Wathersheds of Tacana originate on the volcano, with both shared by Guatemala and Mexico. This region is of great strategic importance for both countries since they supply water to a large number of residents in the cities located downstream and are the main source of irrigation water for agriculture. In the lower reaches, fishing is an important source of income.
Egypt’s water resources are severely constrained. This calls for increasing the water use efficiency by improving irrigation management practice, as the agriculture sector is the main user of water resources. To address the issue, an Irrigation Improvement Programme was initiated, including a combination of technical changes and infrastructure investment. The case clearly demonstrates the importance of building appropriate institutional structures in parallel to the introduction of technical changes.
For centuries the Upper Guadiana Basin has been irrigated with groundwater, resulting in a drop in the water table of more than 20 meters. Actions were taken to address this issue, including regulations restricting aquifer abstraction and economic incentives to encourage farmers to improve irrigation efficiency and plant alternative crops. The key lesson learnt is that surface and underground waters cannot be managed separately.
The Upper Guadiana Basin provides a classic example of conflict caused by the intensive use of water resources in a semiarid region. Since the 1960s, uncontrolled abstraction of groundwater to provide water for crop irrigation in the area has lowered the water table in places by up to 50m, causing the main river channels to run dry and some wetlands to become desiccated. On the other hand, the abstraction has also supported a booming agricultural economy.
In Ukraine, reforms in the sector of water supply and sanitation have focused on centralising water supply and sanitation. Efforts have been made to decentralise water management, delegate to local authorities as well as increase supply in rural areas. This has been done through awareness campaigns, capacity building and innovative techniques of wastewater reuse. The key lesson learnt from this case is that IWRM principles need to be considered when planning for water infrastructure.
After the USSR was dissolved, Romania has experienced water scarcity for agriculture. The World Bank and USAID are providing loans/funds for irrigation projects and to strengthen water users associations. This case thus illustrates that irrigation subsidies may be needed to support agriculture until farming efficiency improves and returns from the sale of agricultural products can cover costs.
In Australia, a new approach to water management was needed to allow imported water to be used for irrigation without increasing the salinity of the soils or groundwater. Action was taken to develop a framework to enable irrigators to identify and to manage the environmental risks associated with the use of River Murray water for irrigation. The key lesson is that a salt management strategy is relevant wherever there are plans to irrigate land.
The Yangtze River Basin has been severely affected by climate change. To address this, the Yangtze River Basin Climate Change Vulnerability and Adaptation Report has been drafted to evaluate the impact on representative ecosystems and water resources, and pinpoint adaptation strategies. The experience has demonstrated that good adaptation measures should consider not only climate itself, but also other factors, such as economy, technology, as well as social and cultural norms.
Hebei has only met water demand through overdraft of deep groundwater, resulting in the formation of a groundwater overdraft depression. This issue is further exacerbated by saline water intrusion into the groundwater tables. The water administrative department has taken measures accounting for IWRM principles, for example by establishing the Water Users Association to encourage participatory management. The lesson learnt is the value of a participatory approach in management.