This browser tool provides access to
the Water Affairs water quality
sites, some monitored as early as the
1950s. Many are groundwater sites with
only one record, others are river sites
with thousands of samples. Links are
available to pre-packaged PNG or PDF graphs
and data files listing the more common
water quality constituents. Files for
displaying data in Google
Earth help you to see sites in
relation to one another and to assess
the strengths and weaknesses of the
sampling network.
Follow a Sites
link at the left to make a selection. "Top 333" is a good starting point,
showing the monitoring sites forming the core of the
National Chemical Monitoring Programme.
The "table" links provide the widest choice, while the "map" links
are useful if you are unfamiliar with the drainage regions and management areas.
To view only the hydrological stations labelled with
"station catalogue" codes, choose a rivers or dams link.
 Browser link problems
(February 2011) Some versions of Google Earth,
from version 5.2 onwards, have a bug that slows down or disables
the links within popup balloons. The result is that
when you click on
"graph" or "data" in the balloon at a monitoring
site, nothing happens, or the response is extremely
slow.
Google has located the source of the problem
and is working on a solution. The recommendation at the time of writing
was to
revert to version 5.1 from this link.
Time slider
These Google Earth KMZ
files are time-enabled: if a site is
not visible, it may have starting and
ending dates outside the date range
set in the time slider at the top
of the Google Earth display
(Google Earth version 4 and later).
Move the slider and its limit bars to
show sites active within a time
window. Click on the small clock face
(GE 4) or spanner (GE 5, 6) for
other options. Note that selecting and unselecting check boxes
in the GE table of contents sometimes resets the time range.
Definitive data source
These web pages are merely a static overview
of the WMS database and may lag
behind the actual database by a year or
more.
Zipped comma-delimited files provided
for use in programs such as Excel are
not live data:
the WMS
database is the definitive data
source.
Please address any
surface water quality data
requests to Marica Erasmus at Resource Quality Services
and
groundwater data queries to Georequests under Hydrological Services.
Please report problems with
these pages, or make suggestions for
improvements, to Michael Silberbauer.
Last update of this page
2011-12-14 11:04
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