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Rain Master Irrigation Systems
RME EAGLE User Manual
Chapter 8 ET Programming
Page 97
In order to take advantage of the ET water savings capability built within your RME EAGLE
controller you must perform the following steps:
Table 7 - ET Data Entry
Operation Description
Reference
Step 1 - Obtain the
Historical ET Data.
Obtaining and entering the twelve monthly
ET values
Section 8.2
Step 2 – Generate a
Reference Program
Enter the start times, stations, and water
days.
Section 8.3
Step 3 - Establish the ET
Reference Value
Enter the reference ET data value
Section 8.4
Step 4 - Enable ET
Operation Mode
Set Programs to ET mode or conventional
program mode
Section 8.5
Step 5 - Selecting the ET
Data Source
Select historical, weather station, manually
entered, or the Internet
Section 8.6
8.2 OBTAINING THE HISTORICAL ET DATA
Historical Evapotranspiration is accumulated ET data (typically accumulated 5 years or longer)
compiled on a monthly basis for a specific location. This data is often times collected and
maintained by various state and local agencies. In order to utilize the ET Scheduling features of the
RME EAGLE, historical ET must be entered into the controller. Unfortunately, no national
standard exists as to how this data is measured, compiled, or whether it is even collected at all.
Rain Master Irrigation Systems has however, assimilated Evapotranspiration data for the entire
United States. The weather parameters used to derive historic ET has been obtained from nationally
recognized weather stations and observation systems. The historic ET data was averaged over a
thirty (30) year period. The data is organized by United States postal zip codes and is available at
the Rain Master Irrigation Systems Website
www.rainmaster.com
.
In order to use historical ET data as your source you must enter the historical data into the RME
EAGLE for each month of the year based upon your climate. If you cannot find your city in the list,
pick a city or location that is in the list which best represents your climate (This may turn out to be a
city that is in another state).
Once you have obtained your local specific data, refer to
section 7.4 ENTERING HISTORICAL ET
MONTHLY VALUES
for the procedures necessary to enter the data into your RME EAGLE
controller.
Utilization of historical data allows water savings to be achieved in an immediate fashion. Savings
are realized because your RME EAGLE has been designed to re-compute station runtimes based
upon climactic trends as defined by monthly historical ET information. The controller performs
daily station runtime computations based upon the weather conditions, in turn, water savings are
realized since the controller automatically adjusts based upon need.
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