Dr. Rai has more than fifteen years of working experience in the field of Hydrology and Water Resources Engineering. His key specialty areas are: Hydrological & Hydraulic Modelling; Sediment Modelling and Management Planning, Development of Rainfall-Runoff-Erosion Models for small and mid-sized catchments; Integrated Water Resources Planning and Management; Catchment Planning, Diversion Studies; Stormwater Drainage Design and Modelling; Irrigation and Hydropower Planning; and Planning and Evaluation of Irrigation Project.