Po (river)

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Po
Po river near Cremona.jpg
The Po near Cremona, Lombardy
Po bacino idrografico.png
Map of the Po River watershed
Location
Country Italy
Po Basin Italy, Switzerland, France
Cities Turin, Cremona, Piacenza, Ferrara
Physical characteristics
Source Monte Viso
  locationNear Crissolo, Piedmont, Italy
  coordinates 44°42′5″N7°5′35″E / 44.70139°N 7.09306°E / 44.70139; 7.09306
  elevation3,700 m (12,100 ft)
Mouth Adriatic Sea
  location
Near Adria, Veneto, Italy
  coordinates
44°57′9″N12°25′55″E / 44.95250°N 12.43194°E / 44.95250; 12.43194 Coordinates: 44°57′9″N12°25′55″E / 44.95250°N 12.43194°E / 44.95250; 12.43194
  elevation
0 m (0 ft)
Length652 km (405 mi)
Basin size74,000 km2 (29,000 sq mi)
Discharge 
  average1,540 m3/s (54,000 cu ft/s)
  maximum3,100 m3/s (110,000 cu ft/s)
[1] [2]

The Po ( /p/ POH, Italian:  [ˈpɔ] ; Latin : Padus or Ēridanus; Ancient Greek : Πάδος, romanized: Pádos, or Ἠριδανός, Ēridanós; Ancient Ligurian: Bodincus or Bodencus) is a river that flows eastward across northern Italy starting from the Cottian Alps. The Po flows either 652 km (405 mi) or 682 km (424 mi) – considering the length of the Maira, a right bank tributary. The headwaters of the Po are a spring seeping from a stony hillside at Pian del Re, a flat place at the head of the Val Po under the northwest face of Monviso. The Po then extends along the 45th parallel north before ending at a delta projecting into the Adriatic Sea near Venice. The slope of the valley decreases from 0.35% in the west to 0.14% in the east, a low gradient. Along its path lie 450 standing lakes. [2]

The Ligurian language was spoken in pre-Roman times and into the Roman era by an ancient people of north-western Italy and south-eastern France known as the Ligures.

Italy European country

Italy, officially the Italian Republic, is a European country consisting of a peninsula delimited by the Alps and surrounded by several islands. Italy is located in Southern Europe, and it is sometimes considered as part of Western Europe. The country covers a total area of 301,340 km2 (116,350 sq mi) and shares land borders with France, Switzerland, Austria, Slovenia, and the enclaved microstates of Vatican City and San Marino. Italy has a territorial exclave in Switzerland (Campione) and a maritime exclave in the Tunisian Sea (Lampedusa). With around 60 million inhabitants, Italy is the fourth-most populous member state of the European Union.

Contents

It has a drainage area of 74,000 km² in all, 70,000 in Italy, of which 41,000 is in montane environments and 29,000 on the plain. [2] The Po is the longest river in Italy; at its widest point its width is 503 m (1,650 ft). [1] It is characterized by its large discharge (several rivers over 1,000 km have a discharge inferior or equal to the Po). As a result of its characteristics, the river is subject to heavy flooding. Consequently, over half its length is controlled with argini, or dikes. [1]

The river flows through many important Italian cities, including Turin, Piacenza and Ferrara. It is connected to Milan through a net of channels called navigli , which Leonardo da Vinci helped design. Near the end of its course, it creates a wide delta (with hundreds of small channels and five main ones, called Po di Maestra, Po della Pila, Po delle Tolle, Po di Gnocca and Po di Goro) at the southern part of which is Comacchio, an area famous for eels. The Po valley was the territory of Roman Cisalpine Gaul, divided into Cispadane Gaul (south of the Po) and Transpadane Gaul (north of the Po).

Turin Comune in Piedmont, Italy

Turin is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is located mainly on the western bank of the Po River, in front of Susa Valley, and is surrounded by the western Alpine arch and Superga Hill. The population of the city proper is 875,698 while the population of the urban area is estimated by Eurostat to be 1.7 million inhabitants. The Turin metropolitan area is estimated by the OECD to have a population of 2.2 million.

Piacenza Comune in Emilia-Romagna, Italy

Piacenza is a city and comune in the Emilia-Romagna region of northern Italy, the capital of the eponymous province. The etymology is long-standing, tracing an origin from the Latin verb placēre, "to please." In French, and occasionally in English, it is called Plaisance. The name means a "pleasant abode", or as James Boswell reported some of the etymologists of his time to have translated it, "comely". This was a name "of good omen."

