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Each Vista Vue landowner is allocated 8.47
gallons per minute (gpm) per acre owned. Typical lots are 5.25 acres.
Thus your water allocation is:
5.25 ac x 8.47 gpm =
This is the maximum gallons per minute
that you can use at any given time. (For those of you who have
other sized lots, the math is the same: just take the number acres you
own times 8.47 gpm and that will give you your total gpm.)
know your total allowable gpm, you can calculate the number of
sprinklers that you are permitted to run simultaneously. Nearly all of
us run an impact sprinkler of some type. Common nozzle sizes run from
3/32" to 3/16". Each nozzle size puts out a specific number of gpm so
it is relatively easy to determine the number of nozzles that you can
run. For those of you who are using the plastic impact sprinkler that
can be obtained from Hamilton
Farm Equipment, there are 5 interchangeable nozzles. The most
common is the orange nozzle, followed by green, purple, blue and black.
The following chart lists the nozzle size and flow in gpm.
||1.6 gpm @40 psi|
||2.2 gpm @40
||2.9 gpm @40 psi|
||3.7 gpm @40 psi|
||4.4 gpm @40 psi
Using our above example of 5.25 acres and a total allowable
of 44.5 gpm, you can run 28 heads using purple nozzles (44.5/1.6); 20
heads using orange nozzles (44.5/2.2); 15 heads using green nozzles
(44.5/2.9); 12 heads using blue nozzles (44.5/3.7); and, you are
limited to 10 heads using black nozzles (44.5/4.4).
majority of metal impact sprinklers run 1/8" nozzles, although the
nozzle size can be changed to a smaller size allowing you to run more
heads. To determine your nozzle size you can use drill bits inserted in
the nozzle to determine the size. Note that over time and with the
abrasive nature of our water, the nozzle size will increase.
Those of you who are using double heads, i.e. two nozzles per
sprinkler head, are really limiting yourselves to a minimal number of
heads that you can run.
We are aware of several water users who
are using double heads with an orange and black nozzle. Total flow with
this configuration is 6.6 gpm. If you own 5.25 acres then you are
limited to running 7 heads. Using double heads provides you with no
advantage; you are limiting your flow and pressure, and the area that
you can irrigate while staying within your water allocation.
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further information contact: Stu Skidmore, President; Mike Stenberg, Vice President;
Gary Carlton, Secretary; or, Tracy Oestreich, Trustee;
We welcome your comments on the website.