Dissolved oxygen is a measure of the amount of gaseous oxygen contained in water. Healthy waters that can support life must contain dissolved oxygen (DO). Dissolved Oxygen enters water by: direct absorption from the atmosphere. rapid movement from winds, waves, currents or mechanical aeration.

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What is Dissolved Oxygen (DO)?Dissolved Oxygen (DO) is the amount of oxygen dissolved in a unit of water. Oxygen gets into water by: diffusing within the surrounding air, aeration (turbulent movement), and as a waste product from plants through photosynthesis.