Which of the following is NOT a type of irrigation controller?

• A. Standalone
• B. Weather-based
• C. Mechanical-only
• D. Soil moisture-based

Answer: (C)

Mechanical-only controllers are not widely recognized as a type of irrigation controller within the context of water-efficient landscaping practices. Instead, irrigation controllers are typically categorized into more sophisticated types that enhance efficiency and effectiveness in water usage.

Standalone controllers are basic systems that operate independently, allowing users to set schedules for irrigation without additional features. Weather-based controllers take into account environmental conditions, adjusting irrigation schedules based on real-time weather data to optimize water use. Soil moisture-based controllers measure the moisture content in the soil to determine when and how much to water, ensuring that plants receive adequate hydration without over-irrigation.

The focus on water efficiency in landscapes has led to the development of advanced controllers that utilize data to make informed decisions about irrigation, which is why mechanical-only controllers, lacking these capabilities, are not regarded as a standard type in this context.