Freezing Waterfall in our Japanese Garden

Freezing Waterfall

We never know how late in winter the re-circulating water can flow in Clayton’s Japanese Garden. The first photo was from December 27; the one below from  December 29.  We haven’t had temperatures above freezing for five days.  The sun has been helpful, but with nights in the single digits, everything is freezing up.  Luckily the flow of water is keeping this waterfall open for the moment, providing a source of fresh water for drinking and bathing for the birds who feed nearby. The ice formations change from morning to evening as the water passes over or under existing ice, so we are able to enjoy seeing an ever shifting water/ice -scape.  Did Clayton know when he designed and then set the rocks for the waterfall that it could continue to provide such interest in the middle of the winter?