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Reservoirs

El Moro Reservoir

Purpose.

Phenomena such as torrential rains or floods are well known in the Segura River Basin. The damages caused by water have been a historic concern for the inhabitants of the area from the point of view of economic and human losses.

In response to this situation, in 1977, and under the direction of the Chief Engineer of the Operations Department at the time, Mr. José Bautista Martín, the General Flood Protection Plan was drawn up, in which, amongst other works, a retarding basin was included in the Rambla del Moro.

Rambla del Moro forms part of a system of wadis that end in the Segura river on the left bank in its middle stretch. They are basically characterized by their zero flows all year round except for specific occasions when they evacuate significant volumes.

The function of the dam is that of preventing floods in the basin, characterized by some episodes of very intense rainfall during very short periods of time.

With the construction of this dam peak flows are avoided, which would be added to those of the Segura river in the event of a generalized heavy rainfall in this river basin, and, on the other hand, the risk of floods in the huerta area of Abarán would also be reduced, in the event of heavy rainfall in the Rambla del Moro basin.

The Rambla del Moro Reservoir has a height of about 32.15 m on the bed and 43.30 m on foundations, and a crest length of about 104 m. It is a gravity dam with an irregular ground plan, and its abutments face slightly upstream. The orientation is different for each of them, being 7º for the right abutment and 17º for the left one (measured with regard to the normal one of the bed). The slopes of the downstream and upstream faces are, respectively, 0.05H/1V and 0.76H/1V.

Detail of El Moro Reservoir

The irregular layout of the dam ground plan is because it was designed meaning the whole base of the dam foundations had to be built on the narrow layer of folded dolomites that crosses the ravine with a dip of about 45º downstream, caused by the overthrusting of the Miocene by the Triassic.

Detail of El Moro Reservoir

The transversal joints that make up the twelve dam blocks are not laid out in a regular way, i.e., the blocks have different widths, the largest being the two central ones measuring 14 m each, while the remaining ones are of various measurements of between 7 and 9.25 m.

Detail of the Cross-section showing the cut-off and consolidation wall, consolidation mesh and chimney drain
Cross-section showing the cut-off and consolidation wall, consolidation mesh and chimney drain.

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