Final deployment of the column.
All the ballast containers are full
and the ballast of the column keeps this latter vertical. The dimensions of the
column ballast depend on the force of expulsion developed by the auto-siphon.
Experimental models having determined this force, the ballast will be larger than
strictly necessary so as to avoid any pointless risk.
It was decided to
leave the column with a certain degree of free play by not making the ballast
containers rest on the lake bottom. In fact, although the column is ballasted
it can follow the movements of the barge caused, for example, by currents. This
degree of freedom seems to us to be indispensible given the fact that pressures
caused by wind and swell on the lake can be significant.