"There are lots of things to think about...The success of the project will be in the planning" I agree!!!
site, depth, moving dirt i have thought through
what size pump will i need to keep ahead of the water filling up?, what if i cant keep ahead of the water...can i just dig it wet down to 15 feet?
what is the easiest way to dig this, start in the middle and spiral out to make a circle, or back and forth to make a rectangle...there is plenty of land, i can make it in any shape, what is the easiest?
from people who have done this before, what other items should I be looking at?
