If you are using miniscape / netafim sub-surface irrigation then you need to know the following:
a) The pipe (brown stuff) should be laid at correct spacing – for example some miniscape is rated at 30cm intervals and it needs to be laid accordingly.
b) It needs to run for around an hour to apply the correct amount of water.
c) The picture above is of the line flushing valve. When you turn the system on this will release water for around 30 seconds. It can look like your retic is ‘leaking’ but its not. Its normal.
d) You shouldn’t have more than an 8m run of brown pipe before it plugs back into the poly. You will lose too much pressure otherwise.
e) You should have a vacuum valve at the higest point of the system
f) You can also add filters to ensure the water is free from contaminants
A regular request is for us to create a system that does not have any water spraying onto the path/road etc.
This is pretty tricky in lawn areas but much easier in garden beds. In lawn areas the sprays span significant distances and while we do our best to avoid overspray it is important to have a little to allow for shifts in wind direction. Obviously its crazy to have water spraying directly on the road, but a little overspray is considered acceptable.
In garden beds it is easier to prevent this as miniscape and staked adjustable drippers allow for very specific watering. Miniscape is the subsoil drip system that is placed under mulch and releases water very slowly to the desired areas. If you aren’t a fan of miniscape (and many people aren’t) then you may prefer the staked adjustable drippers.
The drippers are attached to flexible 4ml tubing and plugged into the main 19ml poly line. In general you can have up to 70 drippers on one line and still be effective.
Personally I like drippers better than miniscape, as it is easier to see how they are working, but the cost is not significantly different if that is the main issue for you.
I’ve only done a couple of jobs in the new Yanchep estate of Jindowie, but what is most noticeable about this area is the very low water pressure.
I have no idea why the pressure is so poor, but I do know that at 15l/min you need to think carefully about how you go about things. Inevitably you will need to break your system into more stations and think about using drippers, miniscape and MP rotators rather than the stock standard pop-ups and microsprays.
If you are doing some DIY retic in Jindowie and wondering why your system is struggling then that could be the reason.
For help or advice with these issues call Andrew on 0400044236 or email firstname.lastname@example.org