Jess Stryker's
Landscape Sprinkler Design Tutorial
Step #3
Sprinkler GPM
|
Jess Stryker's |
As we saw previously, the flow rate in gallons per minute (GPM) of each sprinkler head is determined by the nozzle installed in the head. It is necessary to know the GPM for each head in order to determine which heads will be connected to each valve and in order to determine the size of each pipe in the sprinkler system.
You will probably need to dig up the sprinkler manufacturer's literature again. In the literature the manufacturer shows different GPM and radius information for each sprinkler nozzle based on the operating pressure (PSI). Now we can use that information to find the GPM for each sprinkler head. First, determine what the SPACING is between each head and the others around it. Next, look for the radius closest to that spacing and use the corresponding GPM as the flow for the head.
Write down on your plan the GPM for each sprinkler next to the sprinkler symbol.
Hint: You will find the GPM and radius data for many of the popular sprinklers in the product reviews .Example: You note that a spray type head on your plan is a 1/2 circle pattern and the distance to the 3 closest adjacent heads are 13 feet, 12 ft., and 14 ft.. So the spacing for this head is 14 ft. (the highest of the 3). Looking at the manufacturer's literature you note that a radius of 14 ft. for the 1/2 circle nozzle in this sprinkler requires a pressure of 25 PSI and a flow of 1.65 GPM. Write down the flow of 1.65 GPM next to the sprinkler head on your drawing. You then repeat this procedure for each sprinkler head on your drawing.
Previous Page of Tutorial Sprinkler Design Tutorial Index Next Page of Tutorial
Glossary Conversion Formulas
About the Author
Comments? Questions? Product Data & Reviews More Irrigation Tutorials!
Use of this tutorial is subject to the conditions and limitations listed on the disclaimer page.
Jess Stryker's Irrigation Tutorials
Copyright © Jess Stryker, 2001
All rights reserved.