Ferrara Comune in Emilia-Romagna, Italy

Ferrara is a city and comune in Emilia-Romagna, northern Italy, capital of the Province of Ferrara. As of 2016 it had 132,009 inhabitants. It is situated 44 kilometres northeast of Bologna, on the Po di Volano, a branch channel of the main stream of the Po River, located 5 km north. The town has broad streets and numerous palaces dating from the Renaissance, when it hosted the court of the House of Este. For its beauty and cultural importance, it has been designated by UNESCO as a World Heritage Site.

Geography

Po Valley

The vast valley around the Po is called the Po Basin or Po Valley (Italian Pianura Padana or Val Padana); in time it became the main industrial area of the country. In 2002, more than 16 million people lived there, at the time nearly ⅓ of the population of Italy. [1]

Po Valley Plain in Lombardy, Italy

The Po Valley, Po Plain, Plain of the Po, or Padan Plain is a major geographical feature of Northern Italy. It extends approximately 650 km (400 mi) in an east-west direction, with an area of 46,000 square kilometres (18,000 sq mi) including its Venetic extension not actually related to the Po river basin; it runs from the Western Alps to the Adriatic Sea. The flatlands of Veneto and Friuli are often considered apart since they do not drain into the Po, but they effectively combine into an unbroken plain.

The two main economic uses of the valley are for industry and for agriculture, both major uses. The industrial centres, such as Turin and Milan, are located on higher terrain, away from the river. They rely for power on the numerous hydroelectric stations in or on the flanks of the Alps, and on the coal/oil power stations which use the water of the Po basin as coolant. Drainage from the north is mediated through several large, scenic lakes. The streams are now controlled by so many dams as to slow the river's sedimentation rate, causing geologic problems. The expansive, moist and fertile flood plain is reserved mainly for agriculture and is subject to flash floods, even though the overall quantity of water is lower than in the past and lower than demand. The main products of the farms around the river are cereals including – unusually for Europe – rice, which requires heavy irrigation. The latter method is the chief consumer of surface water, while industrial and human consumption use underground water.

Cereal Grass of which the fruits are used as grain, or said fruits

A cereal is any grass cultivated (grown) for the edible components of its grain, composed of the endosperm, germ, and bran. The term may also refer to the resulting grain itself. Cereal grain crops are grown in greater quantities and provide more food energy worldwide than any other type of crop and are therefore staple crops. Edible grains from other plant families, such as buckwheat (Polygonaceae), quinoa (Amaranthaceae) and chia (Lamiaceae), are referred to as pseudocereals.

Rice cereal grain and seed of different Oryza and Zizania species

Rice is the seed of the grass species Oryza sativa or Oryza glaberrima. As a cereal grain, it is the most widely consumed staple food for a large part of the world's human population, especially in Asia. It is the agricultural commodity with the third-highest worldwide production, after sugarcane and maize.

Irrigation artificial application of water to the land

Irrigation is the application of controlled amounts of water to plants at needed intervals. Irrigation helps to grow agricultural crops, maintain landscapes, and revegetate disturbed soils in dry areas and during periods of less than average rainfall. Irrigation also has other uses in crop production, including frost protection, suppressing weed growth in grain fields and preventing soil consolidation. In contrast, agriculture that relies only on direct rainfall is referred to as rain-fed or dry land farming.

Po Delta

Protected areas

The Po along the city of Turin. Torino - vista ponte Isabella - Castello del Valentino e Mole Antonelliana.jpg
The Po along the city of Turin.
Horse riding along the Po Delta. Ippovie Delta Po.JPG
Horse riding along the Po Delta.

