What is the main benefit of implementing a weather-based irrigation controller in landscape irrigation?

• A. It schedules watering at the same time every day.
• B. It reduces irrigation when local weather data indicates less need, improving efficiency.
• C. It requires no sensors or data inputs.
• D. It increases irrigation precision by irrigating every zone equally.

Answer: (B)

A weather-based irrigation controller is designed to match watering to real conditions, using local weather data to tell the system how much water the landscape needs. The key benefit is that it scales back irrigation when the forecast or current conditions indicate less water is needed—cooler temperatures, higher humidity, or recent rainfall reduce evapotranspiration, so the controller reduces run times and frequencies. This targeted adjustment saves water and improves efficiency without sacrificing plant health, because irrigation is aligned with actual demand rather than a fixed schedule.

Watering at the same time every day ignores weather and soil moisture, so it can waste water during rain or cool periods. It does rely on inputs like weather data or sensors to make decisions, so saying it requires no sensors or data inputs isn’t accurate. And irrigation isn’t about equalizing every zone; a weather-based controller adjusts per-zone needs based on conditions, not just sprinkling the same amount everywhere.