The summer after the pyramid fountain collpased, I cast this one. It was 6" deep overall with a 3" solid base, reinforced to prevent it from cracking.
Like its predecessor it also had an acrylic box inserted within it to contain the water, and a flexible rubber liner underneath that. The power cable for the pump simply stepped over the lip instead of being cast into the base. The lava rocks stayed too. The action of the pump created a 4" plume of water at the center that washed over the rocks covering the pump.
This fountain lasted two years before it cracked beyond repair.