The Po Delta wetlands have been protected by the institution of two regional parks in the regions in which it is situated: Veneto and Emilia-Romagna. The Po Delta Regional Park in Emilia-Romagna, the largest, consists of four parcels of land on the right bank of the Po and to the south. Created by law in 1988, it is managed by a consortium, the Consorzio per la gestione de Parco, to which Ferrara and Ravenna provinces belong as well as nine comuni: Comacchio, Argenta, Ostellato, Goro, Mesola, Codigoro, Ravenna, Alfonsine, and Cervia. Executive authority resides in an assembly of the presidents of the provinces, the mayors of the comuni and the board of directors. They employ a Technical-Scientific Committee and a Park Council to carry out directives. In 1999 the park was designated a World Heritage Site by UNESCO and was added to "Ferrara, City of the Renaissance, and its Po Delta." [3] The 53,653 ha (132,580 acres) of the park contain wetlands, forest, dunes and salt pans. It has a high biodiversity, with 1000–1100 plant species and 374 vertebrate species, of which 300 are birds. [4]

Regions of Italy First-level administrative divisions

The regions of Italy are the first-level constituent entities of the Italian Republic, constituting its second NUTS administrative level. There are 20 regions, of which five have a broader amount of autonomy than the other 15 regions. Under the Italian Constitution, each region is an autonomous entity with defined powers. With the exception of the Aosta Valley, each region is divided into a number of provinces.

Veneto Region of Italy

Veneto (, Italian: [ˈvɛːneto]; Venetian: Vèneto[ˈvɛneto] or Venetia is one of the 20 regions of Italy. Its population is about five million, ranking fifth in Italy. The region's capital is Venice.

Emilia-Romagna Region of Italy

Emilia-Romagna is an administrative region of Northeast Italy comprising the historical regions of Emilia and Romagna. Its capital is Bologna. It has an area of 22,446 km2 (8,666 sq mi), and about 4.4 million inhabitants.

The active delta

The most recent part of the delta, which projects into the Adriatic between Chioggia and Comacchio, contains channels that actually connect to the Adriatic and on that account is called the active delta by the park authorities, as opposed to the fossil delta, which contains channels that no longer connect the Po to the Adriatic (but once did). The active delta was created in 1604 when the city of Venice diverted the main stream, the Po grande or Po di Venezia, from its channel north of Porto Viro to the south of Porto Viro in a channel then called the Taglio di Porto Viro, "Porto Viro cut-off". Their intent was to stop the gradual migration of the Po toward the lagoon of Venice, which would have filled up with sediment had contact been made. The subsequent town of Taglio di Po grew around the diversionary works. The lock of Volta Grimana blocked the old channel, now the Po di Levante, which flows to the Adriatic through Porto Levante. [5]

Below Taglio di Po the Parco Regionale Veneto, one of the tracts under the authority of the Parco Delta del Po, contains the latest branches of the Po. The Po di Gnocca branches to the south followed by the Po di Maestra to the north at Porto Tolle. At Tolle downstream the Po di Venezia divides into the Po delle Tolle to the south and the Po della Pila to the north. The former exits at Bonelli. The latter divides again at Pila into the Busa di Tramontana to the north and the Busa di Scirocco to the south, while the mainstream, the Busa Dritta, enters Punta Maistra and exits finally past Pila lighthouse.

Despite the park administration's definition of the active delta as beginning at Porto Viro, there is another active channel upstream from it at Santa Maria in Punta, where the Fiume Po divides into the Po di Goro and the Po di Venezia.

The fossil delta

The fossil Po is the region of no longer active channels from the Po to the sea. It begins upstream from Ferrara. The Fiume Po currently flowing to the north of Ferrara is actually the result of a diversion at Ficarolo in 1152 made in the hope of relieving flooding in the vicinity of Ravenna. The diversion channel was at first called the Po di Ficarolo. The Fiume Po before then followed the Po di Volano, no longer connected to the Po, which ran to the south of Ferrara and exited near Volano. In Roman times it did not exit there but ran to the south as the Padus Vetus ("old Po") exiting near Comacchio, from which split the Po di Primaro exiting close to Ravenna. [6]

Before 1152 the seaward extension of today's delta, about 12 km (7.5 mi), did not exist. The entire region from Ravenna to Chioggia was dense swamps, explaining why the Via Aemilia was constructed between Rimini and Piacenza and did not begin further north.

Geologic history

The Mediterranean Basin is a depression in the Earth's crust caused by the African Plate slipping under the Eurasian Plate. Typically in geologic history the depression is filled with sea water under various geologic names such as Tethys Sea. In the last period of the Miocene Epoch, the Messinian (7–5 mya), the Messinian salinity crisis, a near drying of the Mediterranean, was caused by the sea level dropping below the sill at the Strait of Gibraltar and the equilibrium between evaporation and replenishment shifting in favor of evaporation. At that time the Po Valley and the Adriatic depression were a single canyon system thousands of feet deep. On the southwest the Apennine Mountains bordered a land mass termed Tyrrhenis geologically. Their orogeny was just being completed in the Miocene. On the north the Alpine Orogeny had already created the Alps.

At the end of the Messinian the ocean broke through the sill and the Mediterranean refilled. The Adriatic transgressed into all of northern Italy. In the subsequent Pliocene sedimentary outwash primarily from the Apennines filled the valley and the central Adriatic generally to a depth of 1,000 m (3,300 ft) to 2,000 m (6,600 ft) but from 2,000 m (6,600 ft) to 3,000 m (9,800 ft) off the current mouth of the Po, with pockets as deep as 6,000 m (20,000 ft). At the start of the Pleistocene the valley was full. Cycles of transgression and regression are detectable in the valley and the Adriatic as far as its centre and in the southern Adriatic.

From the Pleistocene alternation of maritime and alluvial sediments occur as far west as Piacenza. The exact sequences at various locations have been studied extensively. Apparently the sea advanced and receded over the valley in conformance to an equilibrium between sedimentation and glacial advance or recession at 100,000-year intervals and 100 m (330 ft) to 120 m (390 ft) fluctuation of sea level. An advance began after the Last Glacial Maximum around 20,000 years ago, which brought the Adriatic to a high point at about 5500 years ago. [7]

Since then the Po delta had been prograding. The rate of coastal zone progradation between 1000 BC and 1200 AD was 4 m/yr. [8] Human factors, however, brought about a change in the equilibrium in the mid-20th century with the result that the entire coastline of the northern Adriatic is now degrading. Venice, which was originally built on islands off the coast, is most at risk due to subsidence, but the effect is realized in the Po delta as well. The causes are first a decrease in the sedimentation rate due to the locking of sediment behind hydroelectric dams and the deliberate excavation of sand from rivers for industrial purposes. Second, agricultural use of the river is heavy; during peak consumption the flow in places nearly dries up, causing local contention. As a result of decreased flow salt water is intruding into the aquifers and coastal ground water. Eutrophication in standing waters and streams of low flow is on the increase. [9] The valley is subsiding due to the removal of ground water. [2]

Human aspects

Pollution

Always prone to fog, the valley is subject to heavy smog due to industrial atmospheric emissions, especially from Turin. [10]

In 2002, the city of Milan had no sewage treatment plant. The sewage went through channels directly into the Po, for which the European Environment Agency cited the city. [1] Since 2005, all sewage from Milan is treated in three different plants in Nosedo, San Rocco and Peschiera Borromeo. The three plants can collectively treat the sewage from over 2.5 million inhabitants equivalent. [11]

In 2005, water from the Po was found to contain "staggering" amounts of benzoylecgonine, which is excreted by cocaine users in urine. Based on these figures, cocaine consumption was estimated to be about 4 kg daily, or 27 doses per day per thousand young adults in areas that feed into the river—a number nearly three times higher than previous estimates. [12]

On February 24, 2010 the Po was contaminated by an oil spill coming from a refinery in Villasanta through the Lambro, the Agenzia Nazionale Stampa Associata news agency has estimated that the spill is in the neighborhood of 600,000 liters. [13] [14]

Water resource management

The Po in San Mauro Torinese in July 2012. SanMauroTse panorama.jpg
The Po in San Mauro Torinese in July 2012.

Until 1989 water resources were administered regionally or locally. The major authority on the lower Po was the Magistrato alle Acque di Venezia, first formed in the 16th-century Republic of Venice. It made all the decisions concerning the diversion of the lower river. Most part of the delta is still in Veneto.

In 1907 under the Kingdom of Italy the agency became the Magistrato alle Acque and took responsibility for all the water resources in northeastern Italy. Currently it is a decentralized institution of the Ministry of Public Works, headed by a chairman appointed by the Head of State and the Council of Ministers. Its headquarters are in Venice. Its domain is the management and protection of the water system in Veneto, Mantua, Trento, Bolzano and Friuli-Venezia Giulia.

