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Mandriole Valley

 


A bit of history

This low-lying area was reclaimed using a technique whereby sediment-rich waters are left to stagnate over the land to be reclaimed until they have shed enough silt to fill in the depression; the clean water is then drained away (bonifica per colmata naturale).  Upon completion of the reclamation project, the ensuing and definitive embankment of the Lamone River led to the physical separation of two freshwater valleys: Punte Alberete to the south and Mandriole Valley to the north.  Known locally as Valle della Canna or “Valley of the Rushes,” Mandriole Valley has lost its original morphology due to soil movement operations and to the maintenance of high water levels.  For many years, in fact, the basin served as a water reservoir for the Ravenna aqueduct, with waters coming from the Reno River.  The water level does however vary from one zone to another within the basin.  Its bottom is principally characterized by silt deposits.

 

Environment   

Mandriole Valley is a freshwater swamp: a vast expanse of reed beds, broken up by more-or-less open pools of water whose level is subject to seasonal variations.  In the deeper areas, we find water free of vegetation and thin strata of Nymphaea alba

Shallower waters are characterized by reed beds of mixed halophytes, Typha latifolia and Phragmites australis.  In the shallowest pools, which sometimes dry up, we find hygrophilous goat willow and riparian white willow woods.  The fauna of both Punte Alberete and Mandriole Valley is rich and varied, with numerous fish, amphibian, reptile and other species.  Marsh birds—Eurasian and Little Bitterns, Purple Herons, Grey Herons, Great Egrets—prefer settling in this area over the nearby flooded forest.  Among the anatids that nest in the wet zones are the Eurasian Teal, Garganey, Gadwall, Northern Shoveler, Common Pochard, Tufted Duck and Ferruginous Duck.  Some Western Marsh Harrier pairs nest here as well.   

 

To visit

One can reach the site from Strada Statale 309 Romea (9 km- RA/FE).  The “3A” trail of the Delta Park is accessible from the large parking area by crossing over the small bridge that spans Fossatone Canal.  The “1A” trail allows one to reach the Valle della Canna observation tower, which captures a 360-degree view of the swampy landscape.

 

Obligations

The site is included within the limiting boundaries of the Delta del Po Park as defined by L.R. 27/1988 and by the “San Vitale Pine Grove and Pialasse di Ravenna” Territorial Plan of 1991 (Zone B).  The area is subject to landscaping restrictions pursuant to L 1497/39 and to the regulations as defined by L. 431/1985; it is currently subject to the restrictions of D.L. 490/1999.  Both the wetlands areas are included in the Ramsar Zone known as “Punte Alberete and Mandriole Valley” (1480 ha), instituted by D.M. 09/05/1997, published in the G.U. n. 211 of 03/08/1977.  In addition, the complex is Site of Community Interest=Special Protection Zone (IT407001) known as “Punte Alberete, Mandriole Valley” (480 ha), instituted by DIR 92/43/EEC and by Dir. 79/409 EEC. 

 

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