The drainage system is one of the most important factors to be considered in the urbanrndrainage infrastructure plan. Now inadequate urban stormwater drainage problemsrnrepresent one of the most common sources of compliant numerous towns of Ethiopia.rnDrainage problem in mojo town the worst issue of over flooding on the surface runoff atrnhigh rainfall season. This difficulty occurred due to inadequate drainage networkrninfrastructure and the increase in the urban pavement on most urban sub-catchments. Thernobjective of this study to identify the critical condition and related problem with a drainagernsystem, assess the hydraulic performance of stormwater drainage infrastructures, and tornevaluate alternatives for drainage problem mitigation measures are achieving this specificrnobjective SWMM5.1 model and LID control was used in the study. The calibration andrnvalidation of the SWMM5.1 model well-done and its performance was tested by therngoodness of fit using the coefficient of determination (Rrn2rn) =0.97, the Nash â€“Sutcliffe rncoefficient (NSE) =0.96, and Relative error (RE) =11.16%. The simulated area of the studyrnsubdivide to four outlets of the total area of sub-catchment is 745.2ha joint to drainagernsystem infrastructure of 93 nodes, 101 channels, and one divider are simulated by SWMMrn5.1 model. From model result greater than 60% of drainage infrastructure is flooded, at thernoutfall total sub-catchment runoff is 6.88mrn3rn/s average flow, 22.44mrn3rn/s maximum flow and rn3rn583.07*10rn3rn mrn total volume of all outfall. The LID control used in this study for reduced rnthe peak runoff overflow and select the best alternative on the outlet one of the project inrnthe same sub-catchment S1, S2, S3, S5, S6, S9, S10, and S12 were the reduced the totalrnoutlet one volume by 28.12% using bio-retention Cell scenario, 25.9% infiltration trenchrnscenario, 26.71% using permeable pavement scenario and also on sub-catchment reducedrntotal volume outfall one reduced by 3.02 % using vegetation swale scenario. All scenariosrnused two of the highest value of runoff decreased by Bio-retention Cell scenario andrnpermeable pavement for total study applied. by using two selected Lid control total volumernof all outfall from 583.07*10rn3rn3rn mrn is reduced to 425.89*10rn3rn3rn mrn by 36.92% from the total rnstudy. Generally, the mojo town urban drainage system performance infrastructuresrnoverflow assessed and controlled for the problem occurred using the best alternativernmitigation measures by improved LID control for all study areas.