What is the first step when conducting an overhead spray test in an irrigation system audit?

• A. Measure Water Volume
• B. Mark Spray Bodies with Flags
• C. Draw Diagram of Test Area
• D. Check Wind Speed

Answer: (C)

The first step when conducting an overhead spray test in an irrigation system audit is to draw a diagram of the test area. This initial action is crucial for several reasons. It allows the auditor to visually represent the layout of the irrigation system, including the location of spray heads, the zones they cover, and any obstacles that may impact water distribution. This diagram serves as a reference point throughout the audit process, helping to identify problem areas, compare performance across different zones, and ensure that all components of the system are accounted for.

Additionally, having a diagram provides a clear way to document findings and changes made during the audit. It helps create a structured approach to the evaluation, ensuring that every aspect of the system is considered. The other options, while important in the context of the audit, come after the diagram has been created. For example, measuring water volume, checking wind speed, and marking spray bodies can be effectively done with the visual context that the diagram provides.