Dalešická Přehrada - Koněšínská Pláž

Czechia Lake 2 - Good

Dalešická přehrada - Koněšínská pláž is a bathing area located at a large water reservoir on the Jihlava river in the Vysočina region. The beach features a grassy area with a sandy-clay bottom and is 150 meters long. In 2014, water quality was classified at level 3, indicating mildly elevated probability of health problems during water recreation. The area is characterized by recurring intensive cyanobacterial blooms causing high chlorophyll-a values and reduced water transparency.

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Water

A large water reservoir (482 hectares) on the Jihlava river. The catchment area is 1,138.3 square kilometers. The beach has a grassy character with a sandy-clay bottom.

Location

The bathing beach is located at Koněšínská pláž near the village of Koněšín. Coordinates: 49°10'45.634"N 16°2'35.281"E. The reservoir has a surface area of 482 hectares at an elevation of 380.5 meters.

Facilities

Information center with buffet and toilets. A recreational boat landing stop is located nearby. A campsite is situated between the beach and the village of Koněšín.

Water Quality

In 2014, water quality was evaluated at level 3, indicating mildly elevated risk of health problems. After the remainder of the season, water was satisfactory. Microbial contamination classification was not performed due to insufficient monitoring years; the first season classification was acceptable. Cyanobacterial cells measured 0–21,400 cells/ml in 2014. Repeated exceedances of chlorophyll-a limits, elevated cyanobacterial cell counts, and reduced water transparency were recorded. The catchment contains multiple point sources of pollution including wastewater treatment plants and sewage outlets from small and medium municipalities. Diffuse pollution sources include untreated wastewater from villages and agricultural runoff. The reservoir suffers from recurring intensive cyanobacterial blooms.

Risks

Cyanobacterial blooms occur repeatedly, causing high chlorophyll-a concentrations and reduced water transparency. Risk of short-term pollution during flood conditions on inflows. Multiple monitoring points in the catchment show high phosphorus content, bacterial contamination, and excessive chlorophyll-a concentrations.