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Generate shadows without trees: vegetable awnings, a new way to generate shadows in the city.
(www.singulargreen.com)
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.
I see, thanks. You probably mean on the right? It is also explained in the article you linked.