Thanks smile
The water level control structure has been already built for the max. level (about 5m). It has been located in the deepest spot and the level right now there is ~3m or a bit less. So there's no problems with that (I'll try to re-post a pic later. seems like all links to the pictures on the 1st page are dead).
Right now the weakest part is the dam itself. One layer managed to slip away so it's a bit thinner than it should be(maybe it would be strong enough but nobody wants to take such risk).

Last edited by Grundulis; 10/15/14 01:07 PM.