This map illustrates cumulative satellite-detected water using VIIRS in Chad between 14 to 18 October 2022. Within the cloud free analysed areas of about 1,200,000 km², a total of about 24,300 km² of land appears to be affected. Based on Worldpop population data and the maximal flood water extent ~1.4 million people are potentially exposed or living close to flooded areas amongst the 16.5 million people living in the analysed zone. 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).