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  • History of hydrology alterations
    seen in a topographic map of 1949 When performing the first lake researches in 1904 Biržulis was mentioned as a lake that was shallow overgrowing with dense vegetation with extensive swampy areas and particularly abundant with fish otters and birds Very aggressive fishing was also mentioned In 1930 the water mill on the outlet Virvytė River 1 5 km from the lake was destroyed and river bed cleaned This slightly literature mentions 25 cm lowered the water level of Biržulis Lake The average water level prior to lowering could be between 151 05 and 151 5 m above sea level Second time the outlet was cleaned and widened to 6 m in 1934 This resulted in additional decrease of water level by 60 cm and openning of wide mudflats with deep layer of silt Varnelė River above Biržulis Lake was also straightened There were plans to drain Debesnos mire however the owner of the mill of Varniai demanded a compenstion therefore such plans were not realized After performing lake depth measurements during the winter of 1934 the maximum depth of the lake was 4 5 m and the average 1 24 m while the lake itself covered an area of 726 ha altitude 150 2 m above sea level In the history of Biržulis Lake the fifth decade of the last century is called The great mistake of Biržulis Then in order to adapt the area to agricultural needs there were plans to drain the lake completely In 1955 the land reclamation started by once again deepening the riverbed of Virvytė River In the northern part the area of the lake decreased to a few hectares while the total area of Biržulis became less than 100 ha The Science Academy and fishing businesses objected to such reorganization however only Stervas Lake was saved from being drained By contraries water level was fixed in this lake in 1986 by building a dike and a spillway A lake area of 135 ha was sustained with an altitude of 152 5 m There is no data on how much the average water level has been changed however it seems like it led to increase in the lowest water levels and decrease in fluctuations In 1960 68 when it became clear that it is too complicated to achieve the set goal to adapt the drained area of Biržulis Lake for agriculture the project task of complete drainage was changed A decision was made to drain only the northern part of the lake while leaving the southern part to nature ornithological reserve was established in 1970 It was decided to slightly raise the water level in the southern part of the lake with the help of a sluice regulator A water body of about 120 ha had formed where water level was maintained for several decades without clear regulation procedures During a period of 1974 1978 several spring and autumn floods ruined most of the cultural meadows that were sown at the peripfery of the

    Original URL path: http://birzulis.gpf.lt/en/hydrology-alterations (2016-05-01)
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  • Teritorija
    Stervas Debesnai and wetlands restoration planning and practical measures are financed by the European Economic Area Financial Mechanism and the Lithuanian budget The Project Manager Varnių regioninio parko direkcija Dumbrių str 3 Ožtakių k Varnių sen LT 88324 Telšių r

    Original URL path: http://birzulis.gpf.lt/en/territory/item/11-teritorija (2016-05-01)
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