As a rule, occurs on such of the mansions (especially the castles), where conditions do not allow digging wells. This is a sunk tank, which is well similar, but it is not so deep. Into this cistern was sváděná rain water from the roofs. The majority of the well nevtékala directly, but put a filter on through the backfill around the tank. Water is used as commercial and drinking. Eg. castles Owlery or Radyně should after two tanks. Around these tanks is kept as the strictest cleanliness.
Sources:
studies
own visit.
Sources:
studies
own visit.