Abstarct: Land use change is one of the most significant human activities impacting hydrological cycle components, runoff, and especially flooding. In this context, the present study aims to assess the impact of land use changes on various flood components across different return periods using the SCS model over a 30-year period in the Ramian watershed in Golestan Province. For this purpose, land use maps were prepared using Landsat satellite images for the years 1991, 2006, and 2021, classified into categories such as forest, rangeland, rain-fed agriculture, irrigated agriculture, orchard, and residential areas using the maximum likelihood method. The CumFreq software was then employed to calculate the maximum 24-hour rainfall for return periods of 2, 5, 10, 25, 50, and 100 years. Subsequently, the flood hydrograph was simulated on an hourly time scale using the SCS model, and baxse time, time to peak, peak discharge, and flood volume were calculated and analyzed for the mentioned years and return periods. The results indicated a decrease in forest and rangeland areas and an increase in agricultural, orchard, and residential land uses during the study period. The findings revealed a nonlinear and direct relationship between return period and rainfall amount in the study area. Curve numbers in the Ramian watershed for rain-fed agriculture, forest, irrigated agriculture, orchard, rangeland, and residential areas were calculated as 78, 30, 66, 67, 54, and 84, respectively. baxsed on the results, in return periods greater than 5 years, a reduction of approximately 20 minutes in time to peak has occurred in recent years. The peak flood discharge in the 5-year return period increased from 94.89 m³/s in 1991 to 121.20 m³/s in 2021. The percentage change in flood volume across different return periods decreases as the return period increases. The reduction and management of flood-related damages can be planned according to the significance of the various flood components derived from this study.