In order to meet the needs of adequate water infrastructure, high quality hydrological data is required. The distribution of rain station in a region can affect the level of error in hydrological data. Evaluating the number of rain stations using stepwise and WMO standards method in Indragiri Watershed AWLR Rengat and Indragiri Watershed AWLR Japura. The Indragiri Watershed AWLR Rengat has …