This is a natural process generated when wind blows in a constant direction and piles water up on a downwind shore. When the wind drops, the water is released and flows back to the opposite shore. For example, when a seiche moves towards the western shore of Lake Michigan or Green Bay, it acts as a dam, slowing the discharge of rivers and creeks into the lake or even forcing water to reverse course and move upstream (adopted from Manitowoc report, 1998). Seiches can be especially dramatic in funnel-shaped bays where great volumes of water are pushed into increasingly smaller areas. This phenomenon is particularly important at sites such as Green Bay, Chequamegon Bay, and in the estuaries associated with the St. Louis and Mink rivers.