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
What useful information would the pressure and flow rate measured at one
of our spigots provide?
Here, most homes feed their irrigation system off of the household water
supply -- a 3/4" line from the meter to the house then, typically, 1/2"
pipe feeding the hose bibbs on the periphery of the house.
We run the 3/4" copper water line through a stop, then the master valve and
antisiphone device into a PRV (*just* for the irrigation system -- the house
has a separate PRV and stop), through a fine mesh/high volume filter into a
1" PVC that feeds the 19 valves + PRV's for each of the 19 zones (4 of these
are actually valve-controlled hose bibbs).
[The PVC feeds the irrigation system in two directions (i.e., completely
encircles the house) so the "far loads" don't suffer from drops in the
~250 ft run]
N.B. Most homes, here, don't have big irrigation loads and rely on
*drip* irrigation -- much lower overall flow rates than "lawn sprinklers"
that throw lots of water into the air (40% of which evaporates).
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