Definitions for "Brackish water"
Saline water that has a lower salinity than seawater.
Water having salinity values ranging from approximately 500 to 5,000 parts per million (milligrams per liter).
Water with an average tidal cycle chloride concentration of greater than 250 mg/l but less than 18,700 mg/l (corresponding to greater than 0.45 but less than 34 parts per thousand).