Compensation for the loss of waterflow (due to energy harvesting) by streamlining the bottom and eventually the columns of the Oosterschelde storm surge barrier. Crazy enough this very simple solution has not been thought of before. The  los of water flow was the reason every official mentioned up till now as a reason not to place Energy turbines all over the barrier.  

Omroep Zeeland made a television report on this Tidal energy brake through, you can see it here

Read more about it here