What is the 3x rule for sprinklers can refer to several guidelines, but most common interpretation in irrigation and lawn care is that you should water 3 times per week, or that sprinkler heads should have head to head coverage with spacing at about 3 times something, or fire sprinkler rule about spacing. In lawn irrigation, 3x rule often means water 3 times per week for about 20 to 30 minutes per zone to provide 1 to 1.5 inches per week, rather than daily light watering, promoting deep roots. In sprinkler design, there is rule that rotor heads should be spaced with head to head coverage and distance about 3 times something for uniformity. In fire protection, 3x rule may refer to sprinkler spacing relative to ceiling height. Another version says sprinkler precipitation should be matched and run 3 times a week in summer. The most common residential version is 3x rule means water 3 days per week, morning watering, 30 minutes per zone, to achieve deep infrequent watering. So 3x rule is guideline for frequency and duration to achieve efficient watering without overwatering.
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