Holes in Cut & Fill Surface

[itsnathanblake]

Hi guys I've put together my cut and fill surface and for some reason holes have appeared in this surface showing an elevation close to -100m which is totally wrong. 

is there any reason why this might be happening or what needs to be done to get around this?

I looked in my main road and design surface drawing and there is nothing apparent that stick out to me.

[Neilw_05]

It's hard to say what is causing it. Typically it happens when several surfaces are pasted together and the seamlines don't merge properly. A quick way to fix the holes is to add a SHOW BOUNDARY to the surface. It will cause the triangles to form across the holes. You can create a single show boundary that encompasses all the holes, or even the entire surface.

[Neilw_05]

I think I may not have understood the issue. You are working with a Volume surface and those are not holes but spikes in the triangulation. That is an entirely different situation. I can't diagnose it without a file.