Go Back  DoItYourself.com Community Forums > Garden and Outdoor Center > Lawns, Landscaping and Outdoor Decor
Reload this Page >

Four zone sprinkler system - very low water pressure.

Four zone sprinkler system - very low water pressure.


Old 08-04-14, 02:55 PM
Thread Starter
Join Date: Jul 2007
Location: Mexico
Posts: 314
Four zone sprinkler system - very low water pressure.

We have a four zone toro sprinkler system. It is rainy season for the last month or so and I haven't needed to run the sprinklers. Yesterday I ran the system to make sure there were no missing heads etc and there was very low water pressure - in all four zones. I had noticed in the past that there are several heads which seem to always leak water. I've purchased but not yet swapped out the 254-06-04 valves. I know in the last house sometimes a slug would get in the valve and that would affect water pressure - but that valve was a totally different setup. With the current system each valve is standalone.

Oh - the sprinkler system is fed from our cistern - which has been draining even with the sprinkler system off. There are only about 10 feet between the cistern and the valves and there are no apparent leaks.

Any ideas appreciated.
Sponsored Links
Old 08-04-14, 10:36 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 47,567
You didn't mention what the cistern is made of so it could possibly be cracked and leaking itself.
You also didn't mention the pump that is driving the sprinklers and what pressure it's operating at.
Old 08-05-14, 09:26 AM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 18,561
First, determine if you have a supply problem (pump, piping, intake screen...) or irrigation system problem. Post back once we know what part of your system to focus on.
Old 08-09-14, 11:32 AM
Thread Starter
Join Date: Jul 2007
Location: Mexico
Posts: 314
Still have a problem but I've ruled out a few things. The cistern and the irrigation pump (which sits at the bottom of the cistern) are fine.

I don't know how many gallons the cistern is but when the system is running properly we can run all four zones for 6 minutes and only use half of the cisterns water. Today if I run the first zone for 6 minutes the cistern is half full. Earlier this week I dug up the stretch of 1 1/4 between the cistern and the valve box. No leaks found.

The yard slopes down quite a bit and even when the system is perfect a lot of heads will drip water for quite some time after the zone stops - so - in zone 1 I have removed most of the heads and capped the pvc. It stills burns through water. If I let the system run for 6+ minutes zone 2 starts to water very poorly AND zone 1 seems to keep watering as well.

I could get to 2 of the valves in the box rather easily so I replaced the diaphragms. Didn't make any difference.

I might try and get some help this week to dig up the 1 1/4 lines coming out of the control valve box. I also thought maybe I would add cutoff valves on the 1 1/4 pvc where it comes out of the box - but I was worried it would let too much pressure to build up.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes