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:
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:
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:
Common Pitfalls:
Using a single C universally without checking basin characteristics; empirical formulas are rough tools.
Final Answer:
11.5
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