I am from TN and have started a new pond construction. It is a hollow which is spring fed. It will be 750 feet and average 120 feet wide. It starts at 16 feet deep and goes to 4 feet deep. We have it all cleared and top soil removed. We will be hauling red clay in to build dam. I want to stock blue gill and bass and possible trout. I have some of questions.

I have PVC pipe and valves for a spill way. Do I want a bottom draw of top draw?