pressureless irrigation

On the pressureless irrigation issue.

Could you create more pressure? If a storage tank is raised, you create more
pressure. I'm thinking of the many water tanks I've seen that are raised on
towers, and the tanks on top of buildings in New York.

It's common to raise the storage tank to create pressure.

I regularly use dripperlines made by Netafim.

http://www.netafim-usa-landscape.com/Landscape/products_dripperline.php

Take a look at the information on this website - it's fairly clear.

The emitters are factory located inside the tubing. You can buy the tubing
with the emitters placed 12" on center or 18" or 24" or more. The 12"
placing is common here in gardens. I lay the dripperline on the ground and
cover it with mulch. On a slope, I would lay the tubing on the contours much
as Sean describes. You would need to use the tubing with
pressure-compensating emitters - these will work on slopes.

I now design all my projects using dripperlines in trees, groundcover and
shrubbery and sprinklers (gear-driven rotary) in turf (if turf is
unavoidable). This method is used all over here in California. I've done
work for one construction company that builds projects all over the western
u.s. They use the dripperlines on all their projects. What I like about the
dripperlines is their simplicity. There is no small spaghetti tubing  to be
kicked aside and clogged. No emitters to punch into tubing. You need to use
a flushing valve (described on the web site) and a air intake valve (also on
website) these flush debris out of the tube, and add air to avoid a vacuum
situation where debris is sucked into the emitters. It's very reliable.

I hope this is helpful.

Steve French

Steve French Landscape Årchitect
Sebastopol, California
707.829.1200
fax: 707.829.3967
www.stevefrenchla.com
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