To run the boulder drop you have 2 options. The left and right line. the left line is in at lower water. as the water rises the left line opens up. it is less technical. the right line has a technical slotted entrance. after the entrance watch for a guard rock. you can go either side of the guard rock but it is very important not to get sucked into the sieve on the left. this can be achieved by boofing right. The left has an easier entrance you can boof on the left side of the sieve but watch for pin rocks at the bottom