WebSMURF: Observation Results

Observed data: Ammonia for river section 'Pack Horse Bridge, Perry Barr to confluence with River Rea'

Graph of Ammonia - data tabulated below

The graph shows how ammonia 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	0.77	2.80	4.69	10	5.50	2.56	0.20
10/1990	0.42	2.30	5.29	12	6.80	2.63	0.31
10/1991	0.99	2.10	5.30	11	7.30	2.93	0.35
10/1992	0.52	1.36	4.53	11	5.33	2.13	0.39
10/1993	0.28	1.30	3.42	11	5.13	1.89	0.07
10/1994	0.06	0.62	2.39	22	3.86	1.08	0.03
10/1995	0.20	0.50	3.93	12	5.91	1.33	0.08
10/1996	0.09	0.36	2.10	13	2.76	0.77	0.06
10/1997	0.07	0.42	0.60	10	0.83	0.39	0.03
10/1998	0.12	0.31	1.16	12	1.42	0.47	0.09
10/1999	0.17	0.49	1.41	12	4.19	0.87	0.09
10/2000	0.09	0.28	0.84	12	7.19	0.93	0.04
10/2001	0.06	0.32	0.42	12	0.56	0.29	0.05
10/2002	0.28	0.40	0.49	3	0.51	0.39	0.25

The table shows how ammonia data for this river section has changed over time.