Ken S, I use the ramp to collect any water that drips off the left-hand side, and since, as you say, the diamond wheel is non-absorbent, I run it with a minimum of water. I'm not losing any water when the machine is just running, it's definitely water that drips onto the casting, on the right-hand side, that is running down the side and not being collected in the water trough. It's a design flaw. The top of the casting has a bevelled edge, to direct drips back in the direction of the water trough, but there's no overhanging drip edge, so water runs straight down the side of the casting and bypasses the trough.