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Dams & Hydropower


The project involves raising the height of the Santolea dam, a range of replacement and other works and the implementation of environmental impact and health and safety measures.

The work has consisted of the execution of a roller compacted concrete gravity dam with an irregular ground plan, a fixed lip spillway on the dam body and bottom outlet on the River Guadalope. It is located about 10 km from the town of Castellote – in the existing upstream end of the reservoir previously called Santolea – and will make it possible to maintain the reservoir at a constant level for environmental protection of the surrounding area and recreational use.

Most significant volumes:
146,472 m3 H-175 vibrated concrete
32,207 m3 H-175 compacted concrete
35,928 m3 H-250 structural concrete
813,905 kg Reinforcing steel
201.81 m3 Mass concrete foundation excavation
10,879 ml Passive anchorage 25 mm in diameter
26,223 m2 Formwork in dam body

Auscultation system: to control and measure the interstitial pressure in the core and foundations, total pressure on the body of the dam and displacement and deformation of the body and surface of the dam and its foundations.

Transfer and pump station

Pump station to collect the water from the Jiloca River in the winter months and carry it to the reservoir where it is stored for use in the summer. The pump station is located very close to the CN – 234, some 700 metres away from the intersection with the Lechago access road. The water collection and pumping assembly is designed for a nominal flow of 1.5 m3/s and an exceptional maximum flow of 2 m3/s. The principal elements of the station are the intake on the Jiloca River, conduction canal, suction well, impulsion pipes and discharge gallery.

The intake on the Jiloca River houses a small weir and mouth of the diversion channel to the pump station. The wire has a series of pipes (5 Ø300 mm pipes), to guarantee the passage of the flow from the Jiloca River. The intake grid and the sluicegates are located at the mouth.

The intake canal, which is 356 m long and designed for a maximum flow of 2.0 m3/s, consists of a first rectangular section measuring 2.0 x 1.2 m2 and 298 m long. The second section has a circular section of Ø 2.0 m and is 59 long, at the intersection under the CN-234. Este This second section drains into the suction well.

The pump station has a suction which is 15 m in diameter and 8 m high. Inside, there are four vertical, submergible centrifugal pumps with a capacity of 500 I/s equipped with 375 Kw engines and a manometric pump height of 50 m. Above the suction well there is a rectangular building whose interior dimensions are 12 x 5.50 m2 and 5 m high, which houses the Ø 900 mm general collector pipe and all of the valves and connections for the four Ø500 mm impulsion pipes of the respective pumps. There is also a 2,000 KVA transformer building which houses the transformer and the associated electrical panels.

The elevation pipe is composed of an impulsion pipe with an inside diameter of 900 mm and 360 m long and a gallery in cut-and-cover tunnel for crossing the dividing line with an inside section measuring 2.00x3.20 m2, inside of which there is a 1.20x1.00 m2 pipe. It is 105 m long.

Internal roads

Different internal roads were designed to run between the different elements of the project (body of the dam, administration building, drains, spillways and transfer pipes), all of which are connected to the relief road on the access road to Lechago.

The project includes a total of 1,020 m of internal roads.

Civil Engineering Projects
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