The purpose was to decrease the floods which sometimes threaten to entirely submerge the city.
For the next sixty years an urgent question was the prevention of floods in the capital.
The greatest proportionate deficiency, however, is observable in the arenaceous region between the Danube and Theiss, where for the most part only periodical floods occur.
Among the worst floods were those of the years 1 774, 1 799, 1815, 1830, 1845, 1862, 1890 and 1909.
During floods they pour over their banks upon the surrounding valleys, by a thousand channels which interlace and establish communication between the main streams. After numerous bifurcations they find their way into the sea by three principal mouths.