Vn Čerťák

Czechia River 2 - Good

VN Čerťák is a popular bathing reservoir near Nový Jičín with relatively favorable swimming conditions. The water quality has been satisfactory over the past 10 years, with low levels of microbial pollution classified as good quality bathing water. The reservoir is also used extensively for sport fishing.

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Water

Reservoir with a surface area of 1.96 hectares at an elevation of 390 meters above sea level. The catchment area measures 1.69 km². The long-term average annual flow to the dam profile is 0.022 m³/s. The beach is sandy with a length of approximately 250 meters. The shore is predominantly grassy and the bottom is sandy-muddy.

Location

Located near the city of Nový Jičín in the Moravian-Silesian region. The bathing site is operated by the municipality of Nový Jičín, Masarykovo nám. 1/1, 741 01 Nový Jičín, telephone 556 768 222. The reservoir manager is Lesy ČR, s.p., Přemyslova 1106/19, 500 08 Hradec Králové.

Facilities

Seasonal refreshments and social facilities available at the local restaurant Čertův mlýn near the main beach. Volleyball and tetherball courts are available. No lifeguard or medical personnel present. Visitor numbers are tens of people per day.

Water Quality

Classified as good quality bathing water based on microbiological analysis results for intestinal enterococci and Escherichia coli from 2020–2022. Overall monitoring assessment indicates satisfactory condition. Total phosphorus concentrations historically exceeded limit values according to regulation 401/2015, but this parameter has not been monitored since 2012. Water transparency values typically oscillate around the bathing water limit value of 1 meter.

Risks

Increased cyanobacteria occurrence was recorded in 2003, 2007, 2008, 2009, and 2022, with water quality warnings temporarily issued by the health authority in 2022, though no bathing prohibition was imposed. Water transparency occasionally falls below acceptable levels during seasons with intensive phytoplankton development. A diffuse pollution source exists from the municipal root purification plant in Kojetín (part of Nový Jičín) with medium microbial and phosphorus loading risk. Increased water eutrophy may be expected due to sport fishing activities, particularly from common carp farming.