Migration shapes the lives of those who move and transforms the geographies and economies of their points of departure and destinations alike. The water sector, and the availability of water itself, implicitly and explicitly shape migration flows. Ebb and Flow, Volume 1. Water, Migration, and Development presents new global evidence to advance our understanding of how fluctuations in water availability, as induced by rainfall shocks, influence internal migration, and hence regional development. It finds that cumulative water deficits result in five times as much migration as water excess does. But there are important nuances in why and when these events lead to migration. Where there is extreme poverty and migration is costly, water deficits are more likely to trap people than induce them to migrate.

Water shocks can also influence who migrates. Workers leaving regions because of water deficits are often less advantaged than typical migrants and bring with them lower skills, raising important implications for the migrants themselves and receiving regions. Cities are the destination of most internal migrants, but even here, water scarcity can haunt them. Water shortages in urban areas, which lead to so-called day zero events, can significantly slow urban growth and compound the vulnerability of migrants.

No single policy can be completely effective at protecting people and their assets from water shocks. Instead, the report puts forth a menu of overlapping and complementary policy options that target both people and places to improve livelihoods and turn water-induced crises into opportunities for growth. A key message is that policies that focus on reducing the impacts of water shocks must be complemented by strategies that broaden opportunities and build the long-term resilience of communities. Doing so will give individuals more agency to determine the best outcome for themselves and to thrive wherever they may choose to locate.

The Middle East and North Africa Region encapsulates many of the issues surrounding water and human mobility. It is the most water-scarce region in the world and is experiencing unprecedented levels of forced displacement.

Ebb and Flow: Volume 2. Water in the Shadow of Conflict in the Middle East and North Africa examines the links between water risks (harmful outcomes related to water, from droughts and floods to lack of sanitation), conflict, and forced displacement. It aims to better explain how to address the vulnerabilities of forcibly displaced persons and their host communities, and to identify water policy and investment responses. Contrary to common belief, the report finds that the evidence linking water risks with conflict and forced displacement in the region is not unequivocal. Water risks are more frequently related to cooperation than to conflict at both domestic and international levels. But while conflict is not necessarily a consequence of water risks, the reverse is a real and concerning phenomenon: conflict amplifies water risks.

Since 2011, there have been at least 180 instances of intentional targeting of water infrastructure in conflicts in Gaza, Libya, the Syrian Arab Republic, and the Republic of Yemen. Forcibly displaced persons and their host communities face myriad water risks. Access to safe drinking water is a daily struggle for millions of forcibly displaced Iraqis, Libyans, Palestinians, Syrians, Yemenis, and international migrants in the region, heightening public health risks. Tanker trucks often help fill the gap; however, significant issues of water quality, reliability, and affordability remain.

Host communities also face localized declines in water availability and quality as well as unplanned burdens on water services following the arrival of forcibly displaced persons. The reality of protracted forced displacement requires a shift from humanitarian support toward a development approach for water security, including structured yet flexible planning to deliver water services and sustain water resources for forcibly displaced persons and their host communities.