"Niewiadoma" retention reservoir

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Basic information

General contractor: Mostostal Warszawa S.A.
Location: Masovian Voivodeship, on the Cetynia River
area of the lagoon at NPP - 42.22 ha
damming level in NPP - 141.25 m above sea
level tank capacity at NPP - 1.14 million m³
the average depth of the reservoir - 2.7 m
maximum depth of the reservoir - 6.85 m
the length of the shoreline of the reservoir - 5.9 km

As part of the investment, a 500 m long front dam and a system of overflow and relief structures will be constructed, i.e.:

inlet with dimensions of 5.6 x 4.6 m
Wipro pipelines 2 x D_wew = 1000 mm, length 8.75 m
discharge tower with dimensions 10.5 x 11.0 x 9.1 m
adit with dimensions 36.3 x 5.5 x 3.0 m

The total length of the system of overflow and relief structures is 69.35 m, which is equal to the width of the base of the resulting front dam in its cross-section. Approximately 900 m³ of hydrotechnical concrete BH - 20, W-6, F-150 and over 32 tons of reinforcing steel B500SP certified with the EPSTAL quality mark in the form of bars with a diameter of 12 to 20 mm will be used to make the above-described devices.