One of the objectives in Chapter 8 is to turn all valves that block the discharge of poisonous / spoiled water. On this page of our Darksiders Genesis guide you will learn what you need to do to drain the water.
The first valve is behind the poisonous waterfall.
The huge pipes behind it – they’ll help you find the valve faster.
The second valve is located near the top of the waterfall. To get to it, you need to jump in the place marked on the screenshot above.
A small stone shelf with the Stone of the Call is behind poisonous water pipes. Go there and jump down to move on. Take the glasses downstairs to move on to the next place.
You’ll probably see a window telling you your character is dead. Don’t worry, your character will be reborn on the other side of the location. There you can turn the third valve.
The fourth piece of the puzzle is behind the exploding wall. You need to break the wall to get to this valve. Place the bombs here and light them with a nearby fire.
After that, you just need to jump on the rock and turn the valve.