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2013-07-22
Various River Management Methods Have Been Tested in Rivers Sidrabe, Platone and Kauliņa.
 
Various approaches and techniques are used in the management of freshwaters. In addition, management methods vary for different types of lakes, ponds, rivers and old river basins. Currently several potentially effective freshwater management techniques (published in foreign research papers) have not been tested in Latvia. Therefore, within NAT-PROGRAMME Project several of these techniques will be tested for the 3260 habitat in a number of Natura 2000 territories in Latvia – Nature Park "Bauska", Nature Reserve "Ventas ieleja", and Nature Park "Salacas ieleja".
 
Also, in order to maximize the quality of the guidelines for management of freshwater habitats, active collaboration with other projects and initiatives is planned. Several river management activities involving experts and representatives from other projects have already taken place this year, providing the opportunity to test various methods of freshwater management.
 
River Sidrabe 11.07.2013.
Ponds in the former park of the Lielplatone Manor House during springtime floods connect with the Sidrabe river and get flooded. As the water level goes down they once again become separate habitats. Intake of nutrients and the lack of pond cleaning have resulted in a dense layer of lemnids (Lemna minor, Spirodela plyrrhiza). As a result, the sunlight can not get through the layer of lemnids and the accumulated organics do not decompose, resulting in an oxygen deficit. Within this activity the layer of lemnids was removed. Removing the layer of lemnids ensures that sunlight can enter the water and oxigenic environment can reestablish, improving biological diversity. The effectiveness of this activity will be monitored to evaluate the use of this method elsewhere.
 
River Platone. 27.06.2013.
The aim of this action was to improve the drainage of water at a section of the river that had previously been used as a swimming site. This part of the river is clogged and creates an alluvion overgrown with water plants in the middle of the river. The redirection of the stream causes erosion of the right river bank and a number of trees have fallen into the river. In this case, trees growing on the coast of the river are necessary, since they create a necessary shade as well as diversify the landscape. During this event various method for redirecting the stream and removing sediments were tested, including combining mowing waterplants with removing sediments and the trees that have fallen into the water.
 

 





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