Translate the following English sentence to French:
"One of the most significant transfers - the Tajo-Segura transfer - which has been in use for many years, almost 30 years, has an allowance of 658 hm3 per year."
Un des plus importants transferts - le transfert Tage-Segura - fonctionne depuis de nombreuses années, presque 30 ans, et a une concession de 658 hm3/an.