Once you're regained control over your character, turn right and talk with the man taking care of an ostrich. The conversation will be joined by Ayawaska, a Jukolian shaman. The nefarious actions of Dr. Olga and her helper have polluted the water in the lake, which was a source of water for the tribe's ostriches. Kate decides to step in and solve the problem. Begin by making your way right. Go past a something similar to a flag pole and follow the path until you've reached the dam.
Click on the white dot in the upper part of the ladder and take a look at the pressure indicator located on the bank of the canal (marked with a red rectangle). Take a closer look at the mechanism to read the supplied walkthrough. The manual allows us to learn that the two waterways in the middle still supply the lake with fresh water, while the contaminated water enters the lake through the top and bottom waterways (all four sources are represented by four handles placed on the wall on the left). Leave the close-up.
Filter the polluted water
Now, climb onto the ladder and disable the top waterway by manipulating the top handle counter-clockwise (if you've haven't touched any of the handles yet, the bottom one is turned off by default). Your task is not over yet - open the lower middle waterway by turning the handle clockwise, while the handle of the upper middle one should be left out facing a 45 degree angle (i.e. half its course). A successful modification will result in a new achievement - No time to lose!).
Return to Jukolian grounds (turn right and proceed forward) and talk to Bouruth once again. Enter the tent and make your way left until you've reached a tunnel marked by a hanging antler - the tribe's shaman can be found inside. Speak to her and talk through all the subjects at hand, , after that you must leave her quarters.