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This study aims to determine land use change and runoff using the USDA Soil Conservation Service curve number (SCS-CN) method for Chaka block, located at 24o 47'00"N to 25o 47'00"N North latitude and 81o 19'00"E to 82o 21'00"E longitude, situated at Allahabad district, Uttar Pradesh .Antecedent moisture content (AMC) was calculated by taking preceding five days rainfall which gave three conditions AMC I, AMC II and AMC III. Weighted Curve Number for the entire selected micro-watershed was calculated based on site information of the block and found to be 78 for AMC II. The CN values corresponding to AMC I and AMC III were 59.82 and 89.08 respectively. The runoff for each storm events was estimated following Curve Number method and it is found that among the selected storm events maximum rainfall of 203 mm occurred in September 1, 2000 generating 169.89 mm of runoff. Runoff volume of the micro-watershed for each storm events were also calculated and maximum runoff is found is 26.09million m³. This value will be useful for design of soil and water conservation structures in block. The simulation of runoff events it is observed that the value of estimated runoff and simulated runoff