I have learned from others here that rain is a great aerating event. Not until I saw an episode on time warp last night did I understand why...check this out...us water geeks may just get a kick out of this...found the episode on youtube...enjoy
http://www.youtube.com/watch?v=VoQ0DQpwwHU
http://www.youtube.com/watch?v=VoQ0DQpwwHU