The economic value of six key ecosystem services in the Ayeyarwady Basin - agriculture, transport, fisheries, water supply, biodiversity and ecotourism - is estimated in the range of USD 2.5 to USD 6.9 billion per annum (between 3-9% of total GDP for 2016). In building this assessment with colleagues in Myanmar, Jim Binney from Natural Capital Economics in Brisbane, Australia was pleased to establish this insight as part of the rationale for tackling the complexity of water resources, the natural environment and challenges facing a sustainable future for the Ayeyarwady Basin. In particular the high worth of the river flows in the Ayeyarwady Basin means that planning and management must consider these values and to help this discussion, the team from Alluvium and Natural Capital Economics share some experienced principles on system flows for Myanmar.