I spent a while in Greenville (NH) today and heard what the residents of the downtown area are hearing for many hours every day. Over two years ago, a torrential rain caused the embankment below High Street to slough off into the dammed part of the Souhegan River, which gives Greenville its Swiss-village look. In order to repair the bank and make the street passable again, the town has spent years getting federal, state and local money together to do the repairs. Finally the construction crews started work this Fall, driving massive sheets of metal into the ground. The pounding is loud, and so are its echoes as they cascade off the rim of the bowl-shaped valley. Here is a little sample of the sound.