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Il Consorzio di Bonifica EST Ticino Villoresi, che regola la distribuzione dell'acqua per usi agricoli in Lombardia, ha tagliato drasticamente le portate d'acqua del Naviglio Grande e del Canale Villoresi, visto che - nonostante le recenti piogge - il Lago Maggiore continua ad essere troppo basso: è 37 centimetri sotto il valore normale.
Il Naviglio grande passerà da 18,5 a 13 metri cubi al secondo, mentre il Canale Villoresi scenderà da 42 ad appena 8 mc/s.
Anche cosi, però, la situazione del Verbano rimane deficitaria: venerdì pomeriggio il deflusso era di 64 mc/s, mentre in entrata non si arrivava ai 55 mc/s. Ogni secondo, in altre parole, escono nove metri cubi d'acqua in più di quelli che entrano.
Il problema è da imputare alla mancanza di neve in montagna: lo scorso inverno, molto mite, ne ha impedito l'accumulo. Sul tema si è pronunciata nei giorni scorsi anche Legambiente italiana, chiedendo un rilascio d'acqua dagli invasi idroelettrici in quota, che però servono alla generazione elettrica.
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