What is a common cause of poor Distribution Uniformity?

• A. Even head spacing
• B. Proper use of nozzles
• C. Improper head spacing
• D. Consistent water pressure

Answer: (C)

The selection of improper head spacing as a common cause of poor Distribution Uniformity is based on the understanding of how irrigation systems function. Distribution Uniformity refers to the equal distribution of water across a landscape, ensuring that all areas receive the appropriate amount of moisture.

When the spacing between irrigation heads is not correctly calculated or executed, it can lead to uneven water application. If the heads are too far apart, some areas may receive little to no water, resulting in dry spots. Conversely, if the heads are too close together, overlapping can cause pooling and runoff, which also leads to inefficiencies. Proper head spacing ensures that the coverage area of each sprinkler overlaps adequately to maintain uniformity, exploiting the designed flow rates and pressure settings effectively.

In contrast, even head spacing, proper use of nozzles, and consistent water pressure typically contribute to improved Distribution Uniformity rather than detracting from it, thereby validating the correctness of the identified cause of the issue. Understanding the relationship between head spacing and Distribution Uniformity is essential for effective landscape irrigation management.