In short
A farm track potholes because water sits on it. Once a hole forms, its base and edges are compacted hard, so every shower pools in it and the traffic pumps the stone out again. Filling the hole with loose stone lasts a season. Rebuilding the surface with a camber, drainage to the side and a compacted base stops it coming back.
This is a job for our Traditional Stone Tracks service.
Why the same holes come back every winter
The Farmers Weekly guide to pothole-ridden tracks puts it plainly: the edges and base of a pothole are so compacted that water will always pool in it. Tyres then push the wet stone out and the hole grows. That is why tipping a bucket of stone in each spring fails by the following winter. You have refilled the hole but not changed the reason it fills with water.
On the estate and dairy tracks we work on around Petworth, Midhurst and Blandford Forum, the tracks that hold up have three things in common: a camber, somewhere for the water to go, and a base that was compacted in layers rather than tipped in one go.
The three faults we find most often
- No camber. A flat track holds water in the wheel ruts. Farmers Weekly recommends a 3 to 6 per cent camber so water runs off to the sides. On narrow tracks a single crossfall does the same job.
- No side drainage. Water that runs off the track needs a ditch, a grip or a French drain to take it away. Without one it soaks straight back under the edge and the track goes soft from the side.
- Stone laid on mud. Stone tipped onto soft ground sinks into it. Over a wet winter the mud comes up and the stone goes down. On clay or peat a geotextile membrane keeps the two apart.
How we rebuild a track that keeps failing
We rarely need to import all new material. Where a track already has years of stone in it, we scarify and regrade what is there, add stone only where the depth is short, and reshape it with a camber before compacting.
- Cut a camber or crossfall into the existing surface and open up or dig the side drains.
- Dig out the soft spots to firm ground and backfill with compacted stone in layers of about 150mm, which is the depth the government's RP4 hardcore track specification calls for.
- Lay a membrane on soft or peaty ground before the stone goes in.
- Finish with a finer stone to dust so the surface knits together and sheds water.
Traditional stone or planings
Both work if the shape and drainage are right. Crushed limestone or a local hoggin gives a track that rolls tight and can be regraded for years. Road planings bind in the sun and give a harder, smoother running surface for vehicles. We advise on the site, because gateways, dairy traffic and steep sections each favour a different finish.