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You can find irrigation lines whether you dig or not. If you decide to dig, do so near valve boxes and around sprinkler heads. Once you find the first pipe, you can map the system from there and use spray paint or tape to mark the pipe layout throughout.  

If you don’t feel like digging, aside from getting a map from the maker of the irrigation system, you can still find irrigation lines by locating the valve box and following a line back to the head sprinklers. You can also use a water-detection device or a metal detector, which will work if the lines have metal tracer wires.

Lawn irrigation is the process of getting water to your lawn, grass and all, for it to grow. There are five main types of lawn irrigation methods:

• Manual irrigation puts you in charge of the flow of water. Using a sprinkler head on your hose is best to evenly distribute the water across your entire lawn. This doesn’t take much time but requires you to be physically outside holding the hose. 

• Above-ground sprinklers attach to your hose and rotate or oscillate around your lawn. Since these are above-ground, they’ll need to be moved when it’s time to mow, and depending on the size of your property, you might need to move it around your yard for full coverage. 

• In-ground sprinklers are flush with the ground when not in use but pop up above the ground level when it's time to water the lawn. Piping for these sprinklers is all found underground, and there are different types of sprinkler heads for different uses and lawn sizes. 

• Drip irrigation involves drip lines that are more efficient than sprinklers for more extensive lawns. This involves a lot of digging since they are installed underground, but it makes it easy for you to mow.

• Rainwater collection and irrigation uses nature’s precipitation to water your lawn. This option might not be available in every area since semi-reliable rainfall is needed, though the barrels for this system can range from 15 gallons to 10,000 gallons or more.

Sprinkler systems are usually worth the investment, not only because they appeal to buyers when you sell your home but also because they help keep your lawn looking beautiful, which can increase curb appeal. In fact, you can expect a return on investment for a sprinkler system to sit between 80% and 90%, making it a better home improvement project than most in terms of value. It’s crucial to hire a sprinkler system professional for installation to ensure maximum value, as that will confirm for buyers that the system will likely last for years without issues.

You can calculate the number of sprinklers per zone by looking at your water pressure (PSI), flow rate (GPM), and the performance of your sprinkler. Depending on the water pressure, the sprinkler head will use different amounts of water. As an example, at 40 PSI, a rotor head might use 3.5 GPM. If your water capacity is 10 GPM, you can place three heads in each zone.