There is more to erosion than just water, and water wants to seek its own level.
Wind would be constantly chipping away at such a berm, and that wind would be carrying a very effective abrasive.
On top of that, wind would also be washing the water against the berm, further eroding it.
I'm not sure what the structure of the existing dikes are, but they are pretty substantial, and built on a more solid substrate than what is closer to where we race.
I suspect building such a berm would require a bit more work than what somebody could do with just a grader.
And if we were to go in and start modifying the landscape to suit our needs, it could then be argued that we're as unconcerned about the natural surroundings as the potash producer.
Additionally, the BLM can't officially "confirm" salt loss right now. The studies that would need to take place in order to change the landscape that significantly would take years, there is a fair likelihood that the best conclusion would be inconclusive, and then there's the cost of actually doing the work.
Not ruling out the idea - if the dikes could be built in such a way that they preserved a safer, longer race venue, I'd be all for it. I'm just questioning the simplicity of the solution, and wondering about the process that would need to go into place in order to make it a possibility.