Kategooria hüdroloogia - 1 õppematerjal

Recreational use of Pärnu river (essee)

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 farmlands are situated in the Järva county. 83% of phosphorus and 79% of nitrogen originates from human activities of the total discharge of biogenes from Pärnu River basin. The soil does not bind a huge amount of the nutrients. 65 % of the treatment plants are over 15 years of age and most of them are programmed in...