Laduviken
| Laduviken | |
|---|---|
Laduviken
|
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| Location | Royal National City Park, Norra Djurgården |
| Coordinates | 59°21′38.37″N 18°4′35.9″E / 59.3606583°N 18.076639°ECoordinates: 59°21′38.37″N 18°4′35.9″E / 59.3606583°N 18.076639°E |
| Primary inflows | Local stormwater |
| Primary outflows | Husarviken, Lilla Värtan |
| Catchment area | 110 ha (270 acres) |
| Basin countries | Sweden |
| Surface area | 5.3 ha (13 acres) |
| Average depth | 2.2 m (7 ft 3 in) |
| Max. depth | 3.2 m (10 ft) |
| Water volume | 117,000 m3 (95 acre·ft) |
| Residence time | 3 months |
| Surface elevation | 0.5 m (1 ft 8 in) |
| Settlements | Norra Djurgården |
| References | |
Laduviken (Swedish: Barn Bay) is a lake in Norra Djurgården, a semi-rural area in north-eastern , Sweden, forming part of the Royal National City Park. It is one of six lakes in Djurgården, the others being: Lillsjön, Uggleviken, Isbladskärret, Lappkärret, and Spegeldammen.
Most of the catchment area is composed of open grassland with scattered oaks and other hardwood. West of the lake, the buildings of the take up some 20 per cent of the surface and a few roads, a traffic route, the suburban railway Roslagsbanan, and the subterranean metro passes through the area. East of the lake are some minor one-family houses and commercial buildings. The terrain north of the lake is flat while the southern shore is steep and, as the area west of the lake is drained by a ditch dug through a filled-up wetland, most of the catchment area is located there and most of the inflow comes from an ooze and oil separator treating water from human-made structures. A tiny river guides the outflow east to the bay Husarviken which is part of the strait Lilla Värtan. In the late 1970s, the lake was deepened by dredging to prevent it from becoming choked-up during the 21st century, and a system of canals was then created in the western end of the lake. As part of a national park, the lake is considered as of great recreational value.
Most of the phosphorus reaching the lake are most likely derived from the university, while nitrogen contribution is derived from surrounding landscape and equal shares of copper input stems from all surrounding areas and structures. Generally the lake is considered as in good health with low levels of most metals and organic compounds, even though presence of hydrogen sulphide has been recorded relatively frequently, levels of copper in top sediments did increase during the 1990s, and analysis's of subsoil water in 1997 showed signs of environmental contamination.
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Wikipedia