On Mon, 8 Aug 2005 04:53:34 -0700, "G Burton"
wrote:

The wind made a difference, and it appears that you were absolutely
right. In 12 min of sprinkling, I collected .132" at the bad spot and .305"
in the good spot.

Several of the bad spots are about 3 ft from a 12 ft spray nozzle, which
makes me suspect overspraying. I just measured my pressure, and got 62 psi
upstream of the solenoids

I set the pressure high because I have 16
sprinklers each in 2 of my sections.

Increasing pressure does NOT solve inadequate flow! Please review the
chat from RB and calculate flow demand.
http://rainbird.com/landscape/produc...hart_12MPR.htm
you've created a misting system!!!

At 30PSI if all were half sprays you'd have a 20GPM demand. I'm
approximating and not taking into account friction loss etc.

It would be very difficult to add more
sections.

Not to bad, what you need to add is another valve.....


Have you confirmed head to head coverage?
There are heads within 11-12' of the head with the dry spot....sorry
to repeat, but it's another one of the MOST likely problems with
installation! (I have seen both flow and distribution uniformity
problems)

I am using the better Rainbird sprinklers -- not the Home Depot version.
What would be the best approach?

Congratulations, most don't realize that HD sells crap!!!

a. Reduce the pressure? If so, what to?

Optimum charted pressure is 30PSI
http://rainbird.com/landscape/produc...hart_12MPR.htm
1899 series heads are capable of 70PSI but are foggers at that
pressure even with adequate flow!

b. Change the sprinkler nozzles? If so, what to?

Here our calciferous high dissolved solids level in city water DOES
distort spry nozzles after a few years.
c. Something else.
Acts of creation are ordinarily reserved for gods and poets. To plant a pine, one need only own a shovel.
-- Aldo Leopold