Dickens formula constant for high-flood estimation In Dickens’ regional flood formula Q = C * A^(3/4), an average value of the constant C commonly adopted for high-flood estimates is approximately:

Difficulty: Easy

Correct Answer: 11.5

Explanation:


Introduction / Context:
Empirical regional flood formulas like Dickens’ are used for preliminary peak-discharge estimation where gauge data are sparse. The coefficient C captures regional rainfall and catchment response.



Given Data / Assumptions:

  • Dickens’ formula: Q = C * A^(3/4), with Q in m^3/s and A in km^2.
  • “Average” value of C for high-flood estimation in many Indian regions.


Concept / Approach:
While C varies geographically (mountainous vs coastal vs inland basins), guidance texts often suggest a representative average near 11 to 12 for high floods where local calibration is unavailable.



Step-by-Step Solution:

Recognize that among the given choices, 11.5 best represents the widely cited average for high floods.


Verification / Alternative check:
Regional hydrology manuals list ranges (e.g., 6–30) with typical values around 11 for many basins; selection depends on local context.



Why Other Options Are Wrong:

  • 6.5–10.5 are on the lower side and may underpredict high floods in many regions.
  • Values significantly different should be justified by local calibration rather than treated as average.


Common Pitfalls:
Using a single C universally without checking basin characteristics; empirical formulas are rough tools.



Final Answer:
11.5

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