Why and When Water Accounting Matters : A Guidance Note for Operational Task Teams

Overview & Synopsis

Increasing intersectoral competition for limited freshwater, poverty and WASH gaps, and escalating climate risks challenge water resource planning. Symptoms include scarcity, unreliable access, declining quality, groundwater overdraft, and ecosystem degradation, all intensified by climate change. Interventions can produce unintended outcomes when information and assessment frameworks are weak: water may be reallocated away from existing users, “savings” may not materialize, consumption and pumping can rise, return flows and leaks can be double counted, and informal, ecological, and environmental uses can be ignored, often worsening impacts on poor and vulnerable groups. Water accounting helps avoid these pitfalls through systematic, quantitative tracking of water availability, storage, withdrawals, consumption (evaporation/ET), return flows, and sectoral uses within a defined domain. It provides a common framework and language that improves transparency, supports integrated water resources management, and strengthens allocation, policy, and investment decisions. This Guidance Note for World Bank staff and partners explains why and when water accounting is useful for projects in water for food and fiber, river basins, urban water supply, and environmental and ecosystem services. It introduces core concepts, notes the value of tools like Earth observation, and emphasizes institutionalizing water accounting systems - alongside capacity and infrastructure investments to enable long-term monitoring and climate resilience.