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Aims of the Water Quality Calculator:
- determine the resultant water quality from mixing different water sources
- highlight the potential impact of water quality on yields of commercial
irrigated crops
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This simple web tool can be used to calculate the salinity (EC), Sodium Adsorption Ratio (SAR)
and pH when water sources are mixed together to provide irrigation water. The calculated figures
are then compared with the Australian and New Zealand Guidelines for Fresh and Marine Water Quality
and reference information contained in the Cotton CRC WaterPak publication.
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The Relationship between SAR and EC
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The above shows the relationship between SAR and EC of irrigation water for prediction of soil structural
stability (adapted from DNR 1997: note that 1 dS/m = 1000 µS/cm).
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References
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This tool uses reference material from the following sources and further information can also be
found in these areas:
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WATERpak
provides technical information and practical advice to help irrigators improve
irrigation practices, minimise environmental impacts and increase farm profits
from irrigated cotton crops. To access this publication and other Cotton CRC information
resources,
click here.
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Australian and New Zealand Guidelines for Fresh and Marine Water Quality provide
an authoritative guide for setting water quality objectives required to sustain
current, or likely future, environmental values [uses] for natural and
semi-natural water resources in Australia and New Zealand. These guidelines can
be accessed by clicking here.
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NSW Department of Primary Industries
website.
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Queensland Department of Natural Resources
website covers a range of issues that can help irrigators monitor their
water quality.
Fact sheets are available on
taking water samples and
interpreting analysis results.
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Note: This tool does NOT aim to predict the impact on soil characteristics from irrigation as other
tools already exist for this purpose.
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