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L'Ufficio federale dell'ambiente ha pubblicato martedì la carta nazionale dei pericoli di ruscellamento superficiale, fenomeno che provoca fino alla metà dei danni causati dalle piene e che, in Svizzera, interessa i due terzi degli edifici. Disponibile anche su internet all'indirizzo www.map.geo.admin.ch, può essere usata da autorità, assicurazioni, costruttori e forze d'intervento.
Frutto della collaborazione tra settori pubblico e privato, è un importante strumento per la prevenzione delle inondazioni e un aiuto per adattarsi ai mutamenti climatici, che aumenta l'intensità e la frequenza delle precipitazioni.
Il canton Lucerna, che ha sperimentato il sistema per due anni, ha tratto un bilancio positivo: se la protezione viene considerata già nelle fasi di pianificazione e di progettazione, i costi aggiuntivi sono pochi o nulli.
ATS/dg
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