Rangersedge :

Have you calculated how much water you want to remove and appx. time to do so. We drop our 16 acre pond ( avg. depth 8-9 ft. max 20 ft. little shallow water) 3-4 ft. in a week with a 8 in. siphon. How big is the lake and avg. depth ? The water level can drop in a hurry at the end of the drawdown because the remaining water is in a smaller basin.