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Sprinkler Density based on Rectangular or Triangular Spacing

This calculator estimates the number of sprinklers required per acre based on different spacing. Lateral spacing is the distance between sprinkler heads in the lateral, while line spacing measures the distance between the lateral sets, or the distance between sprinkler heads in the other direction from the lateral spacing measurements. For triangular spacing, the distance between sprinkler heads is the same distance between all nearest sprinklers (equilateral triangles). The head density is the number of sprinkler heads per area.

Learn more about the units used on this page.

Rectangular Spacing

Lateral Spacing:
Line Spacing:
Sprinkler Head Density:

Triangular Spacing

Line Spacing:
Sprinkler Head Density:

The Equation

These calculators use these formulas to determine sprinkler density

Rectangular Spacing

Rectangle Sprinkler Density Calculation Equation

Where:

Sprinkler head density= Sprinkler Head Density (heads/acre)

Lateral Spacing= Lateral Spacing (ft)

Line Spacing= Line Spacing (ft)

Triangular Spacing

Triangle Sprinkler density equation

Where:

Sprinkler head density= Sprinkler Head Density (heads/acre)

Lateral spacing= Lateral Spacing (ft)

Line Spacing= Line Spacing (ft)

Reference: Washington State University

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