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.
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,