A stage-discharge rating curve for a river cross-section is developed by:
Choose the correct answer
Using only historical flood records
Measuring discharge by current meter at various stages over time, plotting Q vs stage (H), and fitting a power law Q = a(H - H0)^b
Aerial photography only
Manning equation for average cross-section only
Correct Answer
B. Measuring discharge by current meter at various stages over time, plotting Q vs stage (H), and fitting a power law Q = a(H - H0)^b
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Rating curve: Q = a(H - H0)^b, where H0 = zero-flow gauge height, a and b are constants. Developed from many paired (H, Q) measurements at different flows over several years. Used to convert continuous stage records to discharge (used in stream flow accounting). Curve shifts if cross-section changes (floods erode/deposit bed).
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