Urbanization of an area invariably leads to increase in overall imperviousness of the area. Whenrnland becomes impervious,stormwater will stagnate on the surface thereby affecting therninfrastructure, transportation and causing inconvenience to general populace. Stormwater drainagernproblem is one of the major challenges facing many countries in Ethiopia in general and Alamatarntown also faced the problem. This study has investigated the overall challenges of the stormwaterrndrainage system in Alamata town.Rapid expansion of built environment, poor urban drainagernmanagements and location of Alamata town being at the foothills of mount Gra-Kahsu are thernmajor problems in the study area. The objective of this study is to evaluate the current stormwaterrndrainage systems and associated problems. This research involves collection of both primary andrnthe secondary data and the collected raw data was edited, coded, classified, and tabulated in orderrnto make it ready for analysis. Furthermore, spatial analyses was conducted using Arc GIS, BentleyrnFlow master, Google Earth pro, and Auto CAD softwareâ€™s as analytical tools. The land use landrncover image was processed for the years 2008 and 2018 by using Arc GIS.10.4.1 and Google earthrnpro then for each land use/land cover, annual stormwater runoff volume was calculated and digitalrnchange detection were evaluated. The results indicate that Annual runoff volume of Built -up arearnin the study area has increased from 162129.6mrn in 2018 which accountsrnfor 13.35% of the total Annual runoff volume. The Vegetation has decreased from 15616.8mrn3rn in 2008 to 183772.8 mrn3rn inrn2008 to 4568.4mrn3rn in 2018 which accounts for 70.75%. The Bare Land area has increased fromrn8286.3mrn3rn3rn in 2018 which accounts for 153.08%. The existing depth andrnwidth of the stormwater drainage channel were measured for all sub catchments of the town andrnused to determine the existing drainage capacity using Bentley Flow master. The hydrologicalrnanalysis was computed by the SCS method and rational method. The computed discharge values,rnwhich were determined by both SCS method and rational method, were compared by dividing thernwatershed area according to their area of application. The existing condition drainage channelrndepths of sub-catchments 6,7 and 8 Increase by 68.40%, 160.20% and 121.07%; and the widthsrnby 55.44%, 116.83% and 100.98%, and the Design discharge was also 9.29mrn in 2008 to 20970.9mrn3rn/s andrn9.13mrn3rn3rn/s, 16.47mrn3rn/s respectively.