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Flood System

The fortress Terezin greatly illustrates the extent to which water can be used for defense purposes. Besides the water flowing from the river Eger (Ohre), the present groundwater served as a significant barrier for the enemy trying to dig trenches or undermines. The original section of the river, so called Old Eger, was supposed to flood moats of the Small Fortress, while the newly constructed waterway, so called New Eger, was to flood the Main Fortress. For this purpose there is a sophisticated system of flooding and drainage facilities, through which either all moats and inundation basins, or just endangered sections could be flooded. The moats and inundation basins were flooded by canals with floodgates. The main water gates which regulated the level of water were built into the bridges over the New and Old Eger. Not far away upstream there are filling water gates through which water penetrated into the moats of the Small and Main Fortress. A sufficient momentum of the water in inundated moats was assured by a construction of the moat, whose bed gradually mildly descended from the filling flood gates towards the sluice gates. The sluice gates are located near the bridges over the New and Old Eger on the side of the downstream. The work on the inundation and drainage system was finished in the spring of 1790. The whole system was proved in June the same year and started its operation. A successful attack on the fortress would require to destroy mine charges (see stop No. 2) and preventing the flood mechanism to engage. This would mean destroying the bridges with floodgates over the New and Old Eger or diverting the water away from the fortress by constructing a new riverbed of Eger. Both possibilities were unlikely because the bridges were perfectly fortified and to divert the water away from the fortress would take 108 days if 11.000 men worked on it. French Vauban´s fortresses were the inspiration for the construction of Terezin fortress and also models of Mezier´s School of fortress engineering. The fortress Terezin, consisting of inner, central and outer defense zone including mine tunnels and inundation system, matched perfectly all known fortification elements of the end of the 18th century.

Řeka Ohře – vpustě

Zavodňovací kanál

Pohled na splavové mlýny r. 1933

GPS position

N 50° 30.500', E 14° 9.446'



Památky jinak, o.s.
Věra Gruntorádová