The Migoelou Dam
DOI:
https://doi.org/10.3989/ic.1963.v16.i155.4637Abstract
This hydroelectric installation is on the higher section of the Gave d'Arrens, in the French Pyrenees. The dam has been constructed by the Electricité de France. The power station takes advantage of a hydraulic fall of 1840 ms, and its power is 124,000 kVA, with a yearly energy output of 400 million kWh. The main project is situated at a height of 2255 ms, so that it has been constructed during four successive summer periods. The height of the dam is 25 ms, and consists of a series of vaults. The volume of water it can hold is very considerable, being of the order of 17 x 106 m3. The foundations of the dam are granite, covered by a moraine of 20 ms maximum depth. The vaults of the dam, of 25 ms span, form two straight lines in planform, following the configuration of the ground. The thickness of these vaults is 2 m, and on the upstream side the slope is 0.6. The abutments have a constant thickness of 2 ms, and the one situated at the meeting point of the two straight sections has been designed to meet the most adverse possible situations. Statical calculations are based on the assumption of a temperature range between —15 and 35" C, and the thrust of ice formations has been disregarded. The project includes other smaller dams. Considerable work Was done in the initial stages in preparing access to the site, for which purpose it became necessary to install an aerial cable transport system.
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