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Helpful Worksheets & Irrigation Equations
Having a hard time figuring out how to measure a slope or calculating how many zones you need? Not a problem, below are some helpful tools to help you figure it out.
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Determine the Percentage of Slope |
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Divide the measure of height by the measure of the length and multiply by 100.
Example above: 2 divided by 14 times 100 = 14.3%
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Graph Paper |
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Irrigation
Checklist |
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Timer to Valve Wire Sizing Chart |
Gauge |
Maximum Distance |
18 |
1000 ft |
14 |
1450 ft |
10 |
1750 ft |
10 |
1750 ft |
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Size of Inlet |
Gallons Per Minute (GPM) |
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> 20-30 |
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> 30-150 |
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PVC Pipe / Schedule 40
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PVC Pipe / Class 200
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Max GPM Flow |
Pipe Size |
Valve Size |
Max GPM Flow |
Pipe Size |
Valve Size |
> 0-4 |
1/2" |
1/2" |
> 0-6 |
1/2" |
3/4" |
> 4-8 |
3/4" |
3/4" |
> 6-10 |
3/4" |
3/4" |
> 8-12 |
1" |
1" |
> 10-16 |
1" |
1" |
> 12-22 |
1 1/4" |
1" |
> 16-26 |
1 1/4" |
1" |
> 22-30 |
1 1/2" |
1 1/2" |
> 26-35 |
1 1/2" |
1 1/2" |
> 30-50 |
2" |
2" |
> 35-55 |
2" |
2" |
Use this chart to size your pipe according to GPM needed for each zone.
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PVC Pipe / Class 125
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Poly Pipe / Galvanized Pipe
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Max GPM Flow |
Pipe Size |
Valve Size |
Max GPM Flow |
Pipe Size |
Valve Size |
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- |
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> 0-4 |
1/2" |
1/2" |
>0-10 |
3/4" |
3/4" |
> 4-8 |
3/4" |
3/4" |
>10-15 |
1" |
1" |
> 8-12 |
1" |
1" |
>15-24 |
1 1/4" |
1" |
>12-22 |
1 1/4" |
1 1/4" |
- |
- |
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> 22-30 |
1 1/2" |
1 1/2" |
- |
- |
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> 35-50 |
2" |
2" |
Use this chart to size your pipe according to GPM needed for each zone.
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Flow Rates for Service Lines
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Length of String |
2 3/4" |
2 1/4" |
3 1/2" |
4" |
4 3/8" |
5" |
Size of Copper |
3/4" |
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1" |
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1 1/4" |
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Size of Galvanized |
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3/4" |
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1" |
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1 1/4" |
Size of PVC |
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3/4" |
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1" |
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1 1/4" |
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Determining the Amount of Zones
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Product Peformance Charts |
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