I have heard people storing rainwater in different ways to use for agriculture and for other non-drinking purposes and it's a very good way to save money and the environment
Some people always feel rain water is not useful but in some places, it's a major break from having to buy water. If you are in those kind of places, even if it's raining at night,just try and put your containers to save cost of buying water.
I wish if people can be more smarter and can use rain water to water plants and for other cleaning purposes and just they need to store rain water properly
Farmers in my country are building these kind if irrigation systems. And I I heard that the water collected can water a hectare of farm everyday for 3 months. You can imagine how much is saved on generating water for that three months.
Rain water harvesting would reduce the demand pressure on municipal water supply and also help conserve water resources. It saves water costs because it can be used to wash clothes and cars at home.