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The pipe trenches for an in-ground irrigation system should be at least seven inches underground, but no more than 10 inches. Seven to 10 inches is the sweet spot for irrigation line depth because the pipes can crack if they're too close to the surface. If the lines are installed too deep, it becomes much harder to detect leaks and the condition the pipes are in.

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. 

Like anything else, sprinkler pipes will freeze if the temperature falls below freezing, which is 32 degrees Fahrenheit (or 0 degrees Celsius). However, winterizing your sprinkler system is a relatively simple (if somewhat time-consuming and tedious) process, and it can help ensure your system won’t be damaged over the winter, even if it does freeze.

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.