Birgi (fiume)

Birgi
StatoItalia (bandiera) Italia
RegioniSicilia (bandiera) Sicilia
Lunghezza43 km
Bacino idrografico336 km²
NasceFittasi, Chinisia
SfociaMar Tirreno
Modifica dati su Wikidata · Manuale

Il Birgi è un fiume della provincia di Trapani, che sfocia nel Canale di Sicilia tra Marsala e Trapani.

Percorso

Il fiume nasce nel territorio del comune di Buseto Palizzolo con il nome di fiume Fittasi, attraversando il territorio del comune di Trapani e in piccola parte quello di Paceco. Nel suo corso verso valle riceve il torrente della Cuddia come affluente di sinistra; su questo, che presenta il maggior apporto idrico su base annuale, è stato costruito uno sbarramento allo scopo di creare un lago artificiale a scopo di riserva idrica. L'invaso creato ha poi preso il nome di Lago Rubino. Il lago artificiale Rubino ha una capacità utile di 11,5 milioni di metri cubi di acqua e le dimensioni di 1,57 km quadrati.

Più avanti il fiume accoglie un altro affluente, il torrente Chitarra. Prosegue cambiando il nome in fiume della Mercanzotto, poi fiume Chinisia e infine fiume Birgi. Il Birgi si sviluppa per circa 40 km e ha un bacino idrografico complessivo di 330 km².

Nuovo alveo

La foce del corso naturale del fiume era nella frazione di Marausa[1]. Per la costruzione dell'aeroporto di Trapani-Birgi, nel 1961, si dovette spostare l'alveo del fiume due km più a sud, e fu costruito il canale artificiale in cui oggi scorre il tratto finale del fiume[2][3]. Il nuovo alveo finale del fiume Birgi con gli argini attuali fu costruito molto prima della costruzione dell'aeroporto di Birgi, lo stesso aeroporto è stato costruito alla fine degli anni 50 e gli argini forse prima del 1940. Il nuovo alveo di cemento si vede già nelle foto aeree militari del 1955[4].

Note

  1. ^ Mappa IGM con il corso naturale del fiume prima del canale Archiviato il 4 marzo 2016 in Internet Archive.
  2. ^ IGM con situazione odierna Archiviato il 16 novembre 2016 in Internet Archive.
  3. ^ Istituto per l'Ambiente Marino Costiero, Unità fisiografica-paesaggistica n. 1 “Stagnone”: Il nuovo estuario artificiale è stato realizzato, per motivi di pubblica utilità (realizzazione di strutture aeroportuali), 2 km più a sud Archiviato il 7 marzo 2016 in Internet Archive.
  4. ^ IGM Foto Aeree Archiviato il 21 novembre 2016 in Internet Archive.

Altri progetti

Collegamenti esterni

  • Osservatorio delle acque (PDF), su osservatorioacque.it. URL consultato il 4 settembre 2011 (archiviato dall'url originale il 19 novembre 2016).
  Portale Sicilia: accedi alle voci di Wikipedia che parlano della Sicilia

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