CS 1173 Computation for Scientists and Engineers
Box plot gallery


Bacteria counts in Beaty Creek

box plots of bacteria The following graphs describe measurements of two types of bacteria for the Beaty Creek watershed in northeast Oklahoma before (pre) and after (post) implementation of a program of landowner education and best management practices to reduce contamination by animal waste. The "pre" measurement period goes from August 1999 to January 2001. The "post" measurement period goes from July 2001 to May 2005. The red line in each graph shows the geometric mean above which the bacterial counts are too high for beneficial use. That is, authorities can declare the water okay if the geometric mean of the data is less than the red value. The annotations on the graphs show the geometric mean of the actual data. You can find a more detailed description at .

Additional information can be found at:

Oklahoma: Beaty Creek BMPs Result in Significant Reduction of Bacteria and Phosphorus Loading
http://www.epa.gov/owow/nps/Success319/state/ok_beaty.htm