Petronio (torrente)

Petronio
Il torrente a Casarza Ligure
StatoItalia (bandiera) Italia
Regioni  Liguria
Lunghezza15,5 km[1]
Portata media1,244 m³/s[1]
Bacino idrografico61 km²[1]
Altitudine sorgente868 m s.l.m.
NasceMonte Groppi
Sfociamar Ligure
44°15′30.83″N 9°25′19.66″E
Mappa del fiume
Mappa del fiume
Modifica dati su Wikidata · Manuale

Il Petronio è un torrente che scorre nella città metropolitana di Genova.

Percorso

La foce nel Mar Ligure

Nasce dal monte Groppi[2], non lontano dal passo del Bracco e dal santuario di Velva. Attraversa Casarza Ligure e poi sfocia nel mar Ligure, nella baia di Riva Trigoso, posta fra Punta Manara e punta Baffe, in comune di Sestri Levante. La lunghezza totale del corso d'acqua è di circa 15 km.

La val Petronio è percorsa dalla strada Sestri Levante-Velva, che congiunge la costa con Varese Ligure e il parmense mediante la Strada statale 523 del Colle di Centocroci.

Idrologia

Nei periodi estivi, a causa della siccità, è quasi permanentemente in secca, ed è curioso notare che, nel tratto che attraversa Riva Trigoso, si riempie in verso contrario alla corrente durante le burrasche in mare con forza tale da rompere l'argine di sabbia (solitamente occluso).

Portate medie mensili

Il Petronio a Riva Trigoso
Portata media mensile (in l/s)
Stazione idrometrica: Riva Trigoso (periodo:1951–1954, 1964–1969 e 1971 (database di Hydro))
Fonte: AA.VV., Piano di bacino - Stralcio sul bilancio idrico - cartogis.provincia.genova.it (Provincia di Genova, consultato nell'ottobre 2015)

Note

  1. ^ a b c AA.VV., Il bacino del torrente Petronio (PDF), in Piano di bacino - Stralcio sul bilancio idrico[collegamento interrotto], Provincia di Genova. URL consultato il 15 ottobre 2015.
  2. ^ Renzo Pacini, La pesca, Sansoni, 1967, p. 372. URL consultato il 2 maggio 2020.

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