World war II.
The first large repairs had to be done after the Second World War because the retreating German army destroyed all canal bridges, they sank boats and damaged weirs (the weir in Spytihněv was totally destroyed).
The war years seriously affected the waterway Otrokovice – Rohatec. The damage exceeded 10 million Czech crowns. The repairs started in 1946, and although the struggle was to manage everything by the summer, works on canal reconstruction still continued in 1947. The planned connection to Zlín again became a discussed topic; this connection was under consideration in the early 1930s whereby the canal was expected to be supplied by water from the planned dam in Slušovice.