Nádrže

Reservoirs of Slovakia in 3D

Waters with a bottom model: 475
Maximum depth: 70m
Largest area: 3,351ha
Total volume: 1,907million m³

Reservoirs in brief

The portal has a 3D bottom model for 475 still waters, 212 of them reservoirs. VN Orava has the largest area (3,351 ha). The deepest is VN Nosice (70 m). You can switch the model between reservoirs; for each you can lower the water level and look at the bottom, the original river channels and the rocks beneath.

3D model of the bottom: VN Orava

Rotate, zoom, lower the water level and see the original river channels under the waterMaximum depth27 mArea3 351 ha

Reservoir bed

Literature data

Loading the 3D model of the bed…

Maximum depth27 mfrom volume and area

Average depth11 m

Water volume355.7million m³

Water surface area33.5km²

Water level at full level601.5m a.s.l.

Dominant bedMud and organic sediments58 % of the bed area

How the model was made

Water outlineOpenStreetMap, extended along the elevation model to the area at the maximum water level from the literature. The water surface ends at the outline. Where the terrain behind it is lower than the water level (the plain behind a dam), the model adds the dam body, which the coarse terrain grid does not capture.
Surrounding terrainDigital relief model DMR 5.0 (airborne laser scanning, GKÚ). The slope of the banks above the water sets the slope below it.
DepthsThe maximum depth and volume come from published data; the model calculated the shape of the bed (valley profile from the dam, bank slope, volume).
Bed and bedrockGeological map of Slovakia 1 : 50,000 (ŠGÚDŠ); bed type by zones of erosion, transport and deposition of sediments.
Water colourSentinel-2 satellite: turbidity and chlorophyll from the latest image.

Model reliability

Literature
Fishing regulations
Estimate

The maximum depth or volume comes from published data.

Cross-section of the reservoir

Height is measured from the full level. The thicknesses of the bedrock layers are illustrative; the map shows the surface only.

Hypsographic curve

How the area and volume of water change as the level drops.

Bed and bedrock

Bed by zones of erosion and sediment deposition, bedrock from the geological map.

The maximum depth and volume of the reservoir come from published data. The shape of the bed between the outline and the deepest point is a model: the original channel of the tributary is only an estimate along the lowest line of the bed, and it contains no pits or flooded objects.

The maximum depth from the fishing regulations of the district does not match the size and shape of the reservoir, so it was not used.
The bank slope from the surrounding terrain is much gentler than the known maximum depth would suggest (the bed below the water is steeper than the bank above it).
The water level was lowered at the time of the airborne scan and exposed the reservoir bed; in this zone the depth is measured.

Sources

Knowledge & Management of Aquatic Ecosystems (2016), kmae160036, Table 1 (Slovak reservoirs: water level, area and volume at maximum level)
Hollister, J., Milstead, W. B. (2011): Using GIS to estimate lake volume from limited data. Lake and Reservoir Management 26(3)
Håkanson, L. (1981): A Manual of Lake Morphometry. Springer (wave base, zones of erosion, transport and accumulation)
Surrounding terrain: DMR 5.0, GKÚ Bratislava, CC BY 4.0
Water outline: © OpenStreetMap contributors (ODbL)
Geology: © ŠGÚDŠ, geological map of Slovakia 1 : 50,000

Reliability A: pre-flooding map or a published figure.

Open the fishing district VN Orava

The largest and deepest reservoirs

Rankings by volume, area and depth. Click a name to switch the model.

Largest water volume

1.VN Orava356 mil. m³
2.VN Liptovská Mara334 mil. m³
3.VN Zemplínska Šírava316 mil. m³
4.VN Domaša174 mil. m³
5.VN Nosice112 mil. m³
6.Dunaj č. 3 – zdrž VD (Hrušov – Čunovo)89,7 mil. m³
7.VN Starina55,6 mil. m³
8.VN Ružín48,0 mil. m³

Largest surface area

1.VN Orava3 351 ha
2.VN Zemplínska Šírava3 265 ha
3.Dunaj č. 3 – zdrž VD (Hrušov – Čunovo)2 681 ha
4.VN Liptovská Mara2 063 ha
5.VN Domaša1 432 ha
6.VN Nosice490 ha
7.VN Ružín360 ha
8.VN Sĺňava345 ha

Deepest reservoirs

The area comes from the water outline. The volume and depth rankings include only reservoirs where these are known from a pre-flooding map, the literature or the district rules; estimates from the shape of the water are left out.

All reservoirs with a bottom model

From the largest by volume. Each with its area, maximum depth and volume.Reservoirs212

Gravel pits, lakes and ponds with a bottom model

Other still waters whose bottom we can show in 3DWaters263

The 60 largest of 263 are shown. You will find the bottom model of the others on their fishing district page.

How the bottom model is made and how far to trust it

Three reliability levels and the sources the model is built from

No public bottom surveys exist for most Slovak reservoirs. We therefore build the model from several sources and say for each reservoir how far it can be trusted.

Spoľahlivosť A. The bottom is the original terrain from topographic maps made before flooding, or the maximum depth and volume are known from the literature.
Spoľahlivosť B. The maximum depth comes from the fishing district rules; the bottom shape is computed.
Spoľahlivosť C. Depths are an estimate from the slope of the banks and the shape of the water body.

The surrounding terrain comes from airborne laser scanning (DMR 5.0); the Sentinel-2 satellite tracks the colour of the surface and the extent of the water.

Vodné nádrže Slovenska