What is yellow curve represents in the following figure?

Related Questions

• Which of the following represents the oxygen sag curve in the following figure?
• Which of the following is represented b the green curve in the above figure?
• Which of the following is not correct regarding conservancy system?
• Which of the following is correct regarding water carriage system?
• Which of the following is an advantage of a separate water carriage system?
• Which of the following is a disadvantage of a separate water carriage system?
• Which of the following is an advantage of the combined water carriage system?
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