Wisseler See Strandbad

Germany Lake 1 - Excellent

Wisseler See is an artificial bathing lake designated as a bathing water since 1976. The bathing area covers 100 metres of shoreline and is integrated into a larger lake exceeding 1 square kilometre. Water temperature ranges from 15.3°C to 24.6°C with an average of 19.4°C, and water transparency averages 2.6 metres. The lake has received an excellent quality rating for four consecutive years from 2015 to 2018.

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Water

Artificial excavation lake of 0.7 hectares with sandy and gravelly substrate. Mean depth is 10 metres and maximum depth is 21 metres. Water level fluctuates by 0.5 metres. Water exchange time exceeds 30 days. The water body is stratified and naturally eutrophic. Catchment area is very small at less than 10 square kilometres.

Location

Kalkar, North Rhine-Westphalia, Germany. The bathing facility (Strandbad) is located at Am Wisseler See 15, 47546 Kalkar. The lake is situated in lowland terrain at less than 200 metres elevation.

Water Quality

Water quality classification: Excellent for 2015, 2016, 2017, and 2018. No communal sewage treatment plants, industrial discharges, or household septic tank systems discharge into the catchment. No microbiological or chemical contamination in sediments has been detected. No cyanobacteria blooms have been observed in the last four years, with risk of future blooms assessed as low. Risk of macroalgae and phytoplankton mass development assessed as low.

Risks

Temporary risk of cercaria (duck itch causing bathing dermatitis) due to increased waterbird populations, particularly mallards, mute swans, and black-headed gulls that are fed by bathers. Waterbird counts have shown only individual birds, and the lake has no significance as a resting ground for migratory birds.