Appendix 12. Calculated values for sunlight exposure time (min) at specified solar UV-A intensities as a function of survival of coliform bacteria.

Appendix 12. Calculated values for sunlight exposure time (min) at specified solar UV-A intensities as a function of survival of coliform bacteria.
Bacterial Survival (%)	Solar UV-A intensity (W/m²)

	2.0	4.0	6.0	8.0	10.0	12.0	14.0	16.0	18.0	20.0	22.0	24.0

95	5.7	2.9	1.9	1.4	1.1	1.0	0.8	0.7	0.6	0.6	0.5	0.5
90	11	5.7	3.8	2.9	2.3	1.9	1.6	1.4	1.3	1.1	1.0	1.0
85	18	8.9	5.9	4.4	3.5	3.0	2.5	2.2	2.0	1.8	1.6	1.5
80	24	12	8.0	6.0	4.8	4.0	3.4	2.0	2.7	2.4	2.2	2.0
75	31	16	10	7.8	6.2	5.2	4.4	3.9	3.5	3.1	2.8	2.6
70	38	19	13	9.6	7.7	6.4	5.5	4.8	4.3	3.8	3.5	3.2
65	46	23	15	12	9.3	7.8	6.6	5.8	5.2	4.6	4.2	3.9
60	55	27	18	14	11	9.2	7.7	6.9	6.1	5.5	5.0	4.6
55	64	32	22	16	13	11	9.2	8.1	7.2	6.4	5.9	5.4
50	75	37	25	19	15	12	11	9.3	8.3	7.5	6.8	6.2
45	86	43	29	21	17	24	12	11	9.5	8.6	7.8	7.2
40	99	49	33	25	20	16	14	12	11	9.9	9.0	8.2
35	113	57	38	28	23	19	16	14	13	11	10	9.4
30	130	65	43	32	26	22	19	16	14	13	12	11
25	149	75	50	37	30	25	21	19	17	15	14	12
20	173	87	58	43	35	29	25	22	19	17	16	14
15	204	105	68	51	41	34	29	26	23	20	18	17
10	248	124	82	62	50	41	35	31	28	25	22	21
9	259	129	86	65	52	43	37	32	29	26	24	22
8	272	136	90	68	54	45	39	34	30	27	25	23
7	286	143	95	71	57	48	41	36	32	29	26	24
6	302	151	101	76	60	50	43	38	34	30	27	25
5	322	161	107	80	64	54	46	40	36	32	29	27
4	346	173	115	86	69	58	49	43	38	35	31	29
3	377	188	126	94	75	63	54	47	42	38	34	31
2	421	210	140	105	84	70	60	53	47	42	38	35
1	495	248	165	124	99	82	71	62	55	50	45	41
0.5	569	285	190	142	114	95	81	71	63	57	52	47
0.1	742	371	248	186	148	124	106	93	82	74	68	62
0.01	990	495	330	247	198	165	141	124	110	99	90	82
Note: Data were obtained using equation 3 and mean experimental values.