DO Sag Curve is a graph showing changes in water, such as streams DO Canal, River, etc, which is a pointer to show water quality based on distance and duration in a water source. The curve shows the level of dissolved oxygen, based on the length of the River, which will be reduced. When the drain was broken down, and the River will increase again when the air is filled. From photosynthesis or to insert the water of oxygen from the air can describe a graph as follows.
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