Certified Landscape Irrigation Auditor

What is the average distribution uniformity across irrigation systems?

1. 0 - 0.5

2. 0.55 - 0.75

3. 0.75 - 0.85

4. 0.85 - 1.0

The correct answer is: 0.55 - 0.75

The average distribution uniformity (DU) across irrigation systems is typically measured in terms of how evenly water is distributed across a given area. A distribution uniformity in the range of 0.55 to 0.75 indicates that the irrigation system effectively delivers water to most of the area while acknowledging that some variations or inefficiencies may occur. This level of DU suggests that while there may be inconsistencies, the system is generally functioning well, achieving a reasonable degree of water distribution. Systems with this level of performance can typically provide adequate coverage for most landscapes, ensuring that both high and low areas receive sufficient irrigation to support plant health without excessive waste. Maintaining this average is crucial for optimizing water use, reducing runoff, and promoting sustainable irrigation practices. Higher levels of DU (such as 0.75 to 0.85 or even 0.85 to 1.0) would indicate an increasingly efficient irrigation system with minimal variability in water distribution, but the range of 0.55 to 0.75 represents a realistic expectation for many conventional irrigation systems, especially those that may not have additional enhancements or optimizations in place.