Community Water Sampling at Lock Island

Thank you to the teams of Water Ambassadors that test the river water every month from Lock Island and send the results to the Water Watch Officer.



For the October reading the team found that the chemicals were out of date giving a false reading. Check out the test that caused the problem.


Results from 8th August Water Monitoring

Results from 8th August 2007

Temperature measures how hot and cold the water is. Thermometers measure temperature and have many scales based on the freezing and boiling points of water. We use Celsius to measure the temperature of the water.

Did you know?
Anders Celsius

The Celsius temperature scale is also referred to as the ‘centigrade’ scale. This scale is divided into 100 degrees. The Celsius scale was invented by Swedish Astronomer Anders Celsius (1701-1744). It has 100 degrees between the freezing point (0 degrees C) and boiling point (100 degrees C) of pure water at sea level air pressure.


Results from 28th June Water Monitoring

Water Monitoring Results 28th June

pH is a measure of the acidity or alkalinity of a solution. Any water with a pH less than seven is acidic and if it has a pH greater than seven then it is alkaline. The pH of 7.00 is neutral.
Did you know? pH was first introduced by a Danish chemist S. P. L. Sørensen at the Carlsberg Laboratory[3] in 1909. The name, pH, may come from a variety of places including: pondus hydrogenii (Latin), potentiel hydrogène (French), and potential of hydrogen (English).


Results from 6th June Water Monitoring

Results from 6th June Water Monitoring

There are five tests we do every month: pH, temperature, conductivity, turbidity and soluble phosphates.


Results from 5th May Water Monitoring

Water Monitoring Results 5th May

Our school is part of the Community Stream Sampling (CSS) project to monitor salinity at Lock Island once a month. There are many other teams doing the same thing across the Murray Darling Basin. We have a better understanding of how salinity can enter the water ways. Rachael from Mallee Catchment Authority showed us how to use all of the equipment.


Water monitoring at the lock

On Wednesday 18th April the River Issues Student Action Team  walked down to the Lock 11 to learn how to take different tests of the river. When we arrived we met Rachael, the  Waterwatch Officer and she explained our responsibility which was to test the water once a month.  Then she asked us what some of the problems are with the river? We found out that the problems are salinity, turbidity, suspended solids and pH. The temperature is also important. After that Rachael showed us the equipment we use to do all the different tests on the water and how we use them to tell us what the water is like. Soon we got into groups and had a go ourselves. While we were testing our samples we had to fill in a data sheet to keep record of our results. When we all finished we had to empty our samples back into the river. Just before we left we had to answer questions correctly to get a prize. We all had fun and a great time.


Lock Island


Enviro team

On Wednesday 18th  April, the Mildura West Primary School’s River Issues Student Action Team went down to Lock Island to monitor the water. There we tested for pH which is a scale 1-14, up to 7 is acidic meaning too much acid and it will make froth and pollute the river, higher than 7 is alkaline which makes everything overgrow including blue green algae! 7 is neutral the ideal amount. The Murray is usually alkaline (7-9).

We also tested the temperature. A good temperature is 15 degrees Celsius.

Another thing we tested for was salinity (a measure of salt levels). Salinity is measured in µS (microSiemens). µS = EC (electrical conductivity) the lower amount of salt the better.

We also tested turbidity which is how clear the water is, it is measured in NTU (Nephelometric Turbidity Units), the lower NTU level the better.

Another test we did was a test for ‘Soluble Phosphate’. It measures the nutrient Phosphorous in a form that is available for plants to take up and use. It is measured in mg/LP (phosphorus)

We will be providing a link to the results soon. So come back and visit again.