WebSMURF: Observation Results

Observed data: Total Organic Nitrogen (TON) for river section 'Pack Horse Bridge, Perry Barr to confluence with River Rea'

Graph of Total Organic Nitrogen (TON) - data tabulated below

The graph shows how total organic nitrogen (ton) data for this river section has changed over time.

Date of observation	centile10 (mgN/l)	centile50 (mgN/l)	centile90 (mgN/l)	count	max (mgN/l)	mean (mgN/l)	min (mgN/l)
10/1989	6.66	10.50	13.11	10	13.20	10.34	6.30
10/1990	7.38	10.55	12.99	12	13.30	10.35	5.80
10/1991	9.30	10.40	11.50	11	12.30	10.55	9.30
10/1992	5.70	10.30	13.20	11	13.90	9.86	5.00
10/1993	8.17	9.48	12.00	11	13.10	10.01	6.73
10/1994	5.51	9.29	11.55	22	13.40	8.89	3.58
10/1995	8.99	10.95	13.10	12	14.20	11.00	8.14
10/1996	6.71	11.30	12.16	13	12.50	10.21	5.46
10/1997	8.22	11.10	13.23	10	13.50	11.22	8.01
10/1998	5.75	8.16	11.79	12	11.90	8.77	4.91
10/1999	6.42	8.51	11.44	12	11.50	8.58	4.68
10/2000	6.07	8.38	9.15	12	9.51	7.96	5.61
10/2001	3.96	8.49	9.63	12	9.95	7.60	2.84
10/2002	4.24	5.86	7.20	3	7.54	5.74	3.83

The table shows how total organic nitrogen (ton) data for this river section has changed over time.