Interpretation 2: well for collecting and then pumping water out, using a sump pump.

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Note added at 22 mins (2019-01-28 15:02:07 GMT)
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Agregat do przepompowywania ścieków, hermetyczny, do
zabudowy w budynku, wg parametrów na rys. WK-07, i
studnia w posadzce podziemia
http://www.bip.czerwionka-leszczyny.pl/download/18241.pdf
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Studnia w posadzce z włazem ażurowym i pompą zatapialną - wymiary 35x35x50 cm głębokości kpl. 7,00. 71. KNNR 4 1411/4. B-15.00.00
https://bip.malopolska.pl/e,pobierz,get.html?id=1375622

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sump well/pit

If you have a sump pump set into the concrete floor of your basement, should it be covered or sealed up to block out radon gas?

https://www.thisoldhouse.com/sites/default/files/styles/bann...
https://www.thisoldhouse.com/ideas/sump-pump-cover

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Note added at 33 mins (2019-01-28 15:13:10 GMT)
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Houses in which the the floor (usually the basement floor) is below the ground water level need to collect and pump the water out lest it flood the basement and/or put pressure on the walls. Such houses are equipped with sump wells/pits with submersible sump pumps to pump the water up and out of the house. There may be other situations in which a sump pit may be necessary for collecting liquids.

prop

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Note added at 87 dni (2019-04-26 11:52:40 GMT)
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http://www.lorijnenloos.nl/gifas/documentation/Floor pits.pd...