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 Introduction to Irrigation Design

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عدد الرسائل : 213
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الموقع : http://www.extratechnology.co.uk/
تاريخ التسجيل : 24/05/2008

مُساهمةموضوع: Introduction to Irrigation Design   الأحد يوليو 20, 2008 1:53 am

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Landscape Sprinkler Design Tutorial

Step #1


A quick primer on sprinklers.



Sprinklers
require two things to operate- water flow and water pressure. When a
sprinkler system design fails, it is almost always the result of a lack
of water pressure. This is important because, if you are like 99% of
the people using this tutorial, you are thinking solely in terms of
water flow. "How much water do I need (or have available) for my
sprinkler system?" That's an important question to ask, but it must go
hand in hand with its sister question, "How much pressure will I have at the sprinkler?"
The "at the sprinkler" part of that question is critical! Allow me to
demonstrate by means of a simple, if not somewhat stupid, demonstration.


Go
get a sprinkler, any sprinkler will do fine, even one you put on the
end of a hose. Now get a big bucket of water. 5 gallons is an ideal
size. Now place the sprinkler on the ground (somewhere outside is
strongly recommended) and pour the water into the sprinkler inlet. Did
the sprinkler operate correctly? Did it water a good size area? NO? Why
not? It had plenty of water! Ahh... no water pressure! The water you
poured into it didn't have any pressure to make the sprinkler operate.


Water pressure is the ENERGY
that makes the sprinkler do its thing. Water pressure is like the
gasoline for the car. Flow is like the distance the car travels. No
gas, no travel. No water pressure, no water flow. (Yes, Ms. Ph.D. in
hydraulics, that's a bad analogy- but it works for most people.)

Now
think of the inverse of the above example, because we're going to be
using it in our sprinkler design. We know that water requires pressure
to flow. It also stands to reason that just as the car uses up the gas
when it travels, the water also uses up the pressure as it flows! So
from the moment the water enters your yard, it is losing pressure. It
loses some pressure when it goes through a water meter. It loses some
more pressure as it moves through the pipes. Squeezing through the
backflow preventer and valves eats up more pressure. But here is the
key- after it gets to the sprinkler head there still must be enough
pressure left to make the sprinkler head work. If there isn't, it's
just like the sprinkler in the example above. All the water in the
world won't make it work without pressure! How much pressure is lost in
each of those items? It varies. You can control how much pressure is
lost, and that, my friends, is what sprinkler system design is all
about!

So here's sprinkler design in a nutshell:
Sprinkler design is simply manipulating out how much water pressure is
lost between the point the water enters your yard and the sprinkler
head. That's right, you are about to learn how to manipulate! (Come on,
you've always had a secret desire to be able to manipulate, right?)

At
the bottom of each page of the tutorials is a link called "glossary".
If you run into a term you don't know, click on glossary and look it
up. Warning: The glossary also has a lot of my bad puns and weird humor
in it.



Here's a brief overview of how we'll approach this:



Step #1:
You'll learn how to accurately measure your yard and then sketch out
the area to be irrigated. Next some information needs to be obtained.
Don't worry, I'll tell you how and where to get it. We'll also make an
"educated guess" at an Initial Flow Rate, which will serve as a
starting point for the flow and pressure manipulations mentioned
earlier.

Step #2: We'll take a look at those things
that will "eat up" your water pressure as the water moves to the
sprinklers. I'll show you how to find out how much pressure each one of
those items will use. While we're at it, you'll learn about sprinkler
heads, valves, backflow preventers and all the other equipment that
will go into your new sprinkler system. Then we will manipulate those
pressure losses and end up with the actual flow and pressure values you
will use for your sprinkler system. Don't panic, there's a lot of
information to cover, but I will lead you through it item by item. It
will be easy if you don't freak out on me!

Step #3:
Here's where we actually start drawing sprinklers. Finally! You will
learn a lot more about sprinklers in step #3. It's a long wait, but if
you had started drawing sprinklers back in step 1 or 2, like some
tutorials do, you'd be erasing them now!

Step #4:
Here's where you'll divide your sprinkler system up into zones and lay
out the piping routes. This is where we're going to make the right
decisions to create a sprinkler system that uses less water than most
and gives you healthier plants. Bad sprinkler design is a major cause
of turf disease.

Step #5: Finally, we will determine the size of each pipe and clean up a few small details.

Step #6: Wait a minute, there isn't a step 6. Congratulations, you're now a sprinkler system designer!

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عدد الرسائل : 213
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الموقع : http://www.extratechnology.co.uk/
تاريخ التسجيل : 24/05/2008

مُساهمةموضوع: رد: Introduction to Irrigation Design   الأحد يوليو 20, 2008 2:15 am

Measure Your Yard!






Gathering information is the first step for most projects and it is one of the most important steps when designing
both sprinkler and drip irrigation systems. A mistake at this point in the process will affect everything else,
so accuracy and care are important. Although the references here are to a residential yard, the principles apply
equally well to other areas. Here are a few tips for getting started.
















Now it's time to measure your water supply. Measure water? Sure! Water flow is measured in gallons per
minute (GPM) and water pressure is measured in pounds per square inch (PSI).. (Okay, in most of the world the standard
measurement is liters per second or cubic meters and pressure is in bars.) But hold on, don't go grab your bucket
yet! In most cases there's no need to get wet. We have better ways to get this information. The method depends
on where you get your water from.
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