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.
Catch and save water from household chores to use in the garden. Keep empty 5-gallon buckets on hand to hold the catch from a dehumidifier. Use plastic milk jugs to save cold water that typically runs down the drain while you wait for hot.
Arrange plantings in zones based on water use. Group thirsty plants together, including things like bedding plants and lawn. Keep lower water use plants like shrubs and drought tolerant perennials in a separate area. Install an irrigation system controller that supports zone watering to enjoy state-of-the-art water savings.