Download coordinates as: The Tagus-Segura Water Transfer (Spanish: Trasvase Tajo-Segura) is one of the largest works of hydraulic engineering ever produced in Spain.

Although it was mentioned as early as 1902, the origin of the transfer system dates back to 1932, when the Minister of Public Works Indalecio Prieto entrusted engineer Manuel Lorenzo Pardo [es] with the formulation of a plan for the management of national water resources.

The transfer system project was resumed through the Ministerial Order of July 30, 1966, which commissioned the drafting of the Anteproyecto General del Aprovechamiento Conjunto de los Recursos Hidráulicos del Centro y Sureste de España, Complejo Tajo-Segura (General Proposal for the Joint Management of Hydraulic Resources in Central and Southeastern Spain, Tagus-Segura System).

This task is accomplished by the reversible pumped-storage plant Bolarque II, which relies on four vertical generator assemblies with their corresponding Francis pump-turbines, capable of pumping 66 m3/s (2,300 cu ft/s).

These changes, while maintaining the source basin's precedence and respecting the specifications of its resource planning, are meant to improve system management by establishing a set of impartial technical standards to eliminate previous insecurities and to provide objective, straightforward criteria for operation.

Assigned when the total water supply in Entrepeñas and Buendía does not exceed, at the beginning of the month, the values shown in the following table: At this level, which constitutes an irregular hydrological situation, the relevant agency shall authorize at its discretion and with valid justification a transference of up to 20,000,000 m3 (16,000 acre⋅ft).

To promote the development of riverside communities, priority will be given to the headwater reservoirs for the holding of authorized transfers pending distribution, before the intermediate and terminal basins, as long as this practice conforms to a reasonable and cohesive use of the whole system.

According to estimations made by PwC in 2013,[9] the food and agriculture industry linked with the Tagus-Segura Water Transfer brings in a GDP of 2,364 million euros and more than 100,000 jobs, if commercialization and processing activities are included.

With respect to this controversy, Melgarejo et al. observe: "Thirty years after the commission of the Tagus-Segura Aqueduct, it's hard to understand why its use still hasn't been normalized, and why the distribution of water is still in question.

"[11] The official launching of the Tagus-Segura Water Transfer made intensive farming possible in the Spanish southeast, consequently placing the region among the largest European outdoor producers of out-of-season crops.