First, I have to apologize, because I don't know
very much about the Murray Darling Basin. I can
tell you a few things about salinity though.
Water dissolves small amounts of salt from the
rocks, sediment, and soil that it flows through.
"Salinity" is just how much dissolved salt is in
the water relative to how much water there is.
When some of the water evaporates, the dissolved
salts are left behind and the remaining water
becomes more "saline" or "salty," because it has
the same amount of salt but less water. If most or
all of the water evaporates then salt crystals
will start to form.
In dry places like the western USA or
Australia, water evaporates faster and leaves
behind more salt in the soil, lakes, and rivers.
This makes it very hard to irrigate crops, because
most plants can't live with very much salt in
I appologize if you knew all of this already,
but I hope it helped!
P.S. The Australian government has a great
website about the salinity problem in the
Murray-Darling Basin, if you have not seen it yet!
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