This formula pertains to measuring discharge at a cross-section of a stream. Ple

Question

This formula pertains to measuring discharge at a cross-section of a stream. Please explain the (bn+1 - bn-1) part? I understand what "b" is but is 1 being added/subtracted from b or from n?

12 Q discharge for subsection n, d -depth at subsection n, b, - distance along the tape measure from the initial point on the left bank to point n, o, = mean velocity of subsection n. If any section has >5% of the total discharge (calculated in next step), subdivide that section into smaller incremental widths and take additional measurements. Calculate the total discharge (Q) for the cross section by adding all of the Q,'s to get total stream discharge (Q) Choose a water velocity measurement method that best fits the cost limitations and accuracy requirements.

Explanation / Answer

This formula pertains to measuring discharge at a cross-section of a stream. Ple

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