Buzz
Drip irrigation systems are highly efficient for several reasons. By delivering water precisely where it’s needed, you can reduce water usage by up to 70%. Traditional hand watering often wastes water on plant tops, which don’t benefit from it. Drip systems target the roots, ensuring plants get the hydration they require.
Overhead watering poses another issue: it disrupts soil microbes by splashing water onto the ground, which then rebounds onto plants, spreading diseases. Drip irrigation avoids this by gently releasing water into the soil, maintaining a healthier garden environment.
The most compelling reason to switch to drip irrigation is the time it saves. While I love my garden, I don’t enjoy dragging hoses around or spending hours under the sun. With drip irrigation and a timer, I can leave my garden knowing it’s being cared for properly, even when I’m away.
What exactly is drip irrigation for your garden?
Drip irrigation is an underground system that channels water from your main supply line, passing through a backflow preventer, directly to your garden. It starts with a manifold, which divides the water into multiple lines and zones, and is connected to a timer that controls when the valves open and close. While it may sound complex, it’s manageable to set up yourself and offers significant long-term benefits.
Why cheaper alternatives to drip irrigation fall short
The market offers numerous products that mimic drip irrigation but don’t deliver the same results. For instance, soaker hoses connect to a hose bib and slowly release water into the soil, and can be paired with timers. Another option is ollas, which are porous terra cotta pots buried in the ground to gradually release water and attract nearby plant roots. (Ollas have been used by Native Americans for centuries in gardening.)
However, all these systems come with significant limitations. For example, drip systems connected to a hose bib are often illegal in many states due to the lack of backflow prevention—ensuring water doesn’t flow back into the supply. Regulations vary by state, but searching “backflow, hose bib, (your county)” will clarify local rules. In some cases, an affordable and easy-to-install inline backflow device suffices, while other situations require professional installation tied to the main water line.
From my experience, soaker hoses degrade quickly under sunlight and face pressure-related issues. The low gallons per hour (GPH) from a hose bib limits their effectiveness, as proper pressure is crucial for consistent water distribution. This is why most irrigation systems are connected to the main water supply.
Ollas are excellent for remote areas, ensuring water reaches plant roots, but they require a large quantity and can be costly unless you’re a potter. Made of under-fired clay, they’re fragile and need to be removed and stored carefully during winter to avoid cracking. Additionally, frequent refilling is necessary. After years of using ollas, I transitioned mostly to drip irrigation.
How to design drip irrigation zones for your garden
When I finally committed to installing drip irrigation, I took the most mature step in my gardening journey: measuring my garden. I created a detailed graph, mapping out all the spaces, boxes, the water main location, hose bib, and more. Here’s what it looked like.
Next, I began dividing the garden into zones and sketching where the pipes would run on the diagram. The goal was to minimize pipe length, reduce turns, and avoid overlapping lines. Feeling confident, I sought advice on a Reddit landscaping forum. With their input, I finalized a plan that everyone approved, and I picked up useful tips, such as using two clamps per pipe and arranging drip lines in circles instead of straight lines.
Essential materials for setting up drip irrigation
Your primary irrigation lines will be 17mm in diameter, requiring 17mm fittings. You can choose the spacing and size of the holes, measured in GPH (gallons per hour). For instance, vegetable beds may need closer holes, while shrubs might require fewer. Delicate plants like tomatoes may need larger holes for more water, whereas blueberries, often overwatered, need smaller ones. Additionally, there’s blank tubing, identical in appearance but without holes, used to direct water to specific areas.
You’ll also need various fittings—tees, elbows, crosses, and an abundance of clamps. I suggest ordering extra and returning any unused parts.
Trenching
Eventually, you’ll need to bury the pipes below the frostline, which varies by county. This meant digging numerous trenches across my yard. Fortunately, the spring rains softened the ground, making the task easier. I used a trenching shovel, which is narrow and efficient. If space allowed, renting a trencher would have been ideal.
While trenching, you’ll likely encounter pavement, requiring you to either tunnel under or cut through it. Most opt for tunneling, using a special hose tip attached to a PVC pipe to push through the mud beneath. Alternatively, you can use a metal pipe, though it’s labor-intensive. Augers can help navigate under sidewalks and partially under driveways. In my case, after multiple attempts with water, I cut a narrow channel in the concrete, dug the trench, and re-cemented it. The entire process took 90 minutes and $300. Renting a saw next time will save time and money.
The manifold and timer setup
Water flows from the main line through a single hose, which then splits into multiple hoses directed to different areas. Valves control when water is sent or stopped, and this setup is called a manifold. Essentially, you’re creating a branching PVC system with electronic valves, designed to fit compactly in an underground box. This system must also include inline filters, blowout valves, and manual ball valves. While pre-made manifolds are available, I found great satisfaction in building my own and learning about PVC connections to optimize efficiency.
The key component that controls the valves and allows for worry-free vacations is the timer. Modern wifi-enabled timers can sync with local weather stations, adjusting watering schedules based on real-time weather conditions. They can also be managed remotely via your phone. Surprisingly, these advanced timers aren’t much more expensive than traditional ones. I chose the Hydrawise timer, connecting it to a nearby weather station I hadn’t known existed. The setup process took about 30 minutes.
Youtube tutorials were a lifesaver for understanding the necessary supplies and wiring my manifold valves to the timer. Once I grasped the process, it became straightforward: Each valve has a colored wire and a common white wire. I could either connect all the white wires to the timer or daisy-chain them from one valve to another, bringing only the final wire to the timer.
The results
Installing the drip system and digging trenches was one of the most physically demanding tasks I’ve undertaken. While I only saved about 30% compared to professional installation costs, the effort was worth it. Had I hired professionals, I wouldn’t have understood how the system works, known where the pipes were, or been able to customize their placement and branching.
I eventually installed ¼” microdrip lines branching off the 17mm main lines for potted plants, added micro sprayers to function as lawn sprinklers, and included an emitter to keep a birdbath filled. These customizations were only possible because I built the system myself.
Last summer, my water bill dropped by 50%, the outcome I had eagerly anticipated. Using the Hydrawise app, I could track weekly savings and understand why the timer adjusted watering levels. While it will take years to recoup the full investment, the benefits made it worthwhile.
My garden experienced its most productive and disease-free season ever, and I could enjoy weekend camping trips without stressing over the yard.
