Jerigen, I could be wrong but, I think, what raer is trying to do is use a common, cheap farming watering practice in Arizona, where you contact the Salt River Project (or other organization) to schedule when to receive the water, sent via canals. SRP (or whomever) is the owner of the water and this costs almost like pennies a year (maybe not literally). Older homes have access to this flood irrigation (usually, you do something like schedule things, open a sleuth gate and flood your yard). Mesa Community College does that in Mesa for their rose garden.
raer: please contact Steve Sheard at the Mesa Rose Society. He is a good Master Consulting Rosarian there and is familiar with the flood watering program at the Mesa college too:
[email protected] PS - I told Steve that you would be emailing him.