Self-Draining vs. Conventional Sprinkler Systems:What Omaha Homeowners Need to Know

If you're considering a new sprinkler system in Omaha — or you've recently moved into a home with an existing one — you may have heard the term "self-draining" and wondered what it actually means. It's not just industry jargon. The difference between a self-draining and a non-self-draining system affects how much you spend, how much maintenance is involved, and how well your system holds up through Nebraska winters. Here's a straightforward breakdown of both so you can make an informed decision.

What is a non-self-draining system?

A non-self-draining sprinkler system — sometimes called a conventional or blow-out system — holds water in its underground pipes at all times. When the system runs, water flows through the mainline and lateral lines to each zone. When it shuts off, that water stays sitting in the pipes rather than draining away.

This works fine during the irrigation season, but it creates a serious problem when temperatures drop below freezing. Water expands when it freezes, and if there's water trapped in your pipes, heads, or valves when a hard freeze hits, the pressure can crack pipes underground, split valve bodies, and break sprinkler heads. The damage often isn't visible until spring, when you turn the system back on and discover you have a flooded yard, dead zones, or heads that no longer pop up.

To prevent this, non-self-draining systems require a professional fall winterization blow-out every year. A technician comes out with an air compressor, connects it to the system, and forces compressed air through each zone to push the remaining water out of the pipes. It's effective — but it's an extra service call every fall, an added expense, and something you have to remember to schedule before the first hard freeze arrives.

What is a self-draining system?

A self-draining sprinkler system uses automatic drain valves installed at the low points of each zone. When the system runs, water pressure keeps those valves closed so water flows normally through the pipes. When the system shuts off and the pressure drops, the valves open automatically and the remaining water drains naturally out of the lines.

The result is that after every watering cycle, your pipes are empty. There's no water sitting in the lines waiting to freeze. When winter arrives, your underground pipes are already dry — no blow-out required, no compressor, no service call just to remove water from the system.

Nearly every system that Alternate Rain installs is self-draining. It's been our standard approach for over 40 years, and it's one of the things that consistently sets us apart from other irrigation companies in the Omaha area.

The key differences side by side

When it comes to winterization, a non-self-draining system requires a professional blow-out every fall at an additional cost, while a self-draining system simply requires draining the backflow preventer — something most homeowners can handle themselves with a quick walkthrough. On the topic of freeze damage risk, conventional systems are highly vulnerable if the blow-out is skipped or done too late, whereas self-draining systems have minimal risk since the pipes are already empty going into winter. As far as long-term wear on components, the repeated use of compressed air during blow-outs puts stress on head seals and internal parts over time, while self-draining systems avoid that stress entirely since no compressed air is ever used. And in terms of simplicity and cost, non-self-draining systems carry an ongoing annual expense for winterization services, while self-draining systems reduce that burden significantly every season.

One important note about self-draining systems

Even with a self-draining system, there is one component that still requires attention every fall — the backflow preventer. This is the device installed where your irrigation system connects to your home's water supply, and it protects your drinking water from contamination. Because the backflow preventer holds water and is typically located above ground or just below the frost line, it needs to be drained or properly insulated each fall regardless of whether your system is self-draining.

You can find detailed instructions for winterizing your backflow preventer on our Sprinkler System Info page, and we're always happy to walk new customers through the process during their first spring startup. It's straightforward once you've done it once, and our team is happy to answer questions anytime.

What if I already have a non-self-draining system?

If your home has an existing sprinkler system that was installed by another company, there's a good chance it's not self-draining — particularly if you've been scheduling annual blow-outs. If you're not sure, the easiest thing to do is give us a call. We can assess your system during a repair or service visit and tell you exactly what you're working with.

In some cases, it's possible to retrofit automatic drain valves into an existing system to make it self-draining. Whether that's feasible depends on how the system was designed and where the low points in each zone fall. It's not always a straightforward retrofit, but it's worth exploring if you want to eliminate the annual blow-out. You can also read through our FAQs page for more information on what to expect from a system assessment.

Which is better for Omaha?

Given Nebraska's climate — where temperatures regularly drop well below freezing between November and March — a self-draining system is almost always the better choice for residential properties in the Omaha area. The winters here are cold enough and unpredictable enough that skipping or delaying a blow-out on a conventional system can result in expensive underground repairs come spring.

Our Seasonal Care Packages are designed with self-draining systems in mind. Because blow-outs aren't part of the equation, our startup and winterization visits focus entirely on making sure your system is running at its best — checking heads, testing zones, adjusting coverage, and getting you set for the season ahead — rather than spending time and money just removing water from pipes.

The bottom line

If you're getting a new system installed, the choice is simple — ask for self-draining. If you have an existing system and aren't sure what type it is, it's worth finding out. Either way, understanding how your system works is the first step toward taking better care of it.

To get a free estimate on a new self-draining installation, or to have your existing system assessed, give us a call at (402) 289-4019 or reach out through our website. We're happy to help Omaha homeowners make the right call for their property.