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You are here: Home > Sprinkler School™ > Sprinkler System Basics > Sprinkler System Design and Installation > Helpful Worksheets And Irrigation Equations
Helpful Worksheets & Irrigation Equations

Helpful Worksheets & Irrigation Equations

Sprinkler System And Irrigation Basics

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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.


Determine the Percentage of Slope
How to Determine 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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Graph Paper
Blank Graph Paper

Irrigation
Checklist
Irrigation Checklist
Gauge
Maximum Distance
18
1000 ft
14
1450 ft
10
1750 ft
10
1750 ft
Valve Inlet Size
Size of Inlet
Gallons Per Minute (GPM)
3/4"
> 0-10
1"
> 10-20
1 1/2"
> 20-30
2"
> 30-150
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.

PVC Pipe / Class 125
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.

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"

Determining the Amount of Zones

Calcuating How Many Zones Are Required

Product Peformance Charts

Rotor Performance charts

Rotor Performance Charts


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