Tomnahurich hill feat the Jacobite Queen

Tomnahurich hill is a mainly Victorian graveyard. The vessel in front of it is a cruise boat on the Caledonian Canal and Loch Ness. On the back of yesterday's pictures I've been researching the area around the river where Hydro Ness lies. Why is there a huge weir? Why are there concrete structures and canalisation on the opposite bank? Mr Google has refused to tell me. Industrial achaeology is not well recorded.