The OKACOM TDA methodology
•an analysis that linked water resource uses to river flows and ecological impacts, and then translated those impacts into economic terms.  
•De facto current and potential future allocations of the water resource were explored through three water use alternatives.
•The current economic value of the use of the water resource was estimated in each country based on conservative and optimistic projections of the potential value of the different activities.
•the analysis of changes to the flow regime (IFA) under each projection was used to assess how existing water uses and new water supply, hydropower and irrigation uses would lead to increases or decreases in economic value derived from the river.
1.Can we estimate what the impacts would be? The TDA
2.Who will gain who will lose and how much?
In this fashion the economic tradeoffs for each country of different levels of water withdrawals are made explicit.