Regarding drainage.. I have a few sections of 8" pipe that I'll place through the levee just above ground level before filling.. The pond does not collect drainage, it's only source of water will be the well + direct rain. The problem I am more concerned with is keeping flood water out.. The elevation is very low, I am actually building my home up over 7 feet.. With a very heavy rain in the area there is often 12-18" of water standing on the ground in this area.. I'll need some sort of screen to prevent fish loss, I expect the drain pipe will likely let in more water over the course of its life than it releases..