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Boquerón Reservoir

Background.

Damages caused by torrential rains, historically occurring on the left margin of the Mundo river in urban and agricultural areas, have been deemed catastrophic in many occasions, so it became necessary to urgently establish a defense and canalization plan to be implemented in the area subject to the study.

To that effect, the General Directorate of Hydraulic Works approved the public information file of the Segura Basin General Flood Defense Plan on November 12, 1986, within the Public Investment Program framework.

The anticipated actions of the General Defense Plan included, in particular, the Defense and canalization of the main affluents on the left margin of the Mundo river.

After the catastrophic damages caused by the flash floods of July and October 1986, the Official State Gazette published Royal Decree 4/1987 dated November 13, whose attachment nº 2 literally quotes the investment for the execution of the necessary works on the left margin of the Mundo river in Albacete, included in the Defense Program.

View of the side wall above the water from the left wall
View of the side wall above the water from the left wall.

In May 1987, after the municipalities affected by the floods held meetings with national, Autonomous Community of Castilla-La Mancha and Segura Hydrographic Confederation authorities, asking for a defense plan for the basin of the Mundo river; road engineer Andrés Martínez Muñoz drafted the Mundo river left margin flood study, describing the serious floods periodically occurring in the plains of the Mundo river and its affluents.

Likewise, during the drafting of this study, a meeting was held at the request of the Directors of Planning and Agricultural Policy of the Autonomous Community of Castilla-La Mancha with RENFE and experts working for the Segura Hydrographic Confederation, where they point out possible actions to be undertaken by the different coordinated agencies.

 

On December 12, 1989, drafting of the Boquerón basin dam project and the Mullidar-Boquerón inter-basin canal began, and the works completed in January 1991.

Mullidar-Boquerón transfer, final segment, near the entry to the Boquerón reservoir.
Mullidar-Boquerón transfer, final segment, near the entry to the Boquerón reservoir.

The project was approved by means of a Ministerial Ordinance on July 24, 1992. Subsequently, on October 28, 1992, the General Directorate of Hydraulic Works called the public tender to award the reference works.

On June 11, 1993, the General Directorate of Hydraulic Works chose Variant 10.8 Solution, among those presented by the temporary joint venture (U.T.E. in Spanish) of FERROVIAL, S.A. and OBRAS HIDRÁULICAS Y VIARIAS, S.A. The prescriptive Construction Project was drafted in July 1993.

On September 24, 1993, the Area of Dams issued a favorably report about the aforementioned project, with some recommendations to be taken into account during the construction phase.

Finally, on November 26, 1993, the works were finally awarded to the aforementioned U.T.E.

The readiness for construction document was subscribed on January 25, 1994, allowing the works to start the following day.

During the development of the works, according to the evolution of compacted concrete techniques and to the recommendations of the Area of Dams, the benefits of introducing certain changes which would affect the dam's compacted concrete, as well as shrinkage joints, spillway, and the bottom drain were noticed.

On November 10, 1994, the Works Manager engineer requested authorization for drafting Amendment 1 to the project.

On March 10, 1995, the General Directorate of the Hydraulic Works authorized the drafting of the Boquerón basin dam and the Mullidar-Boquerón inter-basin canal. This document included changes to the concrete of the dam body, to the spillway steps and to the overflow basin.

Supplementary project:

On March 27, 1996, the Segura Hydrographic Confederation requested authorization to draft the Supplementary Works Project number 1 of the Boquerón basin dam and the Mullidar-Boquerón inter-basin canal. The drafting of this project was authorized on July 18, 1996, and it included several works mainly affecting urbanization of the installations.

The works were completed at the end of 1997 at a cost of 3,531,437.773 pesetas (21,237,132 euros).

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