when i put mine in , i called the soil and water management people for some professional help.lol they told me the same thing 4" overflow pipe, must be an ohio thing. anyways i put in 8", 4 good, 8 better. pond is acre with about 6 or 7 acres feeding her.it has been the wettest summer in years here. the pond never lost but 2 or 3 " all summer. when i dug the test holes i hit layer of rock 6 ft. down in one spot and small rocky soil in other. said they would not advise putting pond in . that wasn't stopping my life time dream lol. excavated the site , put back about ft clay,packed with 20,000 lb back hoe.asked him how many pond he has over seen , he said about 125 or so. (lot of ponds) asked how many have you been back too , he said 3 or 4 . you would think that would be the best part. needless to say i was not impressed with the soil and water people at all.
