Poland doesn't have a lot of traditional style dams in those areas because much of the terrain is flat or low hills. Someone once said that it's not surprising that it got invaded all the time, it's so flat that cavalry can sweep through most places.
I cannot be arsed arguing the whole "How you play your game/canon vs non-canon/fiction vs reality" debate. Suffice to say I was presenting the information that I had found - the GM can decide whether to use that information or not and should not think that my presentation is a criticism of their plans
As for levee banks and so on, no there are none that I could find, it's literally a flooded river plain. If you have Google Earth you can access some photos people have taken around the lake
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