Well, I spent too much time on these forms. There is so much I didn't know and so much time and money I could have saved myself if I did know, but that's life for ya! In the desert, the ground is so hard, that concrete can be poured right into the trench, as long as the trench is the right size and below ground. But I didn't know, so I put forms in all the trenches. You can see the black plumbing pipes sticking up, also. Before the foundation is poured, the ground (rough-in) plumbing has to be laid beneath the foundation, inspected and approved.