It's an 80l trash can.
The inverted lid has small holes drilled in them and act as the rain collector.
Two more pairs of holes, at the edge of the lid and into the container, together with some string keep the lid from blowing away.
this post was submitted on 26 Jan 2025
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If you were lucky enough to get a very heavy rain say three inches you would have three inches of water in that can. For it to work enough to be practical you need a large surface area that diverts the rain water into the can. A roof with a downspout is a good example
You're spot on about surface area. A 1000 sq ft roof can collect about 600 gallons of water from just 1 inch of rain, compared to maybe 5-10 gallons from that trash can lid. I started with a similar setup and quckly realized I needed to connect to my gutters to make it worthwhile.