[Help/Bug?]Scaled maps+water=crash!

I made a simple map with a large crater in the center, then resized the map to 384x384x256 (x, y, z) and then added a water volume to it. When I tried to rebuild the geometry only it crashes, and gives me an assertation error. If I remove the water the map builds fine but the water is the purpose of the map.

Anyway since I know the editor gets finicky I was wonder if anyone else has successfully done it and how they did. Thanks.

Never mind I fixed it. For those that have this problem here is how.

You have to make sure the ripplescale (under surface ripples) matches subdivisionsize (under surface waves).