dunno much about them jen,

but the length of pipe i a run will affect volume of water as will too
many heads running at once try running 2 sprinklers reckon you will
see both drop fro how they run individually.

also you may need to know how much water your pipes are delivering
this may be needed so you can calculate the length of runs and size of
heads etc.,.

also a home with say 3/4" pipe connection to the mains and thoughout
the outside taps will deliver far more water than one with a 1/2 inch
system. lots of variables from the way i see it.



snipped
With peace and brightest of blessings,

len

--
"Be Content With What You Have And
May You Find Serenity and Tranquillity In
A World That You May Not Understand."

http://www.users.bigpond.com/gardenlen1