On my 4 sprinkler stations, two has less water pressure, two are okay. What seems to be the problem?
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How did they work last year? If the pressure was good last year, then most likely have a leak in each of the zones. It is possible the valves aren't opening all the way, and it is also possible that roots are crushing the pipes. Walk the areas of the zones that have low pressure, and look for a spot that is very wet, there is the leak. If the valve is not opening all the way, then open it manually. Use the thumb screw on top or turn the solenoid about 1/2 turn counter clockwise. It will open all the way. Also check to see if the shut off valves are open all the way. There should be two on the backflow and one in your basement or crawl space. If you have a gate valve, it may not be opening all the way. If you seem to find no problems that could cause the low pressure, put smaller nozzles in the heads if they are changeable and run the zone longer. Eventually the roots will break the pipe and you can fix the problem. If this is a new system, then just check to see that the water is on all the way then put smaller nozzles in the heads. It is possible that it wasn't designed properly.
not enough water
Sounds like two stations have more heads than the other two. Need more info to diagnose further.
one could have a leak.
you probable have a leak in the other 2 that has Les pressure some where down the line
If your two sprinklers that have low pressure is quit a distant away from the two that have good pressure you will need to use a bigger diameter supply pipe to the two that don't have good pressure. No if the two that don't have goo pressure in not that fare you will need to use a bigger supply pipe from the shutoff valve for all your sprinkler. It is a matter of flow.
If they used to work okay I'd say your valves aren't opening all the way. If it's always been this way check to make sure all the heads are the same type on a zone - all impacts or all spray heads. If they're not you'll get flaky things going on.
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