Paranapanema River

The Paranapanema River (Portuguese, Rio Paranapanema[4]) is one of the most important rivers of the interior of the Brazilian state of São Paulo. The river forms most of the boundary between the states of São Paulo and Paraná.

Paranapanema River
Map of the La Plata Basin, showing the Paranapanema River joining the upper Paraná River.
Location
CountryBrazil
StateSão Paulo, Paraná
Physical characteristics
SourceSerra dos Agudos
 • coordinates24°51′S 48°10′W
 • elevation910 m (2,990 ft)
MouthParaná River
 • location
Brazil
 • coordinates
22°39′31″S 53°5′15″W[1]
 • elevation
233 m (764 ft)[2]
Length929 km (577 mi)[3]
Basin features
River systemParaná River
Tributaries 
 • leftApiai-Guaçu River, Taquari-Guaçu River, Itararé River, Das Cinzas River, Tibagi River, Pirapó River
 • rightItapetininga River, Pardo River

Course

From source to mouth the Paranapanema River has an elevation drop of 677 metres (2,221 ft). The river's length is about 929 kilometres (577 mi).[3] It flows generally west, reaching the Paraná River at an altitude of about 233 metres (764 ft).[2]

The sources of the river are protected by the 22,269 hectares (55,030 acres) Nascentes do Paranapanema State Park, created in 2012.[5] The sources are situated in the Serra Agudos Grandes, in south-central São Paulo, approximately 100 kilometres (62 mi) from the Atlantic coast.

From the sources to the mouth of the Itararé River, the Paranapaneba flows within the territory of São Paulo state. Below the Itararé the Paranapanema forms the border between the states of Paraná and São Paulo.

The river is associated with a date according to State Law 10.488/99 (Antônio Salim Curiati), sanctioned by Governor Mário Covas, designated as August 27.

The Paranapanema is the least polluted river of the state of São Paulo.[6]

Gradient

The average total gradient of the Paranapanema River, from its sources to its mouth in the Paraná river is 61 cm/km, not considering the first 100 km, where the river descends from the Serra of Paranapiacaba, at an average gradient of 43 cm/km, a value relatively low for a stream with a length of 929 km.

The Paranapanema river may be divided into three principal stretches:

Lower Paranapanema

From its mouth at the Paraná River, to the Grande Falls, a length of 421 km, the average gradient is 29 cm/km. There are widths of more than 200 m, deeper and shallower stretches, widths that reach nearly 800 m. The radii of curvature are in the order of 1.000 m. The course is more or less meandering presenting a complete horizontal equilibrium, with an excess, only of the stretch close to the junction with the Paraná river, where one may notice the existence of moving sand-banks and islands.

Middle Paranapanema

From the Grande Falls up to the confluence with the Apiaí-Guaçu River, with a length of 328 km, the river descends a total of 210 m. It is not possible to calculate an average gradient on this stretch, because due to the construction of various dams for the provisioning of hydroelectric power, the level will fall abruptly at those dams.

Upper Paranapanema
Basin of Paranapanema, Tiete, and Paraná

The Upper Paranapanema reaches from the confluence of the Apiaí-Guaçu River to the river's sources in the Serra de Agudos Grandes, with a length of 180 km. The average gradient is quite high, 150 cm/km. It drains a series of streams that descend from the Serra of Paranapiacaba, the Upper Paranapanema is gaining size and consolidates to receive the Itapetininga River and Apiaí-Guaçu river.

Navigation of the Paranapanema River is practical along the lower course up to the port of Euclides da Cunha, down the chute of the Coroa do Frade, with a length of about 70 km, counting from the mouth into the Paraná river. Navigation is fairly hazardous. Under normal conditions the minimum depth of this stretch may be estimated at about 1.5 metres (4.9 ft).

For the last 421 km downstream, the course between the mouth and the dam of Salto Grande, the average gradient is an about 29 cm/km.

The main natural obstacles that interrupt or make navigation dangerous are: a basalt bank, hidden rocks, reduced current velocity, too little depth, a straight canal in the middle of the river, an elevated current velocity, an undulating movement, a sinuous canal, sand banks, and stretches with high gradient.

The great reserves of water held in the Paranapanema's reservoirs have considerable influence on the regime of the river in its middle course. In the lower course the influence is reduced, with no effect on the natural conditions that completely impede navigation.

Dams and reservoirs

The Paranapanema River has in total eight dams and their respective reservoirs. The following table traces a list going in the direction of the Paraná River.

Dam Reservoir power generation [6] Área of the reservoir[7]
Hydroelectric Plant of Jurumirim Reservoir of Jurumirim 98 MW 449 km²
Hydroelectric Plant of Chavantes - 414 MW 400 km²
Hydroelectric Plant of Salto Grande - 74 MW 12 km²
Hydroelectric Plant of Canoas II - 72 MW 22.5 km²
Hydroelectric Plant of Canoas I - 81 MW 30.85 km²
Hydroelectric Plant of Capivara Reservoir of Capivara 619 MW 576 km²
Hydroelectric Plant of Taquaruçu - 526 MW 80.1 km²
Hydroelectric Plant of Rosana - 353 MW 220 km²
gollark: Just go to the list of lists of lists and descend recursively.
gollark: Yep!
gollark: ~~brainf\*\*\* with weird numbers~~
gollark: Stick it in the license.
gollark: ***evil***

See also
  • Tributaries of the Río de la Plata

References
  1. GNS coordinates adjusted using Google Maps and GeoLocator
  2. Calculated with GeoLocator
  3. Varis, Olli; Tortajada, Cecilia; Biswas, Asit K. (2008). Management of Transboundary Rivers and Lakes. Springer. p. 271. ISBN 978-3-540-74926-4.
  4. Rio Paranapanema at GEOnet Names Server
  5. Alckmin, Geraldo; Covas, Bruno (22 June 2012), "Decreto nº 58.148, de 21 de Junho de 2012", Diário Oficial (in Portuguese), Government of São Paulo, 122 (116), retrieved 2016-12-06
  6. State Discussion Fórum on the conditions of the Paranapanema River
  7. Duke Energy Brasil - Usinas hidrelétricas no rio Paranapanema Archived 2009-08-15 at the Wayback Machine
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