Fence Project - Fencepost Setting

The image I used to model my setting plan.

After deciding the type of post, I had to decide how I wanted to set the posts in the ground. I had read online that the rule with fenceposts is that 1/3 of the post length should be underground. My posts were 7 feet long, so that meant about 2 1/3 feet would be underground. I had then found out that with wooden poles, there needs to be some gravel underneath to allow water to disperse and not pool in the wood, which would rot it faster. Websites had said about 6-8" was a sufficient amount of gravel. I went with this, but rounded it to 8" to make the total hole depth 3' flat. Once the gravel was in, we put the poles in, then while keeping them level, we added concrete and water, and mixed it around a little bit to make sure it was all mixed. The concrete was necessary in this case because of the vandalism in the area; I wanted to make sure that nobody could take out these posts. This whole process was way easier said than done, as digging a 3-foot hole is probably one of the hardest things I've ever had to do. I wouldn't have been able to do more than probably 3 holes without the help of my friends.