I'm not going to be able to advise much as I know diddly about pond construction, BUT pay full attention to the amount of watershed you have...160 acres is alot for a 5 acre pond. Or, at least, it is for around my neck of the woods.
My little 1/4 acre renovated pond has about 20+ acres of water shed and stays pretty muddy partly because of this. It will also fill in faster due to the extra soils washing in. The feeding ravine at my pond stays dry except for during rain events. Look into diverting some of that extra water to avoid the problems associated with too much watershed and consider createing some settling ponds above the main one. Your overflow/drain system will need to be bigger than the average 5 acre pond, much bigger.
Welcome to the forums!
Last edited by Quarter Acre; 05/06/20 01:15 PM.
