This is one of the smartest rain barrel contraptions I have seen, spotted at the Alex Wilson Community Garden here in Toronto. They don’t have access to a downspout but turned that around by setting up some kind of pipe system that funnels rainwater into this massive tub that also probably collect some amount of rain due to the large surface area. The multi-tiered system allows a great deal of water to be stored long-term.
Unfortunately, the following story about this particular rain barrel might turn some off the idea of contructing one in the first place. I think it just adds to the charming surprise of city gardening. Apparently when the system was first constructed, and before it had a protective mesh top, a friend of a friend arrived at his plot one day to find a nude man emersed in the “tub” taking a bath!