WebSMURF: Observation Results

Observed data: Ammonia for river section 'Coleshill Severn Trent Water Outfall to Lea Marston'

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	1.17	2.10	5.04	33	7.70	2.59	0.61
10/1990	0.85	1.80	4.14	47	8.10	2.21	0.50
10/1991	0.59	1.75	2.56	45	3.20	1.57	0.33
10/1992	0.43	1.28	2.71	45	4.67	1.49	0.14
10/1993	0.67	1.43	3.71	42	7.12	1.88	0.51
10/1994	0.82	1.45	3.42	43	5.30	1.96	0.50
10/1995	1.12	2.27	4.25	16	5.46	2.49	1.07
10/1996	0.96	2.02	3.77	9	4.69	2.30	0.61
10/1997	0.36	1.01	2.75	11	3.12	1.40	0.27
10/1998	0.16	0.56	1.24	41	2.54	0.68	0.09
10/1999	0.13	0.51	2.20	13	2.57	0.84	0.11
10/2000	0.14	0.36	0.87	12	1.34	0.48	0.14
10/2001	0.08	0.14	0.24	12	0.26	0.15	0.07
10/2002	0.15	0.18	1.01	3	1.22	0.51	0.14

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