Certified Landscape Irrigation Auditor

What is the maximum allowable variation of pressure throughout an irrigation system?

1. 5%

2. 10%

3. 15%

4. 20%

The correct answer is: 10%

The maximum allowable variation of pressure throughout an irrigation system is commonly set at 10%. This standard is based on optimizing system performance and ensuring uniform distribution of water across the irrigation zones. Having a 10% variation allows for some flexibility in pressure without compromising the efficiency of the irrigation system. It helps in accommodating fluctuations that may arise from external factors like changes in demand or supply, and it ensures that the system can still deliver water effectively to all areas. A pressure variation greater than this limit can lead to uneven watering, which can affect plant health and increase water waste or runoff. Maintaining this balance is crucial, as it directly relates to the irrigation system's ability to properly hydrate plants and minimize the risk of over or under-watering, which can lead to stress on plants. Being mindful of pressure variations is a key consideration for landscape irrigation auditors to improve system design and performance.