The culprit had been identified: a giant ball of wet leaves and debris that had been blocking the pipe. Mike and John cheered in triumph as they disposed of the offending material and flushed the drain to test it.
If you own a pressure washer with a drain cleaning hose (jetting nozzle): how to unblock drains outside
Remove the drain cover (use a screwdriver or a drain key). Look into the chamber to assess the situation: The culprit had been identified: a giant ball
Miraculously, the water flowed freely once more, and the backyard was transformed from a swampy mess to a pristine outdoor space. John breathed a sigh of relief, grateful to Mike for his expertise and quick thinking. the water flowed freely once more