Weather parameters used to calculate ET include: solar radiation, temperature, wind speed and humidity. Solar radiation is the primary energy source influencing ET. Air temperature to a lesser extent also provides this energy. In dry conditions ET will be higher compared to a humid environment. Wind increases ET rates.

Weather Reach uses the ASCE Standardized Evapotranspiration Rate equation, developed by the Environmental and Water Resources Institute of the American Society of Civil Engineers. The Irrigation Association formally recognizes this equation as the industry standard.

In the early 80’s weather stations began to be used on golf courses, theme parks, and other large sites to control watering. Weather Reach makes this proven science affordable for commercial and residential applications.

Weather Reach utilizes ET and rain to manage irrigation and maintain optimum soil moisture.

ASCE - Standardized Reference Evapotranspiration Equation