Planning your Lawn Sprinkler System
Before we start your sprinkler system design we'll need to take a couple of readings from your outdoor spigot.
1. Water Pressure (PSI)
Optimum performance of your Lawn Belt sprinklers is based on 40-60 psi (pounds per square inch). If you are operating a water pressure between 30-40 psi special adjustments can be made (see #3 below).
Use a pressure gauge (available in our store or locally for about $8) This will give you the most accurate reading at your spigot.
Optionally you can call your local water company and ask them for the PSI at your meter.
Pressure gauge at the spigot
If attaching a gauge make sure all water sources both inside and outside the house are turned off. Then simply attach the gauge to the spigot and open the faucet fully. For a more accurate reading test two or three times during the time you'll be watering.
2. Check Your Water Flow (GPM)
Suggested GPM for your Lawn Belt sprinkler system is 8 GPM (gallons per minute).
Can you fill a bucket in 8-9 seconds?
Here's a quick and easy method to checking your GPM. Get a gallon bucket and open your spigot all the way. If you can fill the bucket in less than 10 seconds you have enough GPM.
You can also apply the following formula:
60 / Seconds to fill 1 gallon
For example if it takes 7 seconds to fill a gallon then divided 60 by 7.. or 8.6 GPM. This number is then divided by the number of heads in the kit (3). The ending result should greater than 2 for each sprinkler head.
Try out our sprinkler calculator:
Please visit our new sprinkler calculator page to calculate your GPM with our sprinkler heads.
Note: Some newer spigots have a higher restriction on the flow - meaning that your GPM reading may be slightly lower than actual.
3. Find your sprinkler coverage
On average each standard sprinkler head will spray 15 - 20 feet in diameter (with the exception of our Orbit Rotor Head - see note below).
If you have good pressure (above 60 psi) your spray may exceed 20 feet. If your water pressure reading is a under 30 psi you may consider either try removing one head from your zone or if using rotors to reduce the precipitation rate (see more about nozzles).
Adjusting the spray distance of rotor
Note: If you need broader coverage you can add a different head such as our Orbit Rotor covering up to a 20 foot radius or spray distance on average.
Kits are designed to accommodate 3 heads per zone. Additional heads can be added if PSI reading is above 60 psi.
Recommended Heads Per Zone
|Lawn Belt |
|Heads p zone:||3||4||3||2-3|
|Avg Radius(ft):||8- 10||8-10||10||20+|
Choosing the right kit for your garden
(click to open up examples for each kit)
Sprinkler Kit: Perfect for either small or large lawns.
Garden Border: For planting strips or garden mounds.
Drip Kit: For gardens, shrubs or trees.
Custom Kit: Buy a kit without heads (add your own).
For more about our kits see: Garden layout examples
Connecting multiple zones to one spigot Additional zones or kits can always be added to your sprinkler design / layout. Up to 4 zones/kits can be attach to your spigot by using a 4 way distributor in the store.
Each zone is designed to be watered separately. Zones can be watered automatically by using a battery operated timer. Otherwise you can easily open or close each valve in the zone during its watering cycle.
4. Plot your sprinkler heads
The critical step in your sprinkler system design is to decide which areas you want to water, and what kind of spray patterns you'll need.
This slideshow will walk you through how to design a Lawn Belt System.
Use the grid sheet (below) and draw the outline of your garden area. Include any obstructions such as driveways and patios. Use a tape measure for accuracy, and make sure all the areas match the scale of the grid. (Our grid scale below is 1 square = 2 feet)
Properly positioning your sprinkler locations is an important step. As you design the layout, try to maximize the amount of Lawn Belt you have while keeping track of remaining Belt left as you establish each sprinkler location.
Start by drawing a line from the spigot to your first sprinkler head (radius circle) find the radius size with the chart above. Use the spray pattern template below for best results. Locate Sprinkler Heads After printing out both sheets, locate your spigots on the garden plot. As you place each circle and head location try to achieve the most uniform coverage. You can accomplish this by overlapping each circle into the next by a few feet (this will create an over spray so you won't get any dry spots in your lawn or garden).
When to use half or quarter rounds- To keep walkways or driveway areas from overspray use ether 1/4 or 1/2 rounds and place flat part of the spray against the edge of walkway. Where sharp corners occur use a 90 degree sprayer if possible.
Note: The Orbit Rotors & Softops heads are fully adjustable to any angle. The standard heads are fixed angles and spray 360 degrees. Sprayers also are available in different angles and be used with the Custom Kit.
5. Calculate the length of each zone
Next, connect the zones together by drawing a curved line starting from your spigot and then to the center of each spray pattern.
Remember to avoid any tight turns in your layout - use large sweeping turns instead when connecting one head to the next.
Then add the total distance of Lawn Belt from your spigot to the end of each zone.
If this distance is over 50 feet (the length of a kit) you will need to extend Lawn Belt using additional Lawn Belt plus a coupler kit available in our store.
Here's a printable grid sheet and spray pattern template to easily plot your sprinkler system design:
Grid sheet for your design.
Sprinkler spray patterns.
To use the printable grid sheet, simply cutout the spray patterns and design your sprinkler system for maximum coverage.
Acrobat reader is required (its free) Click on each image to view and print on 8 1/2" × 11" paper.
What do I need to do next?
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