I wanted to share this problem and solution in case anyone out there is in the same boat. We have a 15 inch pipe that is 60 ft long underneath a driveway on our property. The fields behind us are tiled so this pipe mainly handles surface runoff and it is sufficiently sized for the area it services. We have rodent guards (looks like a pitch fork) on each end to prevent animals from nesting in the pipe. These guards were effective at keeping animals out, but would quickly clog with leaves and sticks and create a dam on the inlet side of the pipe. See attached image. These backups caused the water to reach depths of over 4ft. We decided to remove these guards but we wanted to ensure larger items didn't reach the pipe and cause even more headaches. We created debris catchers using some old stockade panel we had around the farm. This solution is highlighted in the below video and has worked really well thus far! Regardless of how your pipe is clogging, a solution like this may fix it! Tomato cages are a bonus on the house!