On 06/23/2016 07:06 PM, trader_4 wrote:

Not that I'm really thinking of redesigning our sprinkler system, but
out of curiosity I picked up RainBird's questionnaire/layout sheets to
send in for them to design an appropriate system, and one thing struck
me as very odd:

One is supposed to measure both the water pressure and the rate of water
flow from a spigot, e.g., time how long it takes to fill a 5-gallon
bucket. BUT is ours the only house where the existing sprinkler system
is fed from a 1-1/2-in PVC pipe run from immediately after the meter,
whereas the outside spigots are fed through 1/2-in. pipe beyond the
pressure regulator?

What useful information would the pressure and flow rate measured at one
of our spigots provide?

Must be one hell of a system to use 1 1/2 inch pipe. The incoming
supply for my house is only 1" poly. For residential sprinklers they
use 3/4" poly. Friend had a well put in for irrigation, 1" poly from
the pump to the tank.

The 1-1/2-in. pipe is just as far as the manifold -- 3/4" poly from the
various zone valves on.

Agree with your observation about the spigot rate not supplying the
right info. But it's all that people have that's easy and quick.
They probably assume it's coming from a 1/2" supply line and use it
as a minimum.