Tux, 1 or 2 boards will be taken out at a time to allow a slow release of water to not overflow things downstream. They crawl down into the dam and pull out a few boards, then probaly due the same the following day or two. At this pace should atleast take them over a month to drain it. I guess I'm going to have to find a new lake to do the majority of my ice fishing at this yr. The crappie are biting good though so get up there if you can and target brush