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 a way, that when the water level exceeds some point, the sewage water will be sent directly to the outflow or in some cases to some biopools. There are a lot of straight drainage systems, ditches and dykes near the forests and farmlands which used to be excessively damp. This contributes a lot to the flooding in the spring, because the water will reach the main river in a very short time. The flood plain grasslands located along the riverbanks are the typical example of plant communities formed as a result of the joint influence of river floods and human activities. They used to maintain the grassland through hay-making but now the endorsements are
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