Recreational use of Pärnu river The catchment area of Pärnu river is 6920 km2 (For example Emajõe river drainage area is 9740 km2). The output is 70m3/s, mean altitude above the sea level - 50 m, maximum altitude - 78 m, mean flow 64,4 m3/s and precipitation 700 mm. Main problems are floods, agricultural pollution, pollution from the local communities, drainage system and flood plain grasslands. There is an excessive flooding in spring. The most known is the Soomaa swamplands flooding in april. It is called to be the fifth season. A lot of rich soil are situated near the pärnu river, for example some of the biggest
Kodused ülesanded: 1. Kui palju vett saab 70 m3 auru, mis on temperatuuril 180 o C ja rõhul 8,0 atm, kondenseerumisel? Lahendus: P = 8,0atm, T = (273+180) = 453K, V = 70m3 = 70000dm3. g 8 a tm * 7 0 0 0 0 d m 3 * 1 8 P *V *M m ol m (H 2 O ) = = = 271362g = 271 kg R *T 3 a tm * d m 0 ,0 8 2 *4 5 3 K
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