In coldest regions, shutting down a waterfall for winter makes sense for several reasons. You save on energy costs, extend the life of equipment and also avoid having ice dams form. A running waterfall in winter cools pond water quickly and to a greater depth, potentially lowering water temperature to a point that’s unhealthy for fish. In place of a waterfall, add an aeration system to the pond for winter to add air to the water.
A small pond is tucked in a corner adjacent to a flagstone patio with an arbor providing shade when it's hot outside. Landscaping is designed for little pockets of seasonal color to move the eye throughout the space. Arkansas fieldstone is used to raise the pond side 18 inches to allow the homeowner a place to sit and watch the koi.