What is the role of a rain sensor in irrigation control?

What is the role of a rain sensor in irrigation control?

• A. To automatically stop irrigation when rainfall meets a predefined threshold, conserving water.
• B. To initiate irrigation when rainfall occurs.
• C. To monitor soil pH levels.
• D. To measure wind speed.

Answer: (A)

Rain sensors are used to automatically adjust irrigation based on rainfall, helping to conserve water. They detect rain and pause or override the irrigation controller when a predefined amount has fallen, so watering isn’t wasted after or during rain. This prevents overwatering and runoff and can resume watering once the soil dries to a set threshold. The other options don’t fit because a rain sensor’s job isn’t to start irrigation during rain, to monitor soil pH, or to measure wind speed.

Rain sensors are used to automatically adjust irrigation based on rainfall, helping to conserve water. They detect rain and pause or override the irrigation controller when a predefined amount has fallen, so watering isn’t wasted after or during rain. This prevents overwatering and runoff and can resume watering once the soil dries to a set threshold. The other options don’t fit because a rain sensor’s job isn’t to start irrigation during rain, to monitor soil pH, or to measure wind speed.