Every time it rains a lot, we end up with this pond in our backyard. My yard sits in between my neighbors' from both sides in elevation, so there has always been a stream flowing through my yard during heavy rains. But lately the water has been collecting at the fence. My neighbor recently might have raised his side by adding sand and rocks which might be the reason for this. What can I do? I have bamboo in the back of my yard so digging anything there would be a pain, but I am open to any suggestions. TIA!