Universal Devices ISY-994i Series, User Manual

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17.2 Using the HAM Weather Irrigation Module
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17.2.1 The Basic Idea of this Module
For more in depth discussion of Evapotranspiration, please check out the section: 17.1
Evaporation and Irrigation
This module is designed to calculate the amount of water that is lost from the soil and
plants and replace it with a close approximation of what was lost. Today in a world of
"Green is good" every consumable resource such as water can be better conserved with
such a tool.
The module takes the local WeatherBug data, the user settings, and calculates each day the
average water that has been lost. The user then can have programs that respond to these
calculations and apply the appropriate amount of water to replace that loss. When those
programs complete they trigger a command that lets the module know that the water has
been applied and can be subtracted from the module's tally. Each day this is done
completing the cycle of tracking the data and applying the water. During cooler times of the
year the watering days frequency will slow down, and during the warmer parts of the year
the watering frequency will ramp up to daily.
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