Archived water quality assessments
Ecological health
We collect two samples of macroinvertebrates, one from riffle
(or flowing water) habitat and one from edge (still water) habitat.
The diversity of the macroinvertebrate community is used to describe
ecological health as being in good,
moderate or poor
condition.
Ecological health assessment for November 2005
| Habitat |
Ecological health
|
| Edge |
Good
|
| Riffle |
Good
|
These ratings are consistent with previous results.
Ecological health assessment for May 2005
| Habitat |
Ecological health
|
| Edge |
Good
|
| Riffle |
Good
|
Water chemistry
The indicators that are measured in the Tod River at Koppio are
nutrients (nitrogen and phosphorus), turbidity and salinity.
The concentrations of these indicators are used to classify the
water chemistry as being in good,
moderate or poor
condition, according to the needs of aquatic ecosystem protection.
Water chemistry classification for October 2005 to March 2006
|
Indicator
|
Classification
|
|
|
Good
|
|
|
Poor
|
|
|
Good
|
|
|
Good
|
|
|
Good
|
The levels of total nitrogen during this sampling period were
higher than normal. Previously total nitrogen has been classified
as moderate. Nitrogen can be elevated as a result of fertilisers
or animal wastes being washed off farms during storms. The other
classifications are consistent with previous results.
Water chemistry classification for April to September 2005
|
Indicator
|
Classification
|
|
|
Good
|
|
|
Good
|
|
|
Good
|
|
|
Good
|
|
|
Good
|
This page was last modified 13-09-2007
|
