An issue with some non-rogue trail work.
So this area has been an issue for some time as there is some significant water coming through the area. That being said, while I applaud the effort you generally cannot fix erosion by filling in the hole alone, the water needs to be controlled/redirected to prevent the problem. Trying to pack millings in is just a waste of material/time.
The addition or at least keeping the small relief ditch to left right (when decending) is a great idea, but the ditch is way to small and at too much of an angle to relieve the volume of water creating the issue.
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Yup i does suck what is needed is at least 2 water shedding features at the top. One of the bigger issues is at the very top half the hill was removed this is allowing a lot more of the water that is rolling across to go straight down this trail instead of bing diverted initially. This and the fact we have been getting some bad downpours instead of any all day light rain is a contributing factor. Trust me we are very disappointed by this section not even sure if there is a good reroute line.
Simply put where is the water coming from? Where can you put it? How will the soil/area react to the changes?