Flood mitigation programmes and strengthening of disaster risk management and resilience of infrastructure would be further enhanced in the Eleventh Malaysia Plan and beyond. Water Security. Over 97% of the water supply is derived from surface water in rivers and reservoirs, hence management of these vital water catchment areas is crucial to ensure a reliable source of water supply. As part of forward planning on water supply requirements, a Review of the National Water Resources Study (2000-2050) was completed in 2011 and a National Water Resources Policy was formulated in 2012.