| By using the diagrams below, you can accurately measure a slope and calculate how many zones you’ll need to install your irrigation system. Sprinkler Warehouse recommends that you download these helpful worksheets & the irrigation equations to follow these charts step by step. |
| 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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Blank
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) |
| 3/4″ |
> 0-10 |
| 1″ |
> 10-20 |
| 1 1/2″ |
> 20-30 |
| 2″ |
> 30-150 |
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| PVC Pipe / Schedule 40 |
PVC Pipe / Class 200 |
| 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 |
Poly Pipe / Galvanized Pipe |
| Max GPM Flow |
Pipe Size |
Valve Size |
Max GPM Flow |
Pipe Size |
Valve Size |
| – |
– |
– |
> 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″ |
| – |
– |
– |
> 22-30 |
1 1/2″ |
1 1/2″ |
| – |
– |
– |
> 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 |
| Length of String |
2 3/4″ |
2 1/4″ |
3 1/2″ |
4″ |
4 3/8″ |
5″ |
| Size of Copper |
3/4″ |
|
1″ |
|
1 1/4″ |
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| Size of Galvanized |
|
3/4″ |
|
1″ |
|
1 1/4″ |
| Size of PVC |
|
3/4″ |
|
1″ |
|
1 1/4″ |
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