Measure out your garden. Then note your measurements down on some grid paper - make 1m2 in your garden equal 1cm2 on your paper to keep things easy. Draw out the map, including any obstacles in your garden such as trees. You can now work out how many metres of polytube you're going to need for your irrigation system.
To work out how many and what type of sprinklers, pop ups or drippers, you'll need to measure the water pressure on your garden tap. To do this, measure the time in seconds it takes to fill up a 9L bucket at your tap on full pressure. Then using the size of the bucket, which in our case was 9L, divide it by the seconds it took to fill up, then multiply by 60. For example, if it took 20 seconds to fill up then 9 ÷ 20 x 60 will give you the number of your maximum flow rate per minute. This will help you choose what products you need to irrigate your garden.