This shows a cutaway of a drainage system. It is in a book of Do It Yourself (DIY) that talks about how to install decks and patios.
The text described the hole, materials, and construction considerations. This cutaway illustration makes it easy for anyone to understand.
Making this as a 3d computer model is much cheaper than building actual products and cutting them open for a photo.

"All About Patios", Ortho® Books, ISBN: 0-89721-443-9