For effective distribution uniformity, irrigation heads should be positioned so that there is no less than ___ overlap.

For effective distribution uniformity, irrigation heads should be positioned so that there is no less than ___ overlap.

• A. 60%
• B. 80%
• C. 90%
• D. 100%

Answer: (B)

Distributing water evenly hinges on how much the spray patterns from neighboring heads overlap. When the wetted areas overlap enough, every point in the turf gets water from more than one head, which smooths out differences in nozzle flow, head spacing, and pressure. The minimum overlap to aim for is 80%. If overlap drops to around 60%, gaps appear between sprinklers and the distribution becomes uneven, hurting uniformity. Values higher than 80% (like 90% or 100%) would still meet the requirement, but they aren’t necessary to achieve the target and can waste water in some layouts. So, 80% is the threshold that ensures good distribution without extra unnecessary overlap.

Distributing water evenly hinges on how much the spray patterns from neighboring heads overlap. When the wetted areas overlap enough, every point in the turf gets water from more than one head, which smooths out differences in nozzle flow, head spacing, and pressure. The minimum overlap to aim for is 80%. If overlap drops to around 60%, gaps appear between sprinklers and the distribution becomes uneven, hurting uniformity. Values higher than 80% (like 90% or 100%) would still meet the requirement, but they aren’t necessary to achieve the target and can waste water in some layouts. So, 80% is the threshold that ensures good distribution without extra unnecessary overlap.