Does anyone here have any experience irrigating from a cistern set up? One of our property managers' wants to "go green" and is requesting a cistern to irrigate from. It's not a small system, 23 zones w/2" feed. Without auditing it, I'll estimate 40gpm, mostly rotor zones for turf. For a basic 20 minute cycle the demand will be 18,400 gallons. At 4x a week it will be 73,600 gallons. I have already learned that to meet the criteria set for Leeds certification an irrigation cistern cannot be supplemented with potable water, or you must show at least a 50% reduction in water usage. Even three 10,000 gal reservoirs won't be enough to handle two cycles! If it could be replenished quick enough, that just means we are already receiving sufficient rain totals, so I think it's improbable (if not impossible) to make sense in this case. I have heard of success on a smaller scale, homes that utilize the gray water along with rain, but I think these are only out west though. I have no experience with cisterns and don't want to try to invent the wheel, but I would think they are out there somewhere. I don't think the kind that you will see in Mexico will meet our codes.