Data for pluvial flood risk assessment in rural settlements of the Dosso Region, Niger

This dataset contains information for a participatory pluvial flood risk assessment in four rural settlements of the Dosso Region, Niger. Based on the ISO 31010 standard for risk management-risk assessment, hydraulic modelling was used to ascertain flood-prone zones for each settlement in order to identify the assets in flood-prone zones. Risk reduction measures were then proposed. Risk evaluation (residual risk and benefit-cost analyses) completes the risk assessment. This dataset contains 9 tables and 6 figures: Table 1 - Daily rainfall for each return period considered and for each settlement; Table 2 - Pluviometrical data series for each settlement and the probability distribution functions used to determine the return periods; Table 3 - Average runoff coefficient of each watershed at different return periods and in the two scenarios (before treatment, after treatment); Table 4 - Soil roughness for each land cover as defined by the Manning coefficient; Table 5 - Assets exposed to flood risk according to very probable, probable, and improbable flood zone (as a future building expansion scenario); Table 6 - Cost comparison between substitution of assets and risk reduction measures; Table 7 - Monetary values for pluvial flood risk in RP3 and RP20 baseline conditions (before treatment) for each settlement; Table 8 - Monetary values of risk and residual risk in RP3 and RP20 scenarios for each settlement; Table 9 - Damage reduction benefits and risk treatment costs for each settlement; Figure 1 - Flowchart of the adopted method; Figure 2 - Regional framework of Dosso with the four settlements location; Figure 3 - Forms and parameters used in the hydraulic model; Figure 4 - Exposed assets in RP3 and RP20 flood-prone zones for the settlement of Gagila; Figure 5 - Pictograph of proposed risk reduction measures; Figure 6 - Risk reduction measures localisation in the upstream catchment of Tessa