ice stupa

noun1

1. •
   A rough cone of ice created by spraying piped water into the air in freezing conditions, used to store water in a form that allows gradual release over an extended time.

   • Ice stupas were designed by Sonam Wangchuk in 2014, as scalable ice towers that can store fall and winter water, as ice, for use during the following spring and summer. — 2016