Landscaping services
Sprinkler system installation: zoning, sensors and a schedule
How a sprinkler system is designed, where the water savings are, what belongs in the scope, and how to measure what your zones apply.
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Written by HyreYard Research Desk Primary-source research and fact checking
The short answer
An irrigation system saves water only when it is designed and scheduled to. Zones grouped by plant need, a rain or soil moisture sensor, and run times adjusted through the season save water.
The same pipe and heads on a fixed clock waste it. EPA WaterSense says as much as half of outdoor irrigation water is wasted through overwatering.
What should you know before buying an irrigation system?
EPA WaterSense: “The average American household uses more water outdoors than it uses for showering and washing clothes combined.”
A zone gives the same water to everything on it. Lawn and shrubs, sun and shade, slope and flat, spray and rotor heads belong on separate zones.
Run time means nothing until you know inches per hour. Six straight-sided cans and ten minutes give you that number.
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What does a poorly performing system look like?
A system can work fine and still be mis-scheduled or mis-zoned. These checks separate the two, and they are free.
The zone applies water faster than the soil absorbs it. Split the run into shorter cycles with soak time between.
No sensor, or one that is disconnected. It is the most visible waste and a cheap fix.
A design fault no schedule can fix, because the two apply water at very different rates.
Spacing or pressure. Each head should throw to the next, and where that overlap fails you get a dry arc.
Pressure is too high. Fine droplets drift and evaporate before they land.
Arcs never adjusted, or heads knocked out of line by a mower.
A leak or a failed seal. An underground leak shows only on the bill and in that wet patch.
A fixed schedule through the whole season. The seasonal percent key on the controller is the quick fix.
Which parts decide whether a system wastes water?
Irrigation quotes are written in parts. The parts that decide efficiency are not the expensive ones.
| Part | What it does |
|---|---|
| Spray heads | Fixed pop-ups with a short throw and a high rate. CSU Extension: “Pop-up spray heads typically apply 1-2½ inches of water per hour, whereas rotor heads only deliver ¼ to ¾ inch of water per hour.” |
| Rotors | Rotating streams with a long throw and a low rate. They need much longer run times to apply the same depth. |
| Drip | Emitters that deliver water at the soil by each plant. The fit for beds, shrubs and trees, on their own zone. |
| Zones and valves | The design itself. Every plant on a zone gets the same water for the same time. |
| Controller | Sets when and how long each zone runs. Look for the WaterSense label rather than the word “smart.” |
| Rain or soil sensor | Stops a cycle when water is not needed. A soil sensor reads what the soil holds, not just what fell. |
| Backflow preventer | Keeps irrigation water out of the drinking supply. Plumbing code governs it, and it can need a permit and periodic testing. |
| Pressure regulation | Too high and nozzles mist; too low and the spray pattern collapses. |
What should a designer measure before drawing zones?
A design that starts with a head count starts in the wrong place. These set the limits the design must work within.
Measured, not assumed. Every zone boundary follows from how much water can move at once.
What local code requires, who pulls the permit, and who tests the device.
Lawn, shrubs, trees and drought-tolerant beds are different zones.
A shaded zone and a full-sun zone need different run times. Slopes need cycle and soak.
The Web Soil Survey gives the hydrologic soil group, a guide to how fast water can soak in.
A system that needs long runs is no use where watering is allowed two mornings a week. See our watering restrictions tracker.
How is an irrigation system installed?
The design steps decide whether the system can ever run efficiently. Trenching and pipe are the visible part.
Gallons per minute and static pressure at the source. Every zone is sized against those numbers.
By water need, sun and slope. This sets how efficient the system can ever be, and no controller fixes it later.
One head type per zone, with nozzles matched so the whole zone applies water at the same rate.
Each head throws to its neighbor. Stretching the spacing to save heads leaves dry arcs.
Call 811 before digging so buried utility lines are marked. Then lay the mainline, laterals, valves and wiring, and pressure-test before backfilling.
The device that keeps irrigation water out of the supply, installed and tested as local code requires.
Flush with the finished grade, with each arc aimed at planting, not paving or walls.
A catch-can test per zone, then a zone map, measured rates and run times in writing. CSU Extension: “If the amount of water in some containers is significantly more or less than others, the system is poorly designed, or head(s) are malfunctioning.”
Where are the water savings?
