What the future has in store: a new paradigm for water storage

The natural water storage systems that people have historically relied upon - glaciers, wetlands, soil moisture - are in decline or being disrupted. At the same time, investments in built storage have not kept pace with population growth, and though society is adding new reservoirs and other types of water retention structures, per capita reservoir storage is in decline due to sedimentation and lack of maintenance. These trends add up to a growing water storage gap that must be tackled to enable a water-secure world for all. This report unpacks the importance of storage, recent trends in the availability of storage, and sets forth a new integrated planning framework to guide water managers through a problem-driven and systems-oriented process to understand the options available to them to meet their water security goals and how the different forms of water storage can be part of the solution. This new approach fits within border Integrated Water Resources Management with a focus on concurrent joint planning. Finally, the report lays out the conceptual shifts that are required to meet this mounting challenge and provides case studies from different countries where integrated approaches to planning and operating water storage investments have been tried with success.