When adjusting spacing for spray heads, the acceptable tolerance is:

The acceptable tolerance for adjusting spacing for spray heads being set at plus or minus 10% is based on ensuring optimal irrigation coverage while preventing issues like over-watering or under-watering. This tolerance level reflects a balance between ensuring sufficient overlap of spray patterns to prevent dry spots in the irrigated area and managing water usage efficiently.

When spacing is adjusted within this tolerance, it allows for some flexibility in installation and maintenance without significantly impacting performance or water efficiency. Such a guideline is essential for maintaining the effectiveness of the irrigation system, as distances that are too wide can lead to areas of insufficient coverage, while spacing that is too close may lead to runoff or excessive water application in certain areas. Therefore, a 10% tolerance is a practical standard that helps maintain effective watering strategies and supports compliance with irrigation design practices.