Fingers crossed you have read the article that explains how pressure and flow effect the operation of a pop up and how pressure reduces as we use water.  If this is the case then read on if not then go back and read the first article.

We need to know how much water each pop up is using per hour and the amount of water pressure we have from our water source.  In the example below will assume we are fitting a pop up system to a small garden and we are going to run it from the mains water supply.  For large gardens we would probably use a tank and a pump.  This will be covered in a later article when we will explain to you how to decide what size tank you would need and the size of pump.  In the example below we will use a Hunter Pro Spray body combined with an Mp rotator nozzle as these are very cost effective, apply water very evenly and apply water slowly over a longer period of time making them ideal for low flow and low pressure applications which mains water supplies generally are.  On top of this the MP Rotator now accounts for about 85% of our pop up sales because of their leading spray pattern that applies water at 11mm per hour very evenly to the lawn .

Let us assume our water pressure is 4 bar and our flow from the tap is 1500 litres per hour.

lets now put this in to a simple graph

From the example above we can see that in order to maintain 2.5bar at the tap the maximum amount of water we can use per zone is about 550 litres per hour.  There are other pressure loses to consider however this goes beyond the scope of this article.  Please do take advantage of our free planning service if a more detailed plan is required.

Now we know what water we can use we can now see how much our MP Rotators are going to use per hour.  In this example we are going to assume we have a 10 metre by 8 metre lawn

We are using Mp 2000 nozzles set at 90 degrees in the four corners and in the middle we will use one MP1000 at 360 degrees.  From our mp rotator chart we can see that the mp 2000 rotator nozzles are using 74 litres per hour and our Mp1000 at 360 degrees is using 161 litres per hour.  This gives us a total of 457 litres per hour and if we pop this on to our chart we will see that our water pressure at the tap will be close to 3 bar.  From this we can assume depending on the pipe layout etc that we will probably be maintaining 2.5 bar at the MP Rotators spray head so it is well within the scope of pop up operation.  To view the mp rotator water usage guide please click here