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What does the term "thread of a stream" refer to?

  1. The entire length of the river

  2. The deepest part of the river

  3. The measured center of a stream

  4. The area most frequented by fish

The correct answer is: The measured center of a stream

The term "thread of a stream" specifically refers to the measured center of the waterway, which is typically the line of the deepest part of the channel. This concept is significant in surveying and hydrology, as it represents the line that would generally follow the natural flow of the water, thus providing information crucial for mapping, property lines, and floodplain studies. Understanding this definition helps clarify why "thread of a stream" is not defined by the entire length of the river, the area frequented by fish, or simply the deepest spot, but rather it encapsulates the flow's central line, which is essential for various legal and environmental applications in land surveying and water resource management.