water problem

if you stand in the corner of the highlighted brushes (image 1), the top part would be cut off with no textures. there are no leaks or errors, so i don't think providing the compile log would be useful. turning water into func_detail doesn't help, it makes the water invisible. what do i do...

Just started mapping today and I wanted to create a simple KOTH map. I have a canal running through the center of the map, everything appears normal in hammer but when I launch the map in tf2 the water doesn't appear correctly and instead looks like I do not have a sky box. If my description...