TABLE 3.

Monthly rainfall, drainage, and the percent loss of E. coli from undisturbed cow pat on the leachate collector^a

Month	Rainfall (mm)	Winter		Spring		Summer		Autumn
		Drainage (mm)	% E. coli loss from pat	Drainage (mm)	% E. coli loss from pat	Drainage (mm)	% E. coli loss from pat	Drainage (mm)	% E. coli loss from pat
July 2004	40.4	13.1	0.39
August 2004	136.8	31.3	0.43
September 2004	34.2	7.6	0.03
October 2004	25.4	3.1	0.13	0.1	0.002
November 2004	45	9.6	4.71	28.2	16.6
December 2004	131.6			84.3	57.8
January 2005	33.6			17.3	11.4
February 2005	18.6			32.5b	6.13	35.7b	26.5
March 2005	36.6					10.3	0.13
April 2005	52.4					30.1	5.95	32.4	0.25
May 2005	61					47.3	7.79	41.2	0.03
June 2005	19					7.0	1.74	5.7	0.005
July 2005	18.2							7.0	0.001
August 2005	13.8							6.0	0.92

^aThe total number of E. coli CFU in the pat was estimated from the geometric mean of the counts in the other four pats.

^bSite flooded (drainage exceeded rainfall).