Arbogna Valley
The Arbogna Valley is a small valley formed by the stream of the same name and located on the Novara-Vespolate fluvial-glacial terrace.
The area is a popular birdwatching destination and is entirely within the Parco della Battaglia della Bicocca.
Geography
The valley begins near Piazza d'Armi, in the Bicocca district; from the Novara ring road, you can see the first hills sloping down towards the stream, which is still a small stream.A few kilometers south, precisely in the municipality of Garbagna Novarese, the valley begins to "dissolve", leaving only the aforementioned fluvial-glacial terrace.
File:Arbogna Valle.jpg|thumb|left|Arbogna stream at the beginning of its course
In addition to Arbogna, the valley is crossed by many small streams.
Origin
The valley was created by the erosive action of the Arbogna stream on the sediments of the Novara-Vespolate Terrace, which in turn dates back to the first glaciation.History and places of interest
In the Middle Ages, the valley was part of an area known as baraggia, a term that referred to the compact, clayey terrain that extended south of Novara's walls. Its northern section was bordered to the west by the village of San Gaudenzio, and to the east by the relief of San Nazzaro, continuing southward at least to Bicocca and the village of Olengo.Among the places of historical interest in the valley are the farmsteads, many of which date back to the 15th century, with the current structures dating from the 18th to the 20th century.
The Battle of Bicocca was fought in the valley in 1849.
Until the late 1970s, the main valley floor was a swamp of considerable size. Subsequent valley floor leveling and agricultural reclamation projects have transformed it into rice paddies, nestled within them, some uncultivable ponds.
Both in the marshes and in the rice fields, the phenomenon of funghìn could be observed: in shallow, clear water, when the surface water was absorbed by the ground and came into contact with the groundwater, the clay was diluted to the point of being neither liquid nor solid. The danger was mainly linked to working animals and heavy vehicles, which were difficult to extract from it.
''Parco della Battaglia''
At the initiative of local historian Angelo Luigi Stoppa, a committee was formed in 1989 to establish the Parco della Battaglia, to protect the area of the 1849 battle from a historical, landscape, architectural, and naturalistic perspective. The protection included the farmsteads at the center of the battle, the characteristic glacial clay hills and slopes of the Arbogna Valley, its flora and fauna, and all aspects of rural life at that time. The proposal was accepted by the Piedmont Region, which in 1992 placed a historical and landscape protection restriction on the area bounded by the Agogna river to the west, the Novara-Alessandria railway to the east, Piazza d'Armi to the north, and the municipal boundaries to the south.Crops
The crops grown in the valley are quite varied: rice in the valley floor, wheat, poplar groves and woods on the hills, together with corn, soybeans and barley.Fauna
Being a very diverse environment, the area hosts a wide variety of species.Among the birdlife, the grey heron, the little egret and the great white egret are present; in the summer, the black-crowned night heron and the squacco heron can also be observed. The mallard, the lapwing and the pheasant are common, while during migration, various species of waders are frequent, such as the sandpiper. In winter, the poplar groves host roosting pigeons and in the woods there are numerous species of passerines, including the blackcap, present all year round, and the robin, observable in autumn and winter. Among the birds of prey, the sparrowhawk and the buzzard are common, the marsh harrier is frequent, while in winter it is possible to observe the hen harrier.
The valley is also included in a repopulation and trapping zone extending over hectares between the municipalities of Novara, Garbagna Novarese, Nibbiola, and Granozzo con Monticello. As of 2011, the area was deemed suitable for breeding, primarily hares and pheasants.
The presence of foxes and wild boars is also known. The latter, in particular, are responsible for the damage caused to crops and the risks posed to the transit of vehicles.