This system overview provides a comprehensive guide to the National Reservoir Inflow Forecasting System (NaRIF). NaRIF is a forecasting tool specifically developed to address dam-related flood risks, with its initial implementation as a pilot project at Batu Dam. The system provides reservoir water level forecasts, enabling dam operators to make informed decisions for safe reservoir operation and downstream flood risk mitigation. This system represents a critical advancement in national disaster preparedness and dam management.