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The key purpose of Joint Danube Surveys (JDS) is to produce reliable and comparable information on carefully selected elements of water quality for the length of the Danube River, including its major tributaries. Three Joint Danube Surveys have previously been conducted, in 2001, 2007, 2013, and 2019. The 5th Joint Danube Survey is due to launch on 1st July 2025.

Danube Delta, 26 September 2011. A detailed analysis and assessment of the Danube Delta will be held within the project "Joint environmental monitoring, assessment and exchange of information for integrated management of the Danube delta region" from 26 September until l 7 October 2011.

Groundwater constitutes the largest reservoir of freshwater in the world, accounting for over 97% of all freshwaters available on earth (excluding glaciers and ice caps). The remaining 3% is composed mainly of surface water (lakes, rivers, wetlands) and soil moisture. By incorporation into the Water Framework Directive (WFD), groundwater became part of an integrated water management system.