Brackish water is a mixture of freshwater and seawater, below approximately 33 ppt.
Brackish water(aka brack water) is water occurring in a natural environment that has more salinity than freshwater but not as much as seawater. It may result from mixing seawater (salt water) and freshwater together, as in estuaries, or it may occur in brackish fossil aquifers. The word comes from the Middle Dutch root brak, which means slightly salty.
What is Salinity ? Salinity is the measure of the number of grams of salts per kilogram of seawater, which is expressed in parts per thousand. Parts per thousand can be defined as how many parts, or grams, of salt there are per thousand parts, or kilogram (1,000 g), of seawater
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