Just a tip for ponding friends who, like me, are anticipating an iced over waterfall and pond - fill your pond! The ice will "consume" way more water than you think and you'll end up with an undefiled pond, a chugging pump, and the need to get a hose out in the freezing temps to add water to the pond. I always try to make sure that the pond is as full as possible before the worst of winter hits us!