1.2 Climate change adaptation considerations built into integrated river basin management planning initiatives of Sri Lanka. 2023. 1.3 Water resource development and management plans for the selected 15 river basins are prepared. 2030. 1.4 Integrated River Basin Management (IRBM) plans are prepared (by 2025) for at least five critical river basins and implemented (Five basins identified are Yan Oya, Mi Oya, Malwathu Oya, Gin Ganga and Nilwala Ganga). 2030.