This is the only irrigation controller in the world where the water usage rate is proportional to the onsite evaporation rate. If it has not rai...

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This is the only irrigation controller in the world where the water usage rate is proportional to the onsite evaporation rate. If it has not rai...
This is the only irrigation controller in the world where the water usage rate is proportional to the onsite evaporation rate. If it has not rained since the previous irrigation event, then the water discharged by each dripper (or sprinkler) during the irrigation event is proportional to the volume of water that has evaporated from the surface of the terracotta pot since the previous irrigation event.
If it has rained since the previous irrigation event, then the volume of water discharged by each dripper (or sprinkler) during the irrigation event is proportional to the volume of water that has evaporated from the surface of the terracotta pot minus the rain that has entered the terracotta pot since the previous irrigation event.
The Unpowered Terracotta Irrigation Controller should be located in your garden so that the weather conditions at the controller are the same as the weather conditions experienced by your plants. Most irrigation controllers use weather data from the Bureau of Meteorology (evapotranspiration, for example) rather than the onsite weather conditions, and hence the Unpowered Terracotta Irrigation Controller saves more water.
This is the only irrigation controller in the world that is unpowered, and so it can operate for months on end in remote locations without having to worry about power outages or battery failure.
I have attached the User Manual for the Unpowered Terracotta Irrigation Controller.
The Unpowered Terracotta Irrigation Controller is available online from the Measured Irrigation website for only AU$69.

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