The first three are settings on the controller. The rest cost money.
| Change | What it does |
|---|---|
| Turn the schedule down | Free, and it targets EPA’s finding on outdoor water: “as much as 50 percent of this water is wasted due to overwatering caused by inefficiencies in irrigation methods and systems.” |
| Cycle and soak | A controller setting. CSU Extension: “On slopes or compacted, clayey soils, water is generally applied faster than it can soak into the soil, resulting in water being wasted as it runs off-site. The cycle and soak approach cuts the irrigation period into multiple short runs with soak-in time in between.” |
| Water at night or early morning | CSU Extension: “Many water providers encourage homeowners to water their yards between 9 p.m. and 9 a.m. Winds are typically less at night, and evaporation loss will be lower.” |
| Add a rain or soil sensor | Low cost, and it stops the system watering in the rain. |
| A WaterSense-labeled controller | EPA estimates about 15,000 gallons a year per household, and 390 billion gallons a year if adopted nationally. |
| Move beds to drip | Removes spray drift and evaporation from everything that is not lawn. |
| Re-zone | Costly and disruptive, and the only real fix where lawn and beds share a zone. |
| Less irrigated lawn | Some utilities pay rebates for replacing lawn. See our turf rebate study. |
More heads help only where the finding is a gap in coverage between existing heads.
What belongs in an irrigation scope?
Irrigation is buried within a day, and its performance is invisible unless someone measures it. A quote with only a zone count and a head count describes hardware.
In gallons per minute and psi, with the design stated against them.
What is on each zone and why: plant type, sun and slope.
Stated in writing, with matched nozzles.
Pipe type, size and burial depth, and how it drains or is blown out where winters freeze.
Device type, who pulls the permit, and who does the testing.
Sensor type and mounting, how it is wired in, and whether the controller is WaterSense labeled.
Inches per hour from a catch-can audit, with the starting run times, in writing.
Mainline, laterals, valves and wiring, plus who calls 811 before digging, and when.
An irrigation fault does not crack like a patio. It shows up as a brown arc, a wet corner or a water bill, and gets blamed on something else. The paperwork is your defense.
What moves the price of an irrigation system?
Irrigation is priced on zones, trench length and the connection. The parts that decide efficiency are a small share of the total.
| Factor | Why it changes the number |
|---|---|
| Number of zones | Each zone is a valve, wiring and a controller station. Proper zoning raises the count, and it is the part worth paying for. |
| Available flow | Low flow at the source means more, smaller zones for the same coverage. |
| Trench length and crossings | Boring under a drive or path is its own operation with its own price. |
| Connection and backflow | Plumbing work under local code, sometimes by a licensed trade. It varies more by place than by yard. |
| Heads and drip | Rotors cover more ground per head than sprays. Drip is priced by run length and emitters. |
| Restoring the yard | Putting lawn and beds back over the trenches. Least costly when irrigation goes in before sod. |
| The water itself | One inch over 1,000 square feet is 623 gallons. Multiply by your area, your inches per season and your rate. |
HyreYard publishes no installed price per zone. The running cost is arithmetic on your own bill, and the lawn water cost calculator does it with your rate.
Before you add heads, measure what the ones you have apply.
A zone that “does not water enough” can be applying water faster than the soil takes it, or running a default time. Measure it.
CSU Extension: “Place six identical, straight-sided, flat-bottomed cans randomly around the area between sprinkler heads in the same zone. Turn on the sprinklers for exactly ten minutes. Pour all the water into one can. With a ruler, measure the depth of the water in the can. This is your precipitation rate in inches per hour.”
With that number per zone, a schedule is arithmetic. Without it, every run time is a guess.
What to ask an irrigation installer
And how do the zones follow from them?
And why: plant type, sun, slope?
If so, why?
Who pulls the permit, and who tests it?
Where is it mounted, and will you test it at handover?
In inches per hour, from a catch-can test.
Showing mainline, valves and wiring.
What to gather before a designer visits
Note the rate and whether it is tiered.
Allowed days, and any controller or lawn rebates from your utility.
It sets zone boundaries more than bed outlines do.
The controller, valve boxes, backflow device and any old drawing.
Which irrigation choices waste water for years?
Whatever run time you pick, one part of that zone gets the wrong amount.
Turf and shrubs want different water, so one is overwatered every run. The fix is re-zoning.
Plant demand changes across the season. CSU Extension: “The controller would be set for the July/August irrigation schedule. The percent key would be set at 50%, 67% or 100%, based on the season.”
EPA WaterSense: “Watering plants or grass too frequently can drown plants or result in shallow roots.”
EPA’s target includes rainfall: “Your landscape will typically require one inch of water a week, including rainfall, and that can vary depending on where you live, recent weather, and the plants in your landscape.”
Without a zone map, measured rates and an as-built, every future repair starts from nothing.
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Questions
Does an irrigation system save water?
How many irrigation zones do I need?
How long should I run each sprinkler zone?
Is a smart irrigation controller worth it?
Do I need a rain sensor?
Why is one part of my lawn always dry?
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