2.5 feet of gravel from the top of the pvc to the surface ?Today we started the adventure of fixing the bog! Pulled some of the plants and started pumping out the water. Then the fun of removing the gravel. Bog is 10x3x2.5 deep. Decided to only check out broken pipe. Seems its not broken- clogged! I suspect the horsetail rush has something to do with it. Roots running all along the pipe. Going to attempt a partial fix- replace old pipe which turns out is 1 1/4" with 2". Have the new 2" manifold ready so going to try to leave the good pipe in place and replace everything else.
you had drilled holes correct ?
you think its the horse tail that's clogging the line there not a lot of horse tail in your photos