Which measure calculates irrigation efficiency?

The measure that calculates irrigation efficiency is the ratio of water applied to water needed. This metric is crucial because it directly assesses how effectively an irrigation system delivers the necessary water to meet the plants' requirements without excess waste.

Irrigation efficiency focuses on optimizing water use so that plants receive just the right amount of moisture for their growth without over-irrigating, which can lead to runoff and water loss. Understanding this ratio helps landscape architects design more sustainable irrigation systems, conserve water, and ensure the health of the landscape.

By comparing the amount of water actually applied to the amount of water that is necessary for the plants based on factors such as evapotranspiration rates and plant needs, professionals can evaluate and improve their irrigation practices. This assessment is vital not only for resource management but also for complying with water conservation regulations, which are especially pertinent in California's climate.