AMX RADIA LIGHTING CONTROL ENCLOSURE WORKSHEET GUIDE Specifications download pdf (Page 3)

Rain Bird

ET Manager Series - Installation and Operation Manual

Table of Contents

1. Introduction

Congratulations on purchasing the Rain Bird ET

Manager! Your ET Manager (ETMi) works with almost

all sprinkler controllers to automatically control water-

ing based on current weather conditions bringing

smart control to your sprinkler system. Weather condi-

tions affect how much water your landscape needs.

With your ET Manager landscape watering will be fully

automatic and more accurate.

Principles of Weather Based

Water Management

There are four key principles to the operation of the ET

Manager.

Principle #1:

The soil is a reservoir: The purpose of watering is to

replenish the soil reservoir, which makes water avail-

able for plants (see Figure 1). This reservoir has a limit-

ed capacity based on soil type and root depth.

Principle #2:

Weather Affects Landscapes: Landscapes need water

at changing rates based on weather conditions. Water

leaves plants and soil through evaporation. Because

weather has a direct affect on evaporation, changing

weather conditions have an effect on how often land-

scape watering is needed.

Principle #3:

Evaporation can be measured based on weather

conditions: Landscape, golf, and agricultural water

managers have been using weather stations to measure

the loss of soil moisture caused by evaporation for over

20 years.

Evapotranspiration, or ET, is a measurement of water

that evaporates into the air from the soil and the

amount of water that is used (transpired) by a plant. ET

is used to determine how much water must be returned

to the landscape, either by rainfall or by using a sprin-

kler system. ET is typically expressed in hundredths of

inches of water per day. ET losses are calculated using

meteorological data measured with a weather station.

Weather parameters used to calculate ET include: solar

energy, air temperature, wind speed, humidity, and

rainfall.

Figure 2 shows that ET is highest in the hot summer

months, the time when your landscape needs the most

water. Landscape, golf, and agricultural water managers

have been using weather stations to measure the loss of

soil moisture caused by evaporation for over 20 years.

Figure 2. Example of Evapotranspiration for One Year

Principle #4

Technology can provide automated watering: The

ET Manager uses current weather conditions to auto-

matically control watering.

Soil Reservoir

Figure 1. Soil Reservoir

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