In 1989 in response to the major geologic problems that were developing along the river Law no. 183/89 was passed authorizing The Po Basin Water Board (Autorità di bacino del fiume Po), which would direct operations concerning all the water resources in the Po basin (see under Po Valley). Its headquarters have been in Parma since its inception in 1990. It considers itself a synergy among all the institutions concerned with the preservation and development of the Po basin. It is administered by officials chosen from the administrations of the constituent regions and provinces. [15]

In the year 2009 the water board will initiate an Integrated River Basin Management Plan in compliance with the European Union (EU) Water Framework Directive, 2000/60/EC. [16] The plan includes many water management and flood risk plans already in place. Between 2009 and 2015 the Po Valley Project (the implementation of the plan) will carry out more than 60 measures to heighten and strengthen dikes, increase natural retention areas, recover sediment transport, recover hydromorphological characteristics, enlarge wetlands, afforest, renaturate, promote biodiversity and promote recreational use, among others. [17]

Dams

At the village of Isola Serafini in the comune of Monticelli d'Ongina, Piacenza Province, 40 km (25 mi) downstream from Piacenza, a 362 m (1,188 ft) long, 20 m (66 ft) high gate dam featuring eleven 30 m (98 ft) openings gated by vertical lift gates, crosses the Po. Nine gates are 6.5 m (21 ft) high and two are 8 m (26 ft) high for sediment-scouring purposes. A spillway to the right passes through a hydroelectric station of 4 generators of 76 MW each operated by a 3.5–11 m (11–36 ft) head of water. The spillway connects to a diversionary canal subtending a 12 km (7.5 mi) loop of the Po. A ship lock 85 m (279 ft) long and 12 m (39 ft) wide next to the station passes some traffic through the canal, but above the dam traffic is mainly barges. The average flow at the dam is 854 m³/s, with a 12,800 m³/s maximum. [18]

Tributaries

The Po has 141 tributaries. [1] They include (R on the right bank, L on the left, looking downstream):

The Reno (R) was a tributary of the Po until the middle of the eighteenth century when the course was diverted to lessen the risk of devastating floods.

Cultural history

The Po is first certainly identified in the Graeco-Roman historians and geographers of the late Roman Republic and the early Roman Empire, long after the valley had been occupied successively by prehistoric and historic peoples: Ligures, Etruscans, Celts, Veneti, Umbri, and Romans. At that late date the ancient authors were attempting to explain the provenance of the name. Perhaps the earliest of these, Polybius [19] (2nd century BC), uses Pados (in Greek) and says that it was to be identified with the Eridanos of the poets. Moreover, the country people call it Bodencus.

This implies that a "country" population either remained from prehistoric times or adopted the name in use by that substrate. The name has been segmented as Bod-encus or Bod-incus, the suffix being characteristic of the ancient Ligurian language of northern Italy, southern France, Corsica and elsewhere. [20]

Pliny the Elder has the most to say about the Padus of his times. Herodotus had expressed doubt concerning the existence of a river in Europe, Eridanos, which flowed into the northern sea, he said, from which amber came. [21] He believed it was a Greek name (there are other Eridanos rivers in Greece), "invented by some poet," but makes no conjectures as to where it might be. Pliny points out that in his own time the Eridanos had become wrongly identified with the Padus. He does not know when or how, but like Herodotus he blames the poets. [22] Amber is supposed to have come from there. Phaëthon, son of the sun, struck by lightning changed into poplars and exuded tears every year, which is the source of amber (a myth of Pausanias). Expressing surprise at the ignorance of the poets, Pliny says "There can be no doubt that amber is the product of the islands of the northern ocean (Baltic Sea)" and attributes its introduction into the Po valley to the Veneti, the last link in a trade route to the north through Pannonia and Germany.

Pliny (Hist. Nat., iii. 122) also gives the Ligurian name of the Po as Bodincus, which he translates as "bottomless". The root bod- has been generally analyzed as containing the PIE base *bhu(n)d(h)- seen in Sanskrit budhnah and Avestan buna- "bottom", Greek pythmen "foundation", Latin fundus "bottom", Old Irish bond "sole of the foot". The word Bodincus appears in the place name Bodincomagus, a Ligurian town on the right bank of the Po downstream from today's Turin. The Po, along with other rivers in northern Italy, was the scene of numerous military episodes throughout the Middle Ages and all the major cities and coastal lordships were equipped with real river fleets.

Mythology

The Po is often identified with the Eridanos or Eridanus river of Greek mythology. This mythical river is the namesake of the constellation Eridanus.

See also

Related Research Articles

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References

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