The basics of an underground irrigation system
Here is a short video explaining the basic operation of a underground irrigation system.
Usually an irrigation system is quoted/estimated by number of required zones. Roughly $500 to $700 per zone. Price depends on location, logistics of install, permits, regulations, and complexity of the system. You will most likely incur other expenses such as deduct meter and required permits. There is also going to be a minimum charge for very small systems.
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The deduct meter is used to deduct the amount of water you use from your waste water bill. Not necessary if your on a septic system.
The main lines are charged or under constant pressure. Or until the system is winterized. The lateral lines are only charged/pressurized when the control valve is activate.
Zones: An irrigation system waters a lawn in sections. I.e. front, back, sides etc. These sections are referred to as zones.