Table 1: Trigger Values for New Zealand rivers

Data from the National Rivers Water Quality Network (NRWQN). Percentiles compiled 18/5/2000 by R. J. Davies-Colley
Baseline or Pseudo-baseline Sites, JANUARY 1989 TO DECEMBER 1998 (10 YEARS)
	TP	DRP	TN	NO3	NH4	DO%	pH	Clar	Turb	Temp	Temp
	ppb P	ppb P	ppb N	ppb N	ppb N	%	units	m	FTU	Deg C	Feb. only
											Deg C
Upland sites, elevation > 150 m ( = 28 SITES)
NO. OBSERVATIONS	3388	3394	3032	3396	3047	3365	3360	3382	3399	3400	278
80th PERCENTILE	24	6.0	230	108	9	103.7	8.01		5.00	14.4	18.1
20th PERCENTILE						99.1	7.42	0.65

Upland sites, elevation > 150 m, glacial and lake-fed sites removed ( = 18 SITES)
NO. OBSERVATIONS	2194	2199	1960	2200	1973	2176	2179	2188	2202	2202	179
80th PERCENTILE	26	9.0	295	167	10	102.8	8.00		4.10	13.9	17.9
20th PERCENTILE						98.9	7.3	0.8

SE Australia (upland)	20	15	250	15	13	110	7.5		2 to 25
						90	6.5
Lowland sites, elevation < 150 m ( = 4 SITES)
NO. OBSERVATIONS	473	473	422	474	426	474	470	473	473	474	38
80th PERCENTILE	28	9.0	555	391	15	103.1	7.77		4.89	16.9	20.3
20th PERCENTILE						97.4	7.2	0.75
Lowland sites, elevation < 150 m, Haast River (alpine headwaters) removed ( = 3 SITES)
NO. OBSERVATIONS	353	353	315	354	318	354	351	353	353	354	30
80th PERCENTILE	33	10.0	614	444	21	105	7.87		5.58	16.1	21.5
20th PERCENTILE						98	7.15	0.56
SE Australia (lowland)	50	20	500	40	20	110	8		6 to 50
						85	6.5