Head-to-head sprinkler spacing — square vs. triangular layout
Same head-to-head spacing S in both layouts. Square uses row spacing L = S; triangular packs rows closer, L = 0.866 × S, so every neighboring head still sits exactly S apart.
What this diagram shows
A side-by-side plan-view comparison of two sprinkler head layout patterns. On the left, four heads sit at the corners of a square, each shown with its spray-coverage circle reaching exactly to the next head — head-to-head coverage — with the spacing S dimensioned along one side and the row spacing labeled equal to S. On the right, three heads in a triangular (offset) layout show the same head-to-head spacing S along one row, but the distance to the offset second row is dimensioned as a shorter value, row spacing equals S times 0.866, so every head-to-head neighbor distance stays equal to S despite the shorter row-to-row distance. A note states that catalog precipitation-rate charts assume spacing equal to 50 percent of the head diameter.
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