Drainage Tunnel Under Česká Street

The sewage canal was buried two metres below the bottom of the medieval town ditch and its task was to carry waste water from the surrounding buildings and probably also from the town ditch.
  • 17th century

On the corner of Solniční and Opletalova streets, directly opposite the Slavie Hotel, a drainage and sewage canal was discovered at a depth of 6 m during a survey in 2006. It was attached to the inner side of the wall, which ran in that part as part of a baroque bastion system built in the 17th century.

The sewer, 1.7 metres high and 1 metre wide, was arched with bricks and plastered. The floor was also of brick. However, it was not possible to determine the length of the sewer as it was two-thirds filled with silt and earth. It was necessary to start clearing it out gradually. Gradually, new information and discoveries were made. Many of the various connections and branch galleries were mostly filled with dirt and waste. The construction of this technical building was done with great care and skill, but the long period of inactivity had left its mark on them as well. After it was cleaned, it was found that it continued to the east in a straight line under the buildings of the block of houses between Opletalova Street and Česká Street and led to Moravské náměstí.

According to its location and archival documents, the sewer was probably built in the second half of the 17th century in connection with the construction of the new fortification of the town. This has been confirmed by dendrochronological analysis of a sample of oak beams on which the brick floor of the sewer rested. The canal was buried two metres below the bottom of the medieval town moat and was intended to carry waste water from the surrounding buildings and probably also from the town moat. As it was also connected to the sewer leading from Špilberk, it also drew water from the surrounding slopes that once fed the town stream. Today the drainage adit is accessible only through a manhole cover and a shaft from the sidewalk in Česká Street.

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