Jack,
That is interesting - you have more variables to deal with than I do, since I'm on a set pressure and unlimited (except for pipe size) flow. I think coordinating a storage tank, pump, and compressor to supply water would be an interesting challenge - but one I'm happy to do without.
With your 400' foot trellis it must nice to have TOO much water for a change - probably not something anyone in Texas has had a problem with recently.
Steve