Osha
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Oscha Оша |
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| Data | ||
| Water code | RU : 14010100212115300006547 | |
| location | Omsk Oblast ( Russia ) | |
| River system | If | |
| Drain over | Irtysh → Ob → Arctic Ocean | |
| source | Lake Koshara 56 ° 2 ′ 54 " N , 72 ° 1 ′ 52" E |
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| Source height | 99 m | |
| muzzle | in the Irtysh coordinates: 57 ° 12 ′ 42 " N , 73 ° 40 ′ 13" E 57 ° 12 ′ 42 " N , 73 ° 40 ′ 13" E |
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| Mouth height | 51 m | |
| Height difference | 48 m | |
| Bottom slope | 0.09 ‰ | |
| length | 530 km | |
| Catchment area | 21,300 km² | |
| Discharge at the Shcherbakowo A Eo gauge : 15,000 km² Location: 43.4 km above the mouth |
MQ 1979/1999 Mq 1979/1999 |
4.95 m³ / s 0.3 l / (s km²) |
| Left tributaries | Ik , Bolshoi Ajov | |
| Flowing lakes | Tenissee , Achikul | |
| Communities | Kolossovka | |
 Course of the Oscha (Оша) in the catchment area of the Irtysh (yellow) |
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The Oscha ( Russian Оша ) is a 530 km long left tributary of the Irtysh in the West Siberian lowlands ( Russia ).
The Osha flows a good 20 km northwest of the city of Tjukalinsk from Lake Koshara , which in turn is fed by the 44 km long Tjukalka . It flows through after a few kilometers to 118 square kilometers of Tenissee which km² with neighboring west 146 large Saltaimsee is connected, and the small lake Atschikul (even this is sometimes given as the origin of Osha). From there, the Osha flows increasingly meandering for about a third of its length in mainly east, north-east and finally north-north-west direction through the southern part of the West Siberian lowlands. It finally flows into the Irtysh, 13 km northwest (downstream) of the village and district administrative center of Znamenskoye .
The catchment area of the river covers 21,300 km². The Osha has only a few tributaries. By far the most important are the Ik (length 48 km) and the Bolshoi Ajow ("Großer Ajow", 266 km), which flows into the lower reaches , both from the left.
The discharge at the village of Shcherbakovo, 43.4 km above the mouth and above the confluence of the equally abundant tributary Bolshoi Ajow, is 4.95 m³ / s on average, with a maximum monthly mean of 20.01 m³ / s in May and a minimum monthly mean of 0.87 m³ / s in March. The river usually freezes over from late October to the second half of April.
There are numerous smaller towns along the entire river. The most important is the Kolossowka Rajon Administrative Center . The regional road from Tjukalinsk to Tara follows the upper and middle reaches on the left bank ; the lower reaches are crossed by the regional road Tara - Tobolsk not far from the confluence .
Individual evidence
- ↑ a b Soviet General Staff Map 1: 200,000. Sheet O-43-XXI.
- ↑ Soviet General Staff Map 1: 200,000. Sheet O-43-XXVI
- ↑ a b c d Oscha in the State Water Register of the Russian Federation (Russian)
- ↑ a b c d e Article Oscha in the Great Soviet Encyclopedia (BSE) , 3rd edition 1969–1978 (Russian)
- ↑ a b Osha at the Shcherbakovo gauge - hydrographic data at R-ArcticNET