> Basically a 100' square catch basin on the roof of the building would provide all the water they need. Noise. Which raises the question: Why don't they just

> Basically a 100' square catch basin on the roof of the building would provide all the water they need. Noise. Which raises the question: Why don't they just do that? I'd imagine it would be less effort to process, and even though you do need to have a buffer against low rainfall periods, water is one of the easiest things to store.