Completed the terrain, but instead converted it so it could be used with the Fluidos plugin. To use a terrain with Fluidos, it must be an enclosed object, not just a single facing sheet. I used the zero edge filter with a setting of 80 to get the narrowest and steepest edges, converted to a vertex object, and then enclosed the bottom with the fill command. I then tessalated the bottom. Could just select the top and add thickness, but that increases poly count compared to selecting and filling the bottom.