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Reservoirs

Algeciras Wadi Reservoir

History

On 20th November, 1974, the engineer José Bautista Martín published the Basic Project for the contracting of the “General Flood Control Plan of the Segura river Basin”, which was passed on 9th December, 1974.

The dam wall seen from downstream
The dam wall seen from downstream.

One of the constructions included in this General Plan was the Algeciras Wadi Reservoir, whose objective was to be the abatement of floodwaters descending from the basin of this wadi (the eastern slopes of the Sierra de Espuña).

The usefulness of this reservoir had already been highlighted in the Preliminary Project for Water Resource Diversion and Regulation in the South-East for Maximal Use of the Tagus-Segura Inter-Basin Canal (1st phase), which was passed on 9th August, 1971. In this document there was an explanation for the need to construct a regulating reservoir for the main canal on the right bank in the Algeciras wadi. It was predicted that this reservoir would make it possible to reduce the capacity of the canal to only 10 m³/sec, and increase the capacity of the Ojós dam to this adjusted flow volume, thus bringing about a saving of approximately 40% in the facility as a whole.
 

View of scour outlet. Howell-Bunger valves
View of scour outlet. Howell-Bunger valves

Therefore both the strategic location of this reservoir, overlooking the irrigable area of the Guadalentín Valley, and the fact of its being placed at the exact altitude in order to be able to fill it with the least elevation possible, are key factors. Taken together with its capacity, which is sufficient to help out with surface irrigation needs during the summer, these factors make the Algeciras Wadi Reservoir a key element in the whole irrigation network of the right bank of the main canal.

In order to comply with the orders received, the PROJECT FOR THE ALGECIRAS WADI RESERVOIR, MUNICIPALITY OF ALHAMA DE MURCIA (MURCIA) was published, its main aim being to create defence against floodwaters heading downstream, and in doing so to reduce and delay the heaviest flooding. Additionally, it would have the function of storing and regulating the flow volume transported in the Right-Bank Canal.

This Project was technically and definitively passed by Ministerial Order on 9th September, 1990. After being opened up to tender by Ministerial Order, the works were awarded on 19th April, 1991, beginning on 22nd June 1991.

In April, 1993, AMENDED PROJECT I was published. It was technically and definitively passed by the Directorate General for Hydraulic Works on 11th February, 1994.

ADDITIONAL WORK PROJECT I was technically and definitively passed by the Directorate General for Hydraulic Works on 11th February, 1994.
 

The dam wall seen from downstream
The dam wall seen from downstream.

In October, 1994, AMENDED PROJECT I of the referred works was published. It was technically and definitively passed by the Directorate General for Hydraulic Works on 16th February, 1995.

ADDITIONAL WORK PROJECT II OF THE ALGECIRAS WADI RESERVOIR, MUNICIPALITY OF ALHAMA DE MURCIA (MURCIA) was technically and definitively passed by the Directorate General for Hydraulic Works on 26th December, 1995
 

The dam shoulder and reservoir seen from upstream
The dam shoulder and reservoir seen from upstream
 

The works began on 22nd June, 1991, and were completed on 1st December, 1995.

The Algeciras Wadi Reservoir is basically of composed of loose materials with a heterogeneous land cross-section: a loamy central part faced with polygenic conglomerates. There is an overfall spillway with two thresholds next to the right-hand abutment of the dam, with a stilling basin and scour outlet consisting of two conduits with a common outlet. These conduits are located in the base of the scour outlet gallery (previously the river diversion gallery).

 

The dam shoulder seen from downstream
The dam shoulder seen from downstream
 

The dam has a maximum height from its footings of 80.00 m, and 75.00 m from the river-bed.

The length of the dam crest from the spillway to the left abutment is 636 m, not counting the 70 m crest of the side dike which closes off the gully running into the reservoir on the right bank. The crest has a total width of 14 m.

Detail cross-section type of dam

Cross-section type of dam

 

 

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