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I've got water runoff from the main road causing erosion on my access, and I need a way of intercepting it. I could dig in some sort of channel but tbh I would just see that clogging up. Easier, I think, to make a raised hump- essentially a speedbump- that diverts the water off the driveway surface. It would need to be about 5m long and laid on the existing tarmac bellmouth, just before the tar ends and the stone surface begins. I have asked a couple of contractors to do this, but getting fed up waiting- it's clearly such a small job that they aren't prioritising it. I could make a concrete hump, cheap and easy, but I don't think it's a good idea to lay concrete on top of tar. Probably fine until a bin lorry or sludge tanker goes over it. Obviously as this is at the start of the driveway, it's only ever going to be driven over at about 5mph, but my gut feeling is that concrete laid on tar will crack under a heavy load. So what about those tubs/bags of cold tar that are designed for pothole and driveway repair? Can they be used to build up a speedbump, or are they really only intended to fill holes?
