Chlorophyll a (μg/L)
| ■ |
0.0 - 0.5 |
| ■ |
0.5 - 1.0 |
| ■ |
1.0 - 2.0 |
| ■ |
2.0 - 5.0 |
| ■ |
5.0 - 10.0 |
| ■ |
10.0+ |
Chlorophyll a
| ■ |
<0.5 × WQ objective |
| ■ |
0.5-1.0 × WQ objective |
| ■ |
1.0-1.5 × WQ objective |
| ■ |
≥1.5 × WQ objective |
| |
|
| |
|
Secchi (m)
| ■ |
10+ |
| ■ |
4 - 10 |
| ■ |
3 - 4 |
| ■ |
2 - 3 |
| ■ |
1 - 2 |
| ■ |
0 - 1 |
Secchi
| ■ |
<0.5 × WQ objective |
| ■ |
0.5-1.0 × WQ objective |
| ■ |
1.0-1.5 × WQ objective |
| ■ |
≥1.5 × WQ objective |
| |
|
| |
|
Total Nitrogen (mg/L)
| ■ |
0.00 - 0.07 |
| ■ |
0.07 - 0.14 |
| ■ |
0.14 - 0.30 |
| ■ |
0.30 - 0.60 |
| ■ |
0.60 - 1.00 |
| ■ |
1.00+ |
Total Nitrogen
| ■ |
<0.5 × WQ objective |
| ■ |
0.5-1.0 × WQ objective |
| ■ |
1.0-1.5 × WQ objective |
| ■ |
≥1.5 × WQ objective |
| |
|
| |
|
|
| EHI (80%) |
BHR (20%) |
Combined Score |
| 0.56 |
0.50 |
0.55 |
| Previous EHI Scores |
| 2003 |
2004 |
2005 |
2006 |
2007 |
2008 |
| 0.93 |
0.94 |
0.86 |
0.81 |
0.58 |
0.74 |
ECOSYSTEM HEALTH INDEX (EHI)
The EHI is a measure of the proportion of a reporting zone that complied with the water quality
objectives for key indicators monitored as part of the Ecosystem Health Monitoring Program. The water
quality objectives are defined in the South East Queensland Regional Water Quality Management Strategy
(2001).
- EHI 1 = 100% of area complies with the environmental objectives.
- EHI 0 = 0% of the area complies with the environmental objectives.
BIOLOGICAL HEALTH RATING (BHR)
The BHR forms 20% of the the Report Card Grade. The values in this sheets are calculated using the
original method used since 2002-03 and is presented for comparison.
| Bay Cutoffs |
RC Grade |
| <0.5 |
F |
| >0.5
<0.7
|
D |
| >0.7
<0.8
|
C |
| >0.8
<0.9
|
B |
| >0.9 |
A |
|
