Kangwon province has been suffering from the various types of disasters and these disasters stand In the way to sustainable development. The heavy rainfall by typhoon RUSA in 2002 damaged to property and bodily injury, and gave us a lesson. Even if the refuge activities plan by local government plan for disaster were established with rainfall event, it could not its role in practice. Beside it, the potential disaster risk remains still in existence because the disaster restoration work aims to original state. Therefore, in this study we focused on the point at issue of developing in upper area and its impact on discharge hydrograph.