New ecological flow system at the Almendra Dam

Sistema de vertido de caudal ecológico en la presa de Almendra
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New ecological flow system at the Almendra Dam

Client:
Iberdrola Generación, S.A.
Location:
Salamanca
Period:
July 2015 - April 2016
Type of work:
Dams and irrigation networks
Budget:
520,000 € (VAT excluded)

The Almendra Dam is located in the Tormes River Basin, at the border between Salamanca, Zamora, and Portugal. This dam is the highest in Spain, with a maximum height of 202 m, while the Villarino Drops are some 410 m high (electricity generation). The current state of the dam requires installation of a new ecological flow line that ensures the supply of water to the Tormes River, maintaining the required environmental conditions.

The activities to be completed include:

- Demolition of the under-sluice tunnel and removal of the existing 1800 mm-diameter piping using a diamond circular saw and continuous sample extraction. The volume of demolished concrete exceeded 110 m³.
- Drilling of the face of the dam with a 600 mm diameter drill, using nearly tangential 300 mm-diameter and 7 m-long drills to pass through the piping for the new ecological flow line.
- Supply, prefabrication, and assembly of a new 1800 mm-diameter under-sluice section in carbon steel with branches of 900 mm for a future mini-plant and 500 mm for the ecological flow line.

- Building, testing, and assembly of the new 1800 mm-diameter circular Bureau gate in the under sluice.
- Supply, manufacture, and assembly of new ecological flow line in 500 mm-diameter stainless steel.
- Assembly of two 500 mm-diameter gate valve units, one motorized.
- Assembly of 350 mm-diameter hollow jet valve on the ecological flow line.
- Chamber concreting.
- Hydraulic connection of the new mechanical parts, as well as the electrical systems.

 
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