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Jess Stryker's Landscape Tutorial Series

Jess Stryker's Landscape Tutorial Series
 
Landscape Irrigation Formulas
 

Quick Index by Formula Type:

Metric to U.S. System Conversions
U.S. To Metric Conversions
Area and Distance Conversions
Water Pressure Conversions
Flow and Water Volume Conversions
Pump Calculations
Miscellaneous Irrigation Formulas
Friction loss calculator

Lots more conversion formulas and calculators can be found at Frank Tapson's "A Dictionary of Units"


Metric to U.S. System Conversions, Calculations, Equations, and Formulas:

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U.S. to Metric Conversions, Formulas, Calculations, and Equations:

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Area and Distance Conversions, Equations, Calculations, and Formulas:

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Water Pressure Equations, Conversions, Formulas, and Calculations:

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Flow and Water Volume Formulas, Conversions, Calculations, and Equations:

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Pump Calculations, Conversions, Equations, and Formulas:

The following formulas assume 55% pump efficiency (the standard assumption).

Note: Horsepower is Brake horse power for an electric motor. Do not use for fuel-powered pump engines!

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Miscellaneous Irrigation Formulas, Conversions, Equations, and Calculations:

Sprinkler Precipitation Rate:

Note: "head spacing" is the distance between sprinkler heads. L = length between heads in the row, W = width between rows. Therefore "head spacing " = L x W. Use the GPM value for a full circle sprinkler. So if your sprinklers are all half circles, you need to double the GPM value so it is equivalent to a full circle value.


(GPM of full circle sprinkler x 96.3) / head spacing in feet = precipitation rate in inches per hour


(GPM of full circle sprinkler x 96.3) / (head spacing in feet x 0.866) = precipitation rate in inches per hour


Example: Rotors arranged in rows. The rows are 25 feet apart and the sprinklers are 30 feet apart in the row. The heads are arranged in a triangle pattern. The heads use 6 GPM.

(6 x 96.3) / [(25 x 30) x 0.866]

577.8 / [750] x 0.866

577.8 / 649.5

0.89 inches per hour

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Friction Loss Calculators


Here's a Java powered friction loss calculator for your Java enabled browser. It works with the latest versions of both Netscape and Internet Explorer. Because it is true Java you don't need to be online to use it!

FRICTION LOSS CALCULATOR FOR PVC PIPE

Instructions:

    1. Select pipe type.
    2. Select pipe size in inches.
    3. Enter GPM flow through this section of pipe.
    4. Enter the pipe length.
    5. Click on calculate.

This program is Freeware and may not be sold.

Java programming by Dan Rasmussen, methodology by Jess Stryker, ©1999.


There is also a stand-alone Win95 friction loss calculator created by Steve Granger. Use the value of 1 for both the Specific Gravity and Viscosity of water when using this calculator. Under the heading Material, "Plastic" is PVC plastic. The current version doesn't work for poly plastic. The windows calculator will calculate friction losses for galvanized steel and pipe materials other than plastic. Download the calculator from http://www.IrrigationTutorials.com/LineSize.exe. Many thanks to Steve for creating this calculator and providing it free for everyone to use.


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