Overhead or underhand

I want to improve my garden.  I need to protect it from the brutal winds we

have here sometimes, and I would like to shade a ****tion of it.  I am
going 
to build a framework similar to those at plant nurseries.  I would also
like 
to make raised beds to make it easier to access everything.

I was wondering about the water system.  I would like to have some
sprayers 
from the ceiling, as I see this reduces temperatures, and soaks everything

as from a natural rain.  Is this a good idea?  Should I have the water 
coming in from the top, plus some coming in pipes in the ground?  My
garden 
is getting irrigated spotty right now because the pipes flow into
trenches, 
and then gravity takes it to the plants.  The plants at the top of the
ditch 
get more water, and if something interrupts the flow, the plants at the
end 
don't get hardly any water.  I want to make an even distribution system so

that they all get a proper amount of water.  I would like it all to come 
down from above so that when the water is shut off, it drains out, making
it 
less likely to freeze come cold weather.

Ideas and experiences appreciated.

Steve

-- 
"...the man who really counts in the world is the doer, not the mere 
critic-the man who actually does the work, even if roughly and
imperfectly, 
not the man who only talks or writes about how it ought to be done." 
Theodore Roosevelt 1891