I found these kind of cool as an idea, as they can be added rather easily to existing cities and provide some greenery without taking up space, while providing shade:
I found these kind of cool as an idea, as they can be added rather easily to existing cities and provide some greenery without taking up space, while providing shade:
It does have an irrigation system. You can see the pipe assembly on the left. It is that big white thing running through. That goes to a water tank, which collects the rainwater from the sails and then pumps it back up when needed.