RDrancher
Veteran Member
One aspect I haven't seen mentioned yet is the importance of compaction, and maintaining it.
In general, the less material you loosen and move around, the better off you are. That is, add new material when repairing, rather than loosening already-compacted material.
This doesn't quite fit the OP's situation - he does need to knock down the whoop-de-doos first, but after that, he should avoid raking and scraping when he can.
For potholes, NEVER scrape up the hard surroundings; always add new fill.
This will also help with drainage, as was suggested above.
Maybe if you need more seat time! Exactly the opposite works best. Always loosen up the hardpack around potholes and then regrade and recompact the entire area. For a gravel drive or road full of potholes, ripping to a depth just below the potholes, regrading (which mixes the rock / fines back together) and then compacting the entire road works best. Just filling holes with gravel / rock is a bandaid fix at best, doesn't work and looks terrible. The reason that potholes happen in the first place is the soil underneath the gravel has sunk down, or the gravel / fines have separated (or both), leaving the fines in the hole with no gravel. Then they migrate out of the hole which leaves a pothole. Too much rock without a good road base will do the same thing. Ever seen asphalt or gravel laid over ungraded soil? Low areas always rear there ugly head in short time. How about a gravel truck spreading over an existing, potholed driveway? Looks great for awhile, then the potholes return in the same exact place. It's the same reason that soil is compacted in graded / even lifts and not just spread willy-nilly. Spreading soil or gravel / rock over holes or uneven ground results in uneven compaction and uneven material thickness which eventually leads to...you guessed it, potholes. Whoops happen because the fines have settled leaving rock on top. Rip, grade and compact, period.