In Ethiopia, the recent urban expansion and increment of impervious surfaces in high rainfall rnareas resulted in flooding and associated environmental problems. Nekemte city is one of the rnurban centers in the country facing the challenges associated with a high level of rnimperviousness and flooding. This study mainly focused on estimating the level of impervious rnsurfaces and introducing nature-based drainage design solutions for sustainable stormwater rnmanagement of the city by targeting water-resilient strategies for the future of Nekemte. Spatial rndata collected and processed by using ArcGIS for mapping & quantification of impervious rnsurfaces eventually for calculating stormwater runoff generated from the most impacted rnwatershed. None spatial data collected to understand the perception of local people about the rnsituation of flooding using questionnaires, structured interviews, observation & focus group rndiscussions. Published and unpublished documents from the municipality of Nekemte and rnplanning institutes utilized for verification of both spatial and non-spatial data. The collected rnprimary data analyzed statistically under SPSS version 20. The principal result of this research rnshowed that factors enabling flooding problems are the sum of factors associated with rnimpervious surface increments, intensive recurrent rainfall in the area, densification of rnsettlements in the higher slopes, and inadequate drainage facilities for stormwater management. rnBased on this factor, the watershed that covers the area around Bake Jama and nearby rnneighborhoods estimated to be 201.06ha watershed area identified as the most impacted with rn95.77ha of impervious surface coverage. The problem associated with imperviousness in this rnparticular watershed can be reduced by retrofitting through the application of nature-based rndrainage solutions using the available open spaces and public realms. The study also developed rnwatershed level strategies applicable in different parts of the city with similar flooding rnproblems. Finally, the study recommended further assessment of the socio-economic aspect of rnflooding in the area to link the nature-based drainage solutions with more co-benefits for the rnlocal people affected by flooding. In this regard, the designed nature-based solutions as a blue green system have the potential for creating more jobs and income for the local people through rnwater harvesting and urban farming schemes