Nozzles on the heads are critical, they come with different GPM and arc specs.
Water pressure is critical as well, your average home water supply is usually in the 60-80 psi range and usually that is too much for your average home pop up head. You end up with too fine of a spray that is prone to wind drift so a regulator or flow control at the solenoid valves may be required. The flow control does nothing for the pressure, but at least allows you to reduce the flow so you get a gentle drizzle instead of a hurricane spray and the water ends up everywhere but where it needs to be.
The system needs to be balanced with GPM, pressure, head/nozzle selection and head to head coverage.
Toro,RainBird and Hunter all have very helpful tips on their websites as well as the CSU Agricultural extension.
Two a day watering schedules also have a big advantage on Colorado soil. If you run a single say, 30 minute time for each zone a good amount of the water you are putting down runs off or puddles.
Split that into two 15 minute cycles and the first watering has a chance to soak in and then the soil is much more receptive to the second cycle.



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