| 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 |
 | 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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| 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 |
| | 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″ | | | Size of Galvanized | | 3/4″ | | 1″ | | 1 1/4″ | | Size of PVC | | 3/4″ | | 1″ | | 1 1/4″ |
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