Where some kind of water market can be developed that reflect the income produced by infrastructure improvements, the burdens of searching for external finance can be reduced. Important data needs would focus on assembly of detailed cost and return enterprise budgets for irrigated agriculture that account for financial and economic impacts of greater water supply and increased water supply reliability. Other important data needs would focus on the cost and productivity of measures that would maintain dams, canals, pipelines, aqueducts, pumping plants, drainage and flow regulating structures. Improvements in models of water supply and demand in alternative uses would be even more valuable.