Most unusual frost/freeze predicted tomorrow. We're looking at winds 18
gusting to 25 with freezing conditions. The strawberries are in bloom.

Standard protocol for still condition frost in strawberry is one sprinkler
every 60 feet by 60 feet with a 9/64 nozzle. At 70 psi you get about .1 inch
per hour and protection down to 27 or 28. This don't get it for wind, you
need a lot more water. There's a convective cooling effect. I need to be in
the .3 inch per hour range.

I can double flow by protecting 1/2 the area and running a sprinkler every
30' by 60' spacing. Not quite there. My particular pump will run 40 9/64th
sprinklers at 70 psi. I don't know flow rate but its around 125 gallon per
minute.

Now for my question, I'm going to run 25 sprinklers on this pump and I need
to bore the ID out to match the pumps flow and get 70 psi. What diameter
should I try? I can't go smaller once bored, but I have time for two
trials. I'm guessing three hours work to remove 25 sprinkler nozzles, bore,
replace, and then test pressure.

Karl