LRAA returns the Locational Running Annual Averages (LRAA) for a variable. LRAA calculates the average of the current quarter and the 3 previous quarters and averages those averages. Calculates on the last day of each quarter.
SYNTAX:
LRAA(Cx)
where :
Cx is a conditional variable x
NOTES:
The Locational Running Annual Averages (LRAA) and Operational Evaluation Level (OEL) are required as part of the Stage 2 Disinfection Byproducts rule (DBPR) for Total Trihalomethanes (TTHMs) and Haloacetic Acids (HAA5s).
Function will calculate if one (1) value is found in any quarter.
SEE ALSO:
OEL
EXAMPLES
Calculating 12/31/2024
LRAA(50001) - Calculates the average for Q4 2024 (Oct 1 thru Dec 31 2024), Q3 2024 (July 1 thru Sep 30 2024), Q2 2024 (April 1 thru June 30 2024), Q1 2024 (Jan 1 thru March 31 2024) sums the values and divides by 4 (or number of quarters with at least one value).
