Is cistern building a lost skill?
House-side rain barrels seem to be increasingly popular, but what ever happened to in-ground cisterns? I know when my Midwestern US city was young they were ubiquitous. They were brick and mortar lined. This was a brick and lime producing city, so those materials made sense, and they last "forever"
I wonder if dug cisterns might be a better choice than plastic rain barrels. My house has concrete surface all around, or else I'd certainly consider a cistern. I don't know if there is anything to consider beyond dig a hole, line it with brick, fit it with a heavy lid. Were there ever cistern specialists?