The source sewer overflow rusty water can drain lake to reach the desirable level of the lake water. The top of the overflow drain is removed, leaving a 10 ideas from 36 feet "wide corrugated pipe that leads to a horizontal outlet pipe through the dam. Fill with concrete? please …

I would say the concrete (test is expensive additives water) and / or somehow put a bentonite clay plug Between 2 concrete plugs. Clay & Seal will perform a leak. On the side of the pipe is also suspect because it deteriorates the explosion in slow motion and creates empty spaces! A pinch of bentonite clay around the outside of the pipe is in order here too. The review of his case, is to dig, but be very expensive. Bentonite is a clay used for lubrication lead – very slippery when wet and Pentecost / Fine gray powder dry.