Which tool is NOT required for an irrigation system audit?

• A. Catch cans
• B. Pressure gauges
• C. Soil probe
• D. Shovel

Answer: (D)

In an irrigation system audit, specific tools are essential for assessing the efficiency and performance of the system. Catch cans are used to measure the distribution of water from the irrigation system, helping to identify issues like overly wet or dry spots. Pressure gauges are critical for measuring the pressure of the water in the system, which can affect the uniformity of water application. Soil probes are helpful for determining the moisture content in the soil at various depths, allowing the auditor to assess whether the irrigation system is meeting the plants' water needs.

The shovel, while a useful gardening tool, is not specifically required for an irrigation system audit. It may be used for other landscaping tasks, but in the context of evaluating irrigation efficiency, it does not play a direct role. Thus, it is correct to identify the shovel as the tool that is not required for conducting an irrigation system audit.