Download RKS User Manual - Cycle Manager Login

Options for Getting ET Data
Table B.14. Explanation
Date
Explanation
7/1
The ET balance is set to ETc = ET – Rain. As the ET balance is >= Min ET the program
will run and use the entire ET balance.
7/2
The ETc = 0.19, which is added to the ET balance. As the ET balance is less than the Min
ET the program will not run.
7/3
The ET balance will now be the sum of ETc for 7/2 and 7/3; i.e. 0.51”. As this is above
the Max ET the program will only apply 0.35” and the remaining 0.16” will be left in the
ET balance.
7/4
Just a normal day. ET – Rain from the past day is added to the ET balance and it irrigates.
7/5
A lot of rain. ETc becomes negative and so does the ET balance. No irrigation.
7/6
Another day with a lot of rain. No limit in the ET balance as there is no soil holding
7/7+8
Positive ETc and the ET balance increases, but still no irrigation.
Example B.9. Max. hourly rain
The program is set to run one time every day; i.e. it will if ET balance is greater than Min ET. The example
starts with 0.20” ET, no rain and an empty ET balance.
The example shows the effect of max hourly rain. If it rains more than Max hourly rain within an hour only
the Max hourly rain is used.
B.2. Options for Getting ET Data
Your controller will accept ET data from a number of sources, and the mechanisms using the ET data to
calculate irrigation aspects are identical, regardless of input method.
86