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Bayco Reservoir

Background.

Overview:

Damages caused by torrential rains, historically occurring on the left margin of the Mundo river in urban and agricultural areas, have been considered as highly 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.

Thus, 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.

Dam crest
Dam crest.

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.

In May 1987, after the districts 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, especially in the Minateda rivebed.

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 undertake by the different coordinated agencies.

On July 18, 1989, the Technical Specifications for the technical assistance tender for drafting the Bayco riverbed dam project study in the municipality of Ontur (Albacete) were approved.

On September 13, 1989, the call for tender was issued, and the contract awarded to Proyecto y Control, S.A. (PYCSA).

The project of the dam in the Bayco watercourse was first drafted in April 1990, with Andrés Martínez Muñoz as Project Manager Engineer assigned to the Segura Hydrographic Confederation.

Mouth of the superface spillway
Mouth of the surface spillway.

Later on, in September 1990, a Report from the Dam Supervision Service was drafted, signed by Gaspar Zaragoza Gomis, presenting a series of recommendations to be taken into account during the execution of the works.

The Basic Project drafted was approved on April 11, 1991.

By means of the resolution dated April 26, 1991, the General Directorate of Hydraulic Works announced the call to tender for the works of Project 04/90, Bayco or Ortigosa riverbed dam; a tender admitting optional changes in order to improve flood control.

On July 30, 1992, the Directorate of Hydraulic Works decided to award the execution of works to Fomento de Obras y Construcciones S.A., known today as Fomento de Construcciones y Contratas S.A., with the Optional Solution Nº 2 developed in its Tender Project, giving a 2 month term from such date for the successful company to draft the final Construction Project.

Such directive was completed in September 1992, presenting the Bayco or Ortigosa Dam Construction Project (Albacete) for consideration with key 07.105.143/2112 and signed by road engineer Rafael López Manzano.

This Construction Project was approved on December 2, 1992, by resolution of the Directorate of Hydraulic Works with an execution term of 21 months.

On April 26, 1993, the subscription of Contract for the execution of the works was authorized.

The document verifying readiness for construction was signed on June 3rd, 1993, and on the June 4 of the same year the works began.

During the initial phase of the works, some new flood control studies were developed and, at the same time, more precise knowledge of the geo-morphology of the dam site collected, as well as the available materials for its construction.

Such knowledge led to amendment to the initial proposal, showing the need to re-design the dam and its attached hydraulic structures.

On June 2, 1994, the Works Manager Engineer asked for authorization to draft amendment Nº 1 of the 04/90 Bayco or Ortigosa dam project, in the municipality of Ontur and Fuente Álamo (Albacete).

On August 31, 1994, the General Directorate of Hydraulic Works, authorizes the drafting of Nº 1 amendment to the Construction Project of the Bayco or Ortigosa riverbed dam, in the municipality of Ontur and Fuente Álamo (Albacete).

The technical project was finally approved on July 25, 1995.

On June 22, 1995, the Segura Hydrographic Confederation requested authorization to draft the Project of Supplementary Works Nº 1 in connection with the Construction Project of the Dam of the Bayco or Ortigosa riverbeds. This request was grated on July 26, 1995. The drafting of such project was completed in September 1995, and it proposed that the supplementary works included should be developed urgently and that, according to their connection to the works in progress, they should be awarded to the same Contractor.

On August 11, 1995, the Technical Management requested authorization to draft the Modified Project Nº 2 in connection with the Bayco or Ortigosa Dam Construction Project, in the Municipalities of Ontur and Fuente Álamo (Albacete).

On October 16, 1995, the General Directorate of Hydraulic Works authorized the drafting of this project, whose technical approval occurred on October 8, 1996.

The works were completed on December 31, 1996, with a total liquidation budget of 2,239,524,721 pesetas (13,459,814.65 Euros).

The final admission of the works took place on December 30, 1997.

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