Preliminary Flood Analysis of Bayelsa State, Nigeria, using radar satellite data acquired on 16, 21, 22, 28 September and 03 October 2018 11 October 2018 SUMMARY UNITAR – UNOSAT has produced an estimation of the potential affected population and area by flood extent over Bayelsa State, Nigeria, using Worldpop data (2015 UN adjusted). The flood extent is illustrated by a analysis of the evolution of satellite-detected surface waters, based on satellite data recorded on 16, 21, 22, 28 September and 03 October 2018 (Sentinel-1, resolution 10m). Download excel table from here 2 Flood Extent over Brass, Bayelsa State, Nigeria 3 Flood Extent over Ekeremor, Bayelsa State, Nigeria 4 Flood Extent over Kolokuma / Opokuma, Bayelsa State, Nigeria 5 Flood Extent over Nembe, Bayelsa State, Nigeria 6 Flood Extent over Ogbia, Bayelsa State, Nigeria 7 Flood Extent over Sagbama, Bayelsa State, Nigeria 8 Flood Extent over Southern Ijaw, Bayelsa State, Nigeria 9 Flood Extent over Yenegoa, Bayelsa State, Nigeria 10 Bayelsa State, Nigeria – Flood Extent as of 16 September 2018 11 Bayelsa State, Nigeria – Flood Extent as of 16 September 2018 12 Bayelsa State, Nigeria – Flood Extent as of 21 September 2018 13 Bayelsa State, Nigeria – Flood Extent as of 21 September 2018 14 Bayelsa State, Nigeria – Flood Extent as of 22 September 2018 15 Bayelsa State, Nigeria – Flood Extent as of 22 September 2018 16 Bayelsa State, Nigeria – Flood Extent as of 28 September 2018 17 Bayelsa State, Nigeria – Flood Extent as of 28 September 2018 18 Bayelsa State, Nigeria – Flood Extent as of 03 October 2018 19 Bayelsa State, Nigeria – Flood Extent as of 03 October 2018 20 OBSERVATIONS . A national flood had been declared by the Government of Nigeria on 18 September 2018 ; . According to the Worldpop data and the satellite-detected waters from Sentinel-1 images, from 16 September to 03 October 2018, the total population affected by the floods approximately rose from 105,000 to 145,000 ; . The four most affected Local Government Areas (LGA) are Brass, Kolokuma/Opokuma, Sagbama and Yenegoa, as of 03 October 2018 ; . This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR – UNOSAT. 21 UNITAR Operational Satellite Application Programme (UNOSAT) Contact information: www.unitar.org/unosat [email protected] T +41 22 767 4020 United Nations Institute for Training and Research Institut des Nations Unies pour la formation et la recherche Palais des Nations, CH-1211 Instituto de las Naciones Unidas para Formación Profesional e Investigaciones Geneva 10, Switzerland Учебньıй и научно-исследовательский институт T +41 22 917 8400 Организации Объединенньıх Наций F +41 22 917 8047 www.unitar.org معهد اﻷمم المتحدة للتدريب والبحث 联合国训练研究所 22.