Ok so my dad has had his pond for almost 10 years now and it was dug out at 18 feet. Well my cousin brought his depth finder and said he finder reads at 13 feet. Do you guys think it’s time to dig the silt out of the pond? And if it is what is the best way to do it? Drain the pond or could you do it without draining the pond? Also the pond is about 2.5 surface acres